Gregory Bender

Generator repair - Magneti Marelli

Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models

Created:

Updated:

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Both disassembly and assembly photos are provided on this page. Please also reference Dan Eberhardt's rebuild procedure for Bosch generators. Dan offers many hints and tips that are directly applicable to Magneti Marelli generators.

Disassembly

I had the opportunity to rebuild the Magneti Marelli generator on a V700 project bike for a customer. Here is the disassembly process.

  1. Here it is...the mighty lump of a Magneti Marelli generator...as fit to the V700 and most Ambassador models.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  2. Remove the nut that secures the pulley in place. I used an pneumatic impact wrench and it came off very easily.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  3. Remove the pulley from the shaft. The shaft is not tappered, so the pulley should simply slide off. However, it can be tough at times. Joe Tokarz sent me the following information from his experience:

    I found that a gear puller was not a good choice for me since the pulley is brittle. An expensive lesson.

    Remove the nut and washer as you suggest. Squirt some penetrating oil down the shaft. Let sit for a while. Suspend the generator by the pulley a little above a padded landing place. Have an assistant smack the end of the shaft with the nut on the end with a soft head hammer. Some heat can help too. Once the shaft and pulley hole and key are cleaned of any rust I used a smear of anti-seize and the pulley slips right on and is easy to remove if there is a next time.

    Broken pulley
    Broken pulley

    Photo courtesy of Joe Tokarz.



    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  4. Withdraw the spacer and the Woodruff key.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  5. Remove the two nuts that secure the rear end cap in place.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  6. Withdraw the bolts from the front.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  7. Remove the front plate.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  8. Remove the housing from the front.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  9. Replace the washer and nut on the shaft and support the shaft in a vice as shown. Note: I am not clamping the shaft in the vice, but rather supporting the shaft.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  10. Drive the rear housing off the shaft. The one I rebuilt came off easily. Note the small collection of dried spiders!

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  11. A view of the rear cap. Notice the wavy spring washer. It was originally positioned behind the bearing, at the rear most point of the rear cover, but migrated forward as I drove the rear cap off.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  12. Now it is time to remove the rear bearing from the shaft.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  13. Support the bearing as shown, then drive the shaft out with a drift.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  14. Then remove the washer.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  15. Now turn your attention to the inside of the front plate. Note the wire spring. Remove it with a small screwdriver then withdraw the metal shield.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  16. Drive out the bearing as shown. Note the presence of the metal shield and wavy spring washer on the other side of the bearing, too.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  17. A couple photos of the front bearing assembly.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  18. Remove the wires protruding through the main body.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  19. Remove the screws that secure the field coils to the main body. This can be, by far, the most difficult part of disassembly.
    • Start by giving the head of the screw a good solid smack with a hammer, supporting the inside of course. Then soak the screws with your favorite penetrating oil for at least 24 hours. Heat can also be used, but you'll want to be careful about burning insulation and the coil wrap (if you aren't re-wrapping...I always rewrap).
    • I've had mixed luck using a large Phillips bit from a hand impact screwdriver. The one I have fits nicely in my 12 inch breaker bar. Then I support the main body of the generator in my drill press vice. With the breaker bar in place, I bear down on top of the breaker bar with the drill press, then rotate the breaker bar. Sometimes it works and the screw pops loose. Sometimes the slots in the screw simply shear off. The good news is that universal replacements of the screws used on these generators are readily available. So, if one does foul on you, drill it out and replace it with a new one.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  20. Remove the field coils carefully.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  21. Remove the positioning pin.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

Assembly

Eight years later, I found myself assembling the generator for my project Ambassador. I took these photos.

  1. I re-wrapped the field coils and soldered on new leads.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  2. Here is how the front bearing assembly is put together.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  3. Here is how the rear bearing assembly is fit to the armature.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  4. I applied Glass Cloth Electrical Tape 27 to the inside of the generator body and then fit the field coils in place.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  5. When fitting the field coils in place, I used new field coil screws because the originals were destroyed during disassembly. The bolts that I selected are not perfect replicas of the originals. Therefore, I had to modify them in two ways:
    1. The bolts are too long and will interfere with the rotating the armature. I reduced the length using my bench grinder.
    2. The head of the bolts is too large and too thick. It will sit proud of the generator body and interfere with the generator bracket. I reduced the overall height (and diameter) using my bench grinder.
    I secured the bolts in place using blue Loctite.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Pipe expander. Very inexpensive from any Harbor Freight store. I have used them when replacing field coils in generators. When used during installation they seat the retaining shoes into the coils very well, and when removing the pipe expander will seat the retaining shoes deep enough where the screws can usually be removed without much damage.
    Pipe expander. Very inexpensive from any Harbor Freight store. I have used them when replacing field coils in generators. When used during installation they seat the retaining shoes into the coils very well, and when removing the pipe expander will seat the retaining shoes deep enough where the screws can usually be removed without much damage.

    Photo courtesy of Philip Santora.

    Pipe expander. Very inexpensive from any Harbor Freight store. I have used them when replacing field coils in generators. When used during installation they seat the retaining shoes into the coils very well, and when removing the pipe expander will seat the retaining shoes deep enough where the screws can usually be removed without much damage.
    Pipe expander. Very inexpensive from any Harbor Freight store. I have used them when replacing field coils in generators. When used during installation they seat the retaining shoes into the coils very well, and when removing the pipe expander will seat the retaining shoes deep enough where the screws can usually be removed without much damage.

    Photo courtesy of Philip Santora.

  6. Here is how the DF post is assembled, insulated, etc.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  7. Fit the armature to the rear cover/brush assembly.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  8. Fit the front bearing assembly to the generator body.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  9. Fit the insulating pieces for the D+ post on the rear bearing assembly.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  10. Fit the locating pin to the generator body. I used red Loctite to secure it. I also punched the inner threads in the generator body such that the pin cannot migrate inside the generator. The pin pictured is not the original locating pin. The original threads had been destroyed. I tapped the hole to a larger metric size, then roughly machined a stainless steel bolt to work.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  11. Fit the pulley.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

  12. The completed generator.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.

    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.
    Rebuilding a Magneti Marelli generator as used on Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models.

    Photo courtesy of Gregory Bender.