Subject: RE: My transmission
Author: Greg Bender
Date: May 17, 2005, 6:46 AM
Post ID: 1718878840
Hi Ted,
Here are my thoughts:
1. I've used two methods to remove the nut on the output shaft of the
transmission: (1) Get the special tool from MG Cycle that holds the
clutch input hub and keeps it from rotating. Then, with the transmission
in gear, remove the nut. (2) Get a giant pipe wrench that will fit on
the clutch input hub. Carefuly protect the clutch input hub from damage
with wood, rubber, etc. Then, with the transmission in gear, remove the
nut. The nut itself is very narrow and you may want to grind a bit off
the end of a 27mm deep well socket so that you get a full bite (the
bottoms of sockets are usually rounded a little to aid with getting the
socket over the nut/bolt). Just be sure to dress it a little so it
doesn't destroy your seal (more important on assembly than
dissassembly).
2. The offset shift adjuster - John Ulrich thinks you are referring to
the Shift Offset Bracket (SOB) made by Stephen Brenton. I think you may
be referring to the shift adjustment nut located near the shift output
shaft. If it is a large flat-tip screwdriver-headed bolt with a lock
nut, then - unfortunately - I am correct. If you've removed it, then you
will have to take the back cover off of the 5 speed transmission to
reinstall it correctly. As you've already noted, the business end of the
adjuster is offset. Normally, it lives between the ends of the shift
return spring. See here:
http://www.thisoldtractor.com/gtbender/loopframe.htm#transmission_pre-selector_shaft_leak_repair_(4_speeds)
http://www.thisoldtractor.com/gtbender/mg_images/shift_return_spring.gif
3. Whether to dive into the transmission or not...Of course, the end
decision is yours and may depend more on your available time than your
ambition. But, here is MY OPINION: Guzzi 4 and 5 speed transmissions of
our ilk ARE VERY SIMPLE! Yes, you can do some *rather* sophisticated
things inside there for racing purposes, but, replacing bearings,
o-rings, seals, shimming it up properly, and giving everything the
once-over is not difficult. For some reason, I think there is this
notion that transmissions are very complex. And, I think many non-Guzzi
transmissions probably are complex. But we are blessed with simple
transmissions. Don't be afraid of them! All you need are the Pete Roper
articles, perhaps my first-timer article, and a few not-too-special
tools. Add to this a large, clean workbench that you can spread things
out on. If you've got a digital camera, don't be afraid to use it. The
biggesting thing is making sure that you put things back together in the
right order. If you have any questions, just ask.
If you don't have time, you may want to consider shipping it to someone
like John Schwartz in Hesperia, CA. He's been working on these things
for decades and is loaded with valuable information about all things
Guzzi - especially transmissions and rear drives. Plus, you won't meet a
nicer guy. If you want his contact information, just contact me off
list.
Well, I hope my ranting is at least a little useful...just remember that
it comes from someone who isn't afraid to take apart anything!
Ted Ward wrote:
Thanks for the input Greg. I did use the bendy tab but I guess I didn't bend it enough or something. I still have the round nut so I guess I'll try and get it back on. That reminds me, how to you remove the nut from the output gear? I'm not sure how to prevent the shaft from spinning while still being able to get at the nut. I ordered a new throwout bearing and some shims. I still haven't decided whether or not to shim. I REALLY don't want to screw with the transmission internals and put it all back together and realize I messed something up, but on the other hand, I don't want to put it back in half done. My transmission magnetic plug had a good size chunk of superfine metal shavings on it last time I took it out so... Maybe I should open it up. What's the deal with that offset shift adjuster deal on the back of the 5 speed? I took it off thinking it was some sort of drain and now I'm not sure what to do with it. I'm finally gonna order Guzziology this week. Ted Ward ----- Original Message ----- From: "Greg Bender" <gr-@thisoldtractor.com> Hi Ted, Hmmm...did you use the little bendy-tabs to prevent the nut from backing out when you installed it? I'd be tempted to go back to using the ring nut. The little throwout bearing is not a sealed unit...it is open but the needles should remain caged (as you are now finding out). If you can find all the little pieces and are certain that nothing has gone into the transmission bearing, then you are probably okay. Personally, since you have the transmssion already out, I would be very tempted to open it up, check all the bearings, replace the shift return spring, replace the o-rings, and shim it up good 'n proper. Pete Roper has a set of very good instructions and I have a little first-timers perspective on my website. http://www.thisoldtractor.com/gtbender/loopframe.htm#transmission_clunk_fix_(shimming_the_shift_drum) |
Regards,
Greg Bender
1971 Ambassador
2000 Quota
http://www.thisoldtractor.com/gtbender
Florida MGNOC website
http://www.thisoldtractor.com/fl_mgnoc
Minnesota MGNOC website
http://www.thisoldtractor.com/mn_mgnoc