Gregory Bender

Sump extension installation on V1000 I-Convert

Moto Guzzi V7 Sport, 750 S, 750 S3, 850 T, 850 T3, 850 T3 California, V1000 I-Convert, V1000 G5, 1000 SP, Le Mans, Le Mans II, Le Mans CX 100, Le Mans 1000, 1000 SP III, 1000 S, California II, California III, California 1100, California Jackal, California EV, California EV Touring, California Aluminium, California Titanium, California Special, California Special Sport, California Stone-Metal, California Stone-Touring, California Classic, California Touring, and California Vintage models

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Thanks to Jack Huisinga for sending me this information regarding his installation of a sump extension on his Moto Guzzi V1000 I-Convert. In Jack's own words:

I finally solved my crankcase vent oil spitting problem by installing the sump extender / windage tray from MG Cycle. I got the external filter on the front version instead of the rear location because of interference with the convert converter housing which I assumed would not be worth working around, if that is even possible.

If I had been thinking ahead I would have done the installation at the same time that I replaced the timing chain (only 3 weeks earlier) so that I could have done the modifications to the timing case cover on the bench instead of on the bike. The two pictures show the fit where the lower fins need to be removed so that the external filter can be fitted. The work would have been much easier in the mill than on the bike but it still took less time with a Harbor Freight 3 inch cutoff tool, a Dremmel and a rasp than it would have taken to get the cover off and back on again. I had some heavy plastic sheet screwed and taped in place to make sure the open crankcase was sealed off to keep the chips out.

The sump extender plus the external filter adds about 525 cm2 area for oil cooling, most of which is in the airstream. I also fitted a finned cooler cover for the filter which adds another 310 cm2 directly in the airstream.

Sump extension fit to a Moto Guzzi V1000 I-Convert.
Sump extension fit to a Moto Guzzi V1000 I-Convert.

Photo courtesy of Jack Huisinga.

Sump extension fit to a Moto Guzzi V1000 I-Convert.
Sump extension fit to a Moto Guzzi V1000 I-Convert.

Photo courtesy of Jack Huisinga.

Sump extension fit to a Moto Guzzi V1000 I-Convert.
Sump extension fit to a Moto Guzzi V1000 I-Convert.

Photo courtesy of Jack Huisinga.

My reply to Jack:

FYI, the one with the filter in the rear works very well, too with only very slight filing needed. I used it on my Convert and I am pleased with it.

Where did you happen to find that finned cooler? I assume it is a universal piece meant for any oil filter, but any details would be appreciated. Thanks!

Jack responds:

I may have preferred the rear filter version but without more info I was afraid to confront the interference problem I didn't understand and instead accepted the interference problem I could visualize and knew how to resolve. Most of the time I don't need oil cooling for my use in the Seattle area – an oil heater would probably be more useful – but it can get hot on summer trips on the other side of the mountains or even in slow traffic.

The fins were from an eBay seller who had red and blue anodized as well as bare aluminum, but I think I got the last one of the bare aluminum.

The stock item is 4 inch long and the filter I use is only 2 inch so I split it in half in the lathe with a cutoff tool so I have another blank on the shelf. To finish it I had to mill a wedge out of the top rear to clear the timing cover and I drilled holes in the clamp area for better clamping.

I also found this on the web but it seemed way too pricy for what it might be worth, especially with the risk that it might not be able to be fitted properly.