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2020 V85TT Rear Transmission Leaking

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SIR REAL ED:

--- Quote from: timonbik on August 12, 2026, 06:36:01 PM ---If one follows Guzzi's line of thinking why put any lube in at all that way there would be no chance of leakage.  The designers/engineers originally called for 180 ml, then it was reduced to 160 now  130.  Something's rotten in Denmark me thinks

--- End quote ---

The difference between the recommended oil volumes could be as simple as a typo in the original specified amount.  Followed by another change because there is some residual oil that does not drain.  Never underestimate the human capacity for miscommunication.

If you reduce the volume of oil, and the leaking stops, I would say "Problem solved!"

Vagrant:
With that many miles on it the odds are the seal or vent has failed. Checking the vent is free and complete draining and refilling with 130cc is basically free also. It's worth a try.

SIR REAL ED:

--- Quote from: SIR REAL ED on August 13, 2026, 02:08:43 PM ---The difference between the recommended oil volumes could be as simple as a typo in the original specified amount.  Followed by another change because there is some residual oil that does not drain.  Never underestimate the human capacity for miscommunication.

If you reduce the volume of oil, and the leaking stops, I would say "Problem solved!"

--- End quote ---

I just noticed.... 8, 6, & 3 look remarkably similar don't they?  I'd bet money misreading or poor transcribing is a factor.

JHBettsSr:

--- Quote from: yrunvs on August 12, 2026, 07:41:24 PM ---It is a little bit of a mystery as to the correct amount of oil for the pre E5+ model v85tt's. The E5+ manual states to refill with 130cc but I can find nowhere this amount for the E5 everything I find states 160cc's is the revised amount from180cc. There is a possibility that the final drives are different in some way???

--- End quote ---

Good question. According to the AF1 OEM parts catalog the "Transmission Complete" part number did change with the E5+.
E4 Early 2B0042715
E4 Late  2B0068275
E5   2B0068275
E5+ 2B013050

Dr. Enzo Toma:
If you check the individual part changes, you may find that the breather and some other parts were revised as was the case for the V7, but I doubt the physical volume the pumpkin can hold changed - just the spec when Piaggio got enough reports that 160cc was causing it to leak. I recently had my V7 850 in for service and they changed the final drive oil without it having been on the maintenance schedule... talked with them and learned that the spec they have is still 160cc even downloading the PDF manual right then from Piaggio/Moto Guzzi to check it for any updates. So to my knowledge, it was overfilled, but to all available documentation to them, 160cc is still the spec and no TSB is issued to say otherwise.

I would have drained and filled it again but had to hit the road and figured I'd let it leak if it's going to leak, at the point the final drive leaking on my V7 is like a Harley leaking oil, you become worried when it doesn't. Around town and interstate - no problem. Then earlier today I rode Spearfish Canyon in SD and next gas stop it had leaked all over the rear wheel again. Wiped it down, rode mostly straight and interstate roads after that, no more leak. My impression is that the canyon riding had some influence on the leak since it otherwise hadn't lost oil. Maybe something to do with sustained lean angle? Just a guess. Anyway, now I am back home and have some time. I plan to drain and fill to 130cc, and install the plug marked 130cc max before the Colorado Moto Guzzi rally in Hotchkiss later this month so it's not oiling the rear tire again in the mountains.

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