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My conflict with final drive gear oil

sir fred said:
OK..hopefully the last. I just talked to the mechanic at my Dealership. He said that the Piaggio site(of which he gets all his info from) states that a refill is 250cc's.
To avoid confusion, the transmission (in American terms) holds 430cc's.

I will stick with the 250cc's that I removed and replaced.

Ride safe..Love my first Guzzi!
Click to expand...

OK - so after 2 years of running the same tires and the same final drive oil. I got around to replacing both this morning and I think I have the definitive answer to the question of oil level (now watch me be wrong !!!). I jacked the bike up on a ATV lift, removed wheel and cosmetic black plastic ring, drained oil into small plastic tub for a few minutes and sucked it all up into a syringe. I measured around 240 cc. There was almost certainly a few cc's left inside so let's call it 250.

Now I measured fresh oil and with fill and level plugs removed, measured (with a syringe) and symphoned in 240cc. Although the wheel was obviously not flat on the ground, as per manual (how the hell do they expect you to do that with wheel removed), I could just see the level of the oil at the bottom of the fill plug. It was not pouring out but it was visible right at the bottom of the plug thread as you look down into it. I squirted a couple of cc's more and could see the level rise slightly up the thread so I guess that's it - 250cc - final answer, no need to phone a friend or ask the audience. By the way, tires were Metzeler ME888's and oil was synthetic 75W90 GL5.
 
I have managed to overfill the CARC (not for a 1400 obviously) by spinning the rear wheel after a fill. Hell, it looks empty as most of the oil is clinging to the gears. Refill, and do it again.

Obviously, this requires a bit of patience, something I lack.
 
Beket said:
And it's critical to follow)
GL-4 is not equal to GL-5
Click to expand...


Did this again this week to coincide with a new tire. 2nd time around I've found a quick rule of thumb for putting in the right amount of oil without measuring it accurately. Squirt it in under moderate pressure via the top hole and a syringe (trying to seal the hole with syringe nozzle to create pressure in the drive). As oiil goes in, this will force air out of the middle/level hole. When the oil "jumps" out of the middle hole all over your knee your oil is at the bottom of the level filler. Worked for me and a visual check confirmed.

At the risk of starting another oil debate, most opinions here suggest that GL5 is fine for the rear.
 
PaulDavies said:
....
At the risk of starting another oil debate, most opinions here suggest that GL5 is fine for the rear.
Click to expand...

With all respect for the voice of "most opinions", I feel that I'm not so smart* as engineers from Mandello del Lario
(*) years of organic chemistry in universities and main business BTW .))

Paul, thanks for sharing your experience!
How's the salmon season?
 
Beket said:
With all respect for the voice of "most opinions", I feel that I'm not so smart* as engineers from Mandello del Lario
(*) years of organic chemistry in universities and main business BTW .))

Paul, thanks for sharing your experience!
How's the salmon season?
Click to expand...

I think it's just that some folks more knowledgable than me have stated that while GL5 is not compatible with the brass and copper that was frequently used in some bikes, MG has not used them for many years so they claim it isn't an issue. That plus the fact that Guzzi literature is notoriously out of date (too much copy/paste perhaps from previous manuals). I even read somewhere that the 1400 has hydraulic adjustments of valves (sorry can't recall where that was, other than it was a thread on this site a couple of years back)

Salmon fishing seems good, judging by the boats on the water although I haven't been out myself (except for the jet ski)
 
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