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Guzzi is one great bike shy the gear box whine, I've worked on a handful of Guzzi and almost all of them have it. It does seem to get louder as the bike gets older. Keep a GOOD oil in it and shouldnt have any problems. Amsoil makes some of the best motorcycle oil i have found and that would be what i would run in it. During your next oil change check out the gears while you have the pan off to change your oil filter. Everything is easy to see and look at. If there is anything else i can help with or if you have any more questions please feel free to contact me M. Woodring
Assuming the drive chain and sprockets are in good condition.(check these first)
This sounds like and internal gearbox problem, a bearing has collapsed or a tooth has broken of a gear.
Riding it like this will cause more damage. The gear box will likely need to be stripped
but no there was definitely a loud whirring noise in 5th gear sort of like a very noisy bearing. The bike still ran in 5th but it was definately becomming increasingly noisy. When I changed down to 4th the noise went away even if I slowed to the rev range I had been cruising in 5th. Same story with the other gears, but the noise returned with a vengence in 5th. Needless to say I rode the rest of the way home in avoiding 5th.
Any ideas? I suppose I'm looking at a gearbox strip? Could the noise be anything else? ,Had a similar issue with my 1000S, only 5th gear was noisy - a sound like a dry bearing -other gears were silent. Bike had done 70,000kms and serviced correctly.
Had Barry from IME check it out. Turned out to be both 5th gears needed replacing - looked like the case hardening on the gear faces was eroding and pitting.
New gears went in and the box properly shimmed and happy to say 6000 kms later all still silent in the gearbox department. Plus the added benefit of slicker gear changes.,,,
on the right-hand side. Extracted the bung and found some grey fluid in the tube smelling like gear oil. Checked the LHS but nothing there. No indication of a leak anywhere and no drips. Had a look in Guzziology but couldn't find anything relevant.
Any explanation?1.) Don't drop the oil level in the gearbox. It won't make a skerrick of difference to the weep and there is a risk that too little oil will damage bearings and pinnions.
2.) The most likely source of the oil is not the gearbox but the bevelbox. The crownwheel iof the box acts as a centrifugal pump picking up oil in the biox and throwing it around. Some of this oil ends up being flung at the pinion bearings and works it's way through and up the swingarm. This is especially true on models that have either had their suspension lowered or are thrashed regularly for long distances heavily laden. It can eventually work it's way past the splines at the back of the UJ where it meets the shaft and then pools in the UJ housing or is flung around in a spray as the UJ spins and whips it up! When this happens some of it may well be ejected up the stub axle with the result that it will appear at the bung.
3.) If it *is* the gearbox leaking it is most likely NOT to be the seal but the o-ring beneath the speedo drive support washer on the output shaft that is leaking. The gearbox ISN'T pressurised in any real way expansion of the contents is taken care of by venting expanded air via a breather on the back of the box. Any leakage past either the seal or the o-ring will generally be very minor unless something serious has happened like the cage of the output shaft bearing has collapsed and punched it's way past the seal. If you check the gearboxl regularly and it isn't loosing more than 30-40ml between changes it's nothing to worry about. Loss out of the output shaft seal or o-ring simply ensures that the seals on the caps of the UJ trunnions will remain moist and soft and help prevent the bearings inside the caps from drying out. If you're losing more than that, (And it will end up in the bevelbox eventually after working it's way past splines and bearings.) it will show up as the bevelbox being grossly over-full when you remove the level inspection plug from it and a blurt of oil will run out.
The fact that you mention that it is a 'Grey' fluid makes me think that it is most likely to be oil from the bevelbox as this should have moly in it and this will present as a 'Grey' colour in the oil as it seeps out.
Unless you are experiencing any other *worrisome* symptoms I'd simply seal up tghe bung with a dab of silicone or some such to prevent the weepage and check the gearox and bevelbox oil levels regularaly for a few weeks to make sure you aren't getting a gross re-distribution of oil from gearbox to bevelbox. If it all checks out OK? Stop worrying. ,,,
Having the engine in pieces for new clutch and chain and fixing the gearbox I guess I should really check out the main bearings and the oil pump while at it.
So I tried to wiggle the oil pump shaft and there is a slight radial play but I guess that is OK. I removed the pump and all looked good. Some scoring to the cases but really only cosmetic as far as I can tell. Please tell me if I'm wrong.
Now to the crank shaft. With the clutch and the cam chain sprocket removed I have an axial play of some 1.5 mm. That is OK no? I figure it will be fixed in that axis when the rest is in place. I can't feel any radial play at all, front or back. Is that it and all is fine?
Or is there some other good way to check this? Should I even remove them and look at the bearing surface? Seems easy enough right now but it's only 55.000 kms,Typically with reciprocating motors if you have a concern it would be normal to lift a cap of a main and a big end to carry out an inspection of the bearing half and the journal. The highest load/wear is on the bottom and there is no need to inspect the top half unless you find something wrong. As a rule of thumb if all is OK refit the old shells.
My advice would be unless you suspect a problem or like looking into things leave it alone.,,,