Question about 2002 Moto Guzzi California Stone Metal

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Stone Swing Arm Question

Cleaning my Metal Stone today I noticed some moisture where the small rubber bung fits in the large chromed nut on the swing arm

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  • Anonymous Mar 16, 2014

    I need the size of the spacers that come on your backwheel shaft before the nuts go on to secure the backwheel and keep it intact

  • Anonymous Mar 17, 2014

    Swing arm

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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. ,,,

Posted on Nov 10, 2008

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