primary chaincase gasket

Captain B · Jul 4, 2009

Do you need a new primary chaincase gasket everytime you open it up? I'm going to order a new gasket I guess. I hear there is also some kind of seal that should be added to keep the gearbox from leaking into the clutch, or some such thing. I'd like to service the clutch discs and am wondering what to do once I'm in there. I havn't had it apaert before and it hasn't been opened up in 20 years. Any gizmos I should buy before opening it? I'd like to make it a quick operation so as not to lose drive time.

swooshdave · Jul 4, 2009

Captain B said:
Do you need a new primary chaincase gasket everytime you open it up? I'm going to order a new gasket I guess. I hear there is also some kind of seal that should be added to keep the gearbox from leaking into the clutch, or some such thing. I'd like to service the clutch discs and am wondering what to do once I'm in there. I havn't had it apaert before and it hasn't been opened up in 20 years. Any gizmos I should buy before opening it? I'd like to make it a quick operation so as not to lose drive time.

Isn't that the big rubber o-ring? Don't replace it unless it's leaking.

cash · Jul 4, 2009

Ben,
The first and most important thing to buy is a clutch diaphram spring compressor.

Now if you're careful you won't need a new gasket if its a Mk3 or an O ring if its one of the others. However I'd still get one just incase. There's a lip seal that's hidden behind the alternator rotor, and while it's in bits fit a pushrod seal.

Best of luck,
Cash

chris plant · Jul 4, 2009

hi captain,when you get it apart check the clutch bearing as well and maybe a new rubber gromet for the alternator wires

L.A.B. · Jul 4, 2009

Captain B said:
I hear there is also some kind of seal that should be added to keep the gearbox from leaking into the clutch, or some such thing.

http://atlanticgreen.com/store.htm "COMMANDO clutch rod seal".

plj850 · Jul 4, 2009

Captain B said:
Do you need a new primary chaincase gasket everytime you open it up? I'm going to order a new gasket I guess. I hear there is also some kind of seal that should be added to keep the gearbox from leaking into the clutch, or some such thing. I'd like to service the clutch discs and am wondering what to do once I'm in there. I havn't had it apaert before and it hasn't been opened up in 20 years. Any gizmos I should buy before opening it? I'd like to make it a quick operation so as not to lose drive time.

You might order a new clutch tab washer just in case the old one is on its last legs..

Captain B · Jul 4, 2009

I have a clutch spring tool. Which bearing is better? The sealed, or regular? the bike only has 4600 miles on it so, i'll probably skip on the bearing this time, but just for future reference>

chris plant · Jul 4, 2009

hi captain,if you,re running wet the regular bearing should be ok, if you,re going dry with a belt drive i would fit a sealed one , with only 4600 miles on it i would,nt change it either but check its condition anyway

L.A.B. · Jul 4, 2009

Captain B said:
I have a clutch spring tool. Which bearing is better? The sealed, or regular? the bike only has 4600 miles on it so, i'll probably skip on the bearing this time, but just for future reference>

Just be aware that the clutch bearing is a special low clearance bearing. If you fit a standard clearance bearing, then the clutch basket will probably rock more than it did with the old bearing!

maylar · Jul 5, 2009

I usually keep a spare rubber o-ring primary gasket on hand. They last a long time but eventually flatten out. I also put a light bead of clear RTV on the outer cover mating surface.

L.A.B. said:
Just be aware that the clutch bearing is a special low clearance bearing. If you fit a standard clearance bearing, then the clutch basket will probably rock more than it did with the old bearing!

LAB you should mention that to the guy on BritBike who had questions about clutch wobble.

primary chaincase gasket

Captain B

swooshdave

cash

chris plant

L.A.B.

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plj850

Captain B

chris plant

L.A.B.

Moderator

maylar

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