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Valve Stem Seals
Posted: Mon Nov 13, 2006 5:05 pm
by peaky
Hi Guys! I have a 78 Darmah SD and am doing the desmo adjustments. Last time (2000 miles ago) I replaced the valve stem seals. What is the interval for these things? Should I replace them everytime? Thanks!
seals
Posted: Tue Nov 14, 2006 10:20 am
by BevHevSteve
If they start leaking replace them. They should last a *long* time. You could replace them at each valve adjust but it doesn;t seem required to do so.
Posted: Wed Mar 24, 2010 7:34 pm
by toomuch
Where are the valve seals ?
I took off the valve covers on a 1978 Darmah head and a 1980 SS Darmah for comparison I sure can't see any seals.
The book shows an o ring type fitted.
Any thoughts ?
S
Posted: Thu Mar 25, 2010 2:46 am
by Geoff
Depends on head configuration, but simple O ring seal in a groove cut in the guide was the earlier practice, yes. Effective until it hardens. You have to have a lot of wear before guide sealing becomes a significant issue.
Regards
Geoff
Posted: Thu Mar 25, 2010 11:08 am
by toomuch
Thanks for the relpy Geoff !
Would I be able to see the o ring with the valve covers off ?
Cheers
Serge
Posted: Thu Mar 25, 2010 11:15 am
by Geoff
No; the O ring is about 1.5cm down in the guide from the top. If you have hte vlave out, yes you can see it.
Posted: Thu Mar 25, 2010 11:25 am
by toomuch
Bingo !
Thanks again Geoff. Have a good one.
Serge
Posted: Sat Mar 27, 2010 11:56 am
by lomax
So, I understand there is no chance to replace that o-ring without pulling out the valve !??
I guess I have to replace, because after 13 years of sleeping the engine smokes a little from the horizontal cylinder......
cheers
Joe