Hi all,
how do i stop an oil leak on a rocker cover,i fitted new gasket and it's a new cover aswell.
But i can't stop it from leaking.
Thanks Dave..

If the cover it tightned too much, they tend to bend and start leaking..
best option is to put a new one on, not tightned too much. Best is with a torque wrench (how much anyone?)..

I usualy first tighten te nut uo by hand, untill I cant move the cover by hand, and then 1/2 a turn with the good old 12mm spanner..

Thanks Tom,it is a new cover and i have deffinatly not over tightened it,but the dam thing will not stop leaking.
Dave.

Hardyboater,
which type of gasket did you use, the 'old style' rubber ones or the newer type which snap if bent?
It doesn't always hold true, but in this case the older type are better...

Maybe worth checking that there's no damage on the mating surface of the cylinder head.

p.s. Don't forget to glue the gaskets onto the covers with Evostik or similar, then use only a light coating of oil or grease on the face which contacts the cylinder head.
One of my pet hates is finding a gasket which has had gasket goo plastered onto both sides, almost as bad as those which are chucked in loose.

Note that the gaskets should not need changing every time the rocker covers are removed.
This suggestion seems to originate from the same sources which advocate changing spark plugs and leads about every 3,000 miles.



Tom,
I'd agree that over-tightening can cause problems, but so can under-tightening.
About 2 turns from finger tight will be closer to the mark, going on this test...

ken



1 turn of the nut gives 2.6 Nm, 0.25 kgf m by slcchassis, on Flickr


2 turns of the nut gives 5.0 Nm., 0.5 kgf m. by slcchassis, on Flickr

Thanks,it is the new type gasket.Will give it another try.

Dave.