Oil Filler Cap.

[Mike J]

Tracing leaks again. Noted a seepage from below the filler cap on the cam cover. Due to wear when the cap is turned fully clockwise to locate, the down pressure isn't as great hence the leak. I have set it just before it locates (more down pressure) no leak. How can this be repaired. or is there a thicker cork gasket to go inside the filler cap. Mike

[new to this]

You can buy the cork gasket,try replacing yours,there very thin when old

Dave

[marshman]

As Dave says the cork gaskets do get very thin with age. It is also possible that the springy prongs (can't think of a better description!) have been over stressed at some point. Have you tried bending them in a bit to hold the cap tighter? If you still have problems after sourcing as new cork gasket you could always try fitting two gaskets to give you greater thickness. Also worth noting increased crankcase pressure - caused by a worn engine or partially blocked breather system etc. can give rise to more seepage of oil from lots of places.

Roger

[jbuckl]

The cork gasket was unavailable for a while, although currently I believe its available.

When it wasn't available, I made one from neoprene sheet, which was either 2mm or 2.4mm.

[Guest]

Mike, new cork gasket fixed that for me

Jason

[Mike J]

Many thanks all. I have tried fitting a new gasket. Still leaks. Just wondering now if the joint between the cam cover and the "tube" onto which the cap fits, is faulty. More talc. In any case I thought there was supposed to be negative pressure under the cam cover.

[davidf]

Many thanks all. I have tried fitting a new gasket. Still leaks. Just wondering now if the joint between the cam cover and the "tube" onto which the cap fits, is faulty. More talc. In any case I thought there was supposed to be negative pressure under the cam cover.

it is under negative pressure. However, I think capillary action beats negative pressure; you can get leaks from the cork gasket of the cam covers, yet they ought to be drawing air in. But the gaps are tiny, so I think it is capillary action.

[KOY 23]

Many thanks all. I have tried fitting a new gasket. Still leaks. Just wondering now if the joint between the cam cover and the "tube" onto which the cap fits, is faulty. More talc. In any case I thought there was supposed to be negative pressure under the cam cover.

You are right if you have standard carbs but not if you have an aftermarket conversion. It's one of the side effects that affects many cars.