406 sedan rocker cover oil leak problem

My local garage have been VERY good, but this one has them stumped.
A 406 sedan, the rocker cover did have an oil leak.
During a recent service and recent clean up I said "fix the oil leak"
They "fixed" the oil leak.
It lasted a day, sent it back and more sealent.
Lasted 2 days.
Now it's back. Not alot, but still should not be happening.
There is apparently no gasket for the rocker cover for my 406.

Any thoughts are appriciated.

Cheers,
Tel

 

Easiest way is to cast a silicone gasket in situ.

Clean the rocker cover sealing face of all oil using petrol or other
solvent. Put a film of oil on the mating face.
Use a reputable (e.g. hermatite orange in UK) silicone liquid gasket
compound and place a layer on the rocker box cover.
Fit the cover enough to locate it but don't tighten it.
Allow the gasket to cure.
Lift off the cover to inspect the surface, filling in any gaps.
Fit the cover as normal.

Bob

 

Thanks Bob, I'll pass on the info.

 

Is it possible to see oil trails from the rocker cover or is there a general
film over the whole area. I ask because I have, over the years, had a
number of oil leaks in different cars that gave every impression that it
must be from the rocker box but, in every case, turned out to be the oil
pressure switch leaking.

 

Even the filler cap can cause a leak not fitting

 

Thanks for replying tinkerer,

Well it's going back in for it's third attempt at fixing this. (This
time with Bobs instructions)
There is a trail coming from the rocker cover (Between the first and
second attempt at fixing this the trail moved).
Before the first attempt it was not easily visbile until the engine
was steam cleaned,

 

Thanks Chris,
The filler cap has been checked and it's sealing properly.

 

Ah, well, If there's a trail then that pretty well clinches it. Good luck,
let us know how it works out.

 

so its him thats leaveing all the oil on the roads lol lol

 

I'm trying to stop my own little BP thing from happening. LOL!