Notorious oil leak solved

[BartdeBruijn]

Many years I was hunting down an oil leak on the RHS valve cover of my 1969 911T…….

It was difficult to trace down where the oil came from. It always ended up at the bottom exhaust valve cover studs. Drips on the end of the studs as they are the lowest point. And smoking when hitting the heat exchanger…….
As said, turbo cover plates, silicone gaskets, gaskets with the silicone bead.
Whatever I tried it did not really help. The dripping was consistant and did not really increase over the years.

When reading on this forum on leaks from the rocker shafts, I remembered that I have the special conical rocker nuts that take an O-ring, (Not the rs seals). By tightening they expand in the bores and normally seal flawless. Just to be sure I checked the rocker shaft posistions if one was starting to wander. They all looked good position wise, however when I re-torqued them 2 on the RHS of the engine where very loose.

Conclusion after checking and re-torqueing all shafts and 700 km drive, no drips and bone dry!!!

Hope this could be of any help for someone..
Happy days
Cheers,
Bart

[Neil '67 911S]

When reading on this forum on leaks from the rocker shafts, I remembered that I have the special conical rocker nuts that take an O-ring, (Not the rs seals). By tightening they expand in the bores and normally seal flawless. Just to be sure I checked the rocker shaft posistions if one was starting to wander. They all looked good position wise, however when I re-torqued them 2 on the RHS of the engine where very loose..Bart

Hi Bart,

What are these conical rocker nuts with seals that you refer to? Who sells them?

Thanks!

[SFE]

Any pictures of what you did ?

[BartdeBruijn]

Hi Neil,

They are not for sale but made by a friend who is an engine builder. He does not sell them, however I saw something simularr before and will have a look if I can find link.

Cheers,
Bart

[BartdeBruijn]

Nothing special just retorqueing the rocker shaft bolts

[Neil '67 911S]

Hi Neil,

They are not for sale but made by a friend who is an engine builder. He does not sell them, however I saw something simularr before and will have a look if I can find link.

Cheers,
Bart

Hi Bart,

Thanks for the reply. This explains why I've never heard of them.

[BartdeBruijn]

Hi Neil,

Did some search for you and found the mentioned one, simular to what I use ��
https://www.neilbainbridge.com/Produ...ft-Sealing-Kit
Good luck,
Bart

[Neil '67 911S]

Hi Bart,

Many thanks for this link! I see that there would be no need to remove the rockers, which would save hassle and potential mistakes. My rockers seem tight but the 8 mm hex cone end on several feel a bit shaky after the two engine overhauls that I know of.