[V8] Oil Leak from Heads

[Paul Jager]

I think a large number of oil leaking V8's are actually from the heads.
Initially most people would say the distributor seals etc etc. but I believe
that is not the culprit. When I got this v8 '93 4.2 with 100K Km's on it the
used car sales said the same thing - distributor seals. But the service
record showed new head gaskets at 50K and when I drove it they were still
leaking. The leak got worse to now at 180K it was quite bad, at full rpms
oil press 3-5 bar.

So we torqued the driver's side head and the leak is way way down. Now I
have to do the other side.

We opened up a 928S4 engine yesterday and the oil feed to the heads are at
the corners of the block, near the edges - something like a 1/4" passage
through there. For the V8 this would be rear drivers side and front
passenger. Again I don't think there is quite enough surface for a proper
bullet proof seal in the V8 block. If I were to pull the heads I would use
some sort of compound around that area for extra sealing.

Paul