[V8] Retorqueing heads

Dag Bøsterud dag.boesterud at consulgranada.net
Fri May 16 09:55:14 PDT 2008

If that were the case, wouldn't the head gasket blow? The car is leaking oil in small amounts, and it seems that lots of other people have this problem.


92 V8 4.2
202 000 miles
  ----- Original Message ----- 
  From: QSHIPQ at aol.com 
  To: dag.boesterud at consulgranada.net ; V8 at audifans.com 
  Sent: Friday, May 16, 2008 5:25 PM
  Subject: Re: [V8] Retorqueing heads

  I argue you don't have a headbolt torque problem.  The way a stretch bolt works is that it will reach it's tensile strength, then stretch.  If you try to overtorque it, it may stretch more, but more likely it will break.  Those twisted head bolts on the v8 are used on turbo motors putting out a lot more cylinder pressure than a 4.2 v8 will ever.  IME, a properly done head gasket R&R doesn't leak on a v8 motor.  I just don't see overtorquing solving the problem, more likely creating a larger one.  I'd look at the possibility that you have possibly stripped one of the head bolt holes.  I have seen that.

  In a message dated 5/16/2008 10:14:10 A.M. Central Daylight Time, dag.boesterud at consulgranada.net writes:
    As I've explained in my other thread (V8 leaking oil... again... and again..), I've just replaced the head gaskets, along with about every other gasket in the engine.

    The engine was leak free for about 200-300 km, then it started to leak again.
    This is why I'm wondering how you people feel about overtorqueing the heads.
    I've done this to lots of engines, but they never had stretch bolts and the block were made out of cast iron.

    92 V8 4.2
    202 000 miles - not completely leak free...

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