[V8] Retorqueing heads

[Dag Bøsterud]

First of all; the head gasket isn't blown. They're new. They were changed 
because of oil leakage from the right cylinder head. Cylinder heads were 
delivered to an engine shop and refurbished (milled to spec, new valve stem 
seals +++). The engine was leak free for about 200-300 km. The leak is now 
back, but it seems to be a bit smaller. I would not consider
a head gasket with a bit of oil leakage blown.

The head bolts were of course replaced (original manufacturer) along with 
head gaskets (original manufacturer),
and about all other seals you can possibly think of.

My car may be a "high mileage" car (325 000 km / 202 000 miles), but I know 
for a fact that the
engine block was exchanged for a new in Germany in the late 90's, so I would 
suspect the block
to have done about 100 000 miles. I wouldn't say that is a high mileage 
motor.
300 000 miles is a high mileage motor - but I guess we have a different 
definition of that here in Norway, Europe :)

/Dag
92 V8 4.2
202 000 miles


----- Original Message ----- 
From: <QSHIPQ at aol.com>
To: <pjager at telus.net>; <V8 at audifans.com>
Sent: Saturday, May 17, 2008 12:10 AM
Subject: Re: [V8] Retorqueing heads


>
> My first question:  Is the head and the block true?  I'm all up  for
> workarounds, just not familiar with the issue.  But I haven't done a 
> sneak and pray
> head gasket on a v8 either, usually, I've got the head off, and I  always 
> get
> it shaved to spec.  My concern is that this is a high mileage  motor, 
> where the
> head wasn't milled to spec, and its possible that the work  around isn't
> working around anything to do with the flow of oil thru the  head.
>
> Could learn something new too.  That said, the twisted headbolt won't
> accomplish the intended task, it will just stretch more.  If you are 
> indeed  looking
> for more clamping force, that's ARP's forte.  I'm not a fan of  ARP's 
> because
> I believe that when a head gasket needs to blow for exceeding the  limit 
> of
> the stock clamping force, the fastener shouldn't stop it.  I see a  lot of
> warped heads because of this.
>
> Could work like a charm too, I suppose.
>
> SJ
> In a message dated 5/16/2008 4:03:43 P.M. Central Daylight Time,
> pjager at telus.net writes:
>
> For sure  it's not a head bolt problem.
>
> It's a sealing problem. Force of oil  pressure v.s. surface area for the
> seal. There is that small dia. oil pipe  rear drivers, front side 
> passenger
> at the end of the head.
>
> Reducing  the clearance of this gap between head and block, by compressing
> the head  gasket a bit more you reduce but not eliminate the flow. That's
> all. A  workaround we are talking here to make things more liveable.
>
> The head  gasket won't blow and will be fine around all other sealing 
> points.
>
>
>
>
>
>
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