[V8] Retorqueing heads
QSHIPQ at aol.com
QSHIPQ at aol.com
Fri May 16 07:09:00 PDT 2008
I'm late too... Here's what I'd try in the cheap sneak and pray.
Buy a set of new head bolts. Pull each bolt out 1 at a time, and replace
with a new one and torque to factory spec.
Head bolts are stretch bolts, I measured a set once, they stretch something
in the hood of 5mm+ torqued. Once heat cycled, your risk of snapping one
increases exponentially, so does the risk of ruining the head, and/or ruining
the block. Chances are really good you need to go in and replace the head
gasket. The *only* other way I'd consider doing this is to do 5 hail mary's, and
replace the bolts 1 at a time (start with the center and follow the bolt
replacement as you would the torque procedure) and torque each completely to
final spec, move on to the next. Good luck....
HTH and my .02
In a message dated 5/16/2008 8:24:25 A.M. Central Daylight Time,
David.Coleman at blackrock.com writes:
Just out of curiosity, as I haven't been following this thread...
Have you ever torqued down a V8 cylinder head? The specs are massive, and
going that last factory-spec 1/4 turn as specified in the Bentley is
harrowing, to me at least. I felt like I was either going to snap the wrench, the
bolt, or spin the whole car around.
I guess before worrying about *over* torquing it, consider two things:
- check to make sure it's in spec first..
- perhaps get a new set of head bolts and replace them all, rather than
retorquing the existing ones (which are supposed to be replaced, not reused).
Again, I'm late to the party here, so please don't act on my two cents alone.
> -----Original Message-----
> From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf Of
> Dag Bøsterud
> Sent: Friday, May 16, 2008 9:16 AM
> To: V8 at audifans.com
> Subject: [V8] Retorqueing heads
> If I were to torque the cylinder heads in my 92 V8 4.2 a bit over the
> try and stop the ever-so-leaking right cylinder head...
> Could I try to turn the bolts 1/8 of a turn? 1/4?
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