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Re: Air compressor head bolts

To: "'Shop Talk'" <>
Subject: Re: Air compressor head bolts
From: "Bob Spidell" <>
Date: Tue, 13 Jul 2004 07:36:51 -0700

There are several aluminum components--shocks, carbs, thermo housting--on
my Austin-Healey 3000.  I have had success using hardened ("grade 8") washers
under the bolt heads to securely "clamp" the aluminum component (especially the
shocks, which are known to work loose).  I don't believe in using lockwashers,
because they dig into the aluminum and can loosen.

If it's a critical component--like the shocks, which in the front form part of 
suspension--I use blue Loctite on the bolts and torque according to bolt size.

Bob Spidell         San Jose, CA
'67 Austin-Healey 3000             '56 Austin-Healey 100M

----- Original Message ----- 
From: "Larry list account" <>
To: "'Shop Talk'" <>
Sent: Monday, July 12, 2004 11:49 PM
Subject: Air compressor head bolts

> I had to replace the head gasket on my air compressor.  The head is
> aluminum, as is the block.  The bolts are graded bolts.  They appear to be
> grade 5 (three radiating marks and one triangle).  
> Here's the questions.
> Any idea on the torque spec?
> How about washers for the bolts.  Seems that tightening the bolts against
> the aluminum head without washers is wrong?  Thoughts?
> Thanks in advance,
> Larry Hoy

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