Topica Loopframe_Guzzi Archive


Subject: RE: How to torque the heads....CORRECTLY!

Author: murp-@aol.com

Date: Mar 27, 2002, 5:46 PM

Post ID: 1709940946


Gary,
I have not said that every nut or bolt must be backed off. It is not
necessary to back off at all so long as the nut or bolt being torqued
turns before the wrench goes 'click' (if you have one that goes
'click'). If the nut being torqued does not turn before the wrench goes
off, then it should be backed off enough that it will turn clockwise
before the wrench setting is reached. Enough can be as little as 10
degrees for instance, as long as the nut will turn clockwise before the
torque wrench setting is reached, and I would not describe this as
'loosening'. This is probably different to what the Toyota guys were
referring to in their advisory. Making sure that the bolt turns is the
only way that you will know that the torque wrench setting is accurate.
From what I've heard on the list, a lot of people don't bother with
this, and have had no problems. This is fine, but they should also know
that if they torque a bolt, and the wrench goes 'click' before the bolt
turns, then it is not possible to tell the value to which that bolt has
been torqued.
Brian

Gary Cheek wrote:
 The following from Toyota service advisory . VERBATIM:

"NEVER loosen the bolts before you torque them. This is not a good idea.

This will cause damage to the head gasket which is already compressed
and not in favor of recompressing (HKS headgaskets are, but stocks
aren't). Besides that, it screws up the whole torque order, so you will
put too much stress on the head as well!"







com wrote:
 Bob,
Thanks for the support. Hey, I just tried to explain the theory
behind the recommendation (to back off before torquing) because someone
asked for the theory behid it. I wasn't expecting the response from
those list members who also belong to the Flat Earth Society (I'm glad I


can hide behind this computer!).
Brian
'74 T3
'76 & '78 T3's


Robert Hawkes wrote:
 Brian the Brain,
That's the best explanation of this technique I have ever come across.
Nice! Bob
----- Original Message -----
From: <murp-@aol.com>
To: <Loopfram-@topica.com>
Sent: Monday, March 25, 2002 10:48 PM
Subject: RE: How to torque the heads....CORRECTLY!


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Tim Crump wrote:
 
 Never could figure out why you would loosen heads to tighten them,what
is
the
THEROY behind this.Mark


.....it's kinda like a rolling start......lets you build up a little
speed.........

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