Topica Loopframe_Guzzi Archive


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

Author: Robert Hawkes

Date: Mar 24, 2002, 5:41 PM

Post ID: 1709919472


I think Tom is correct. When loosening engine fastners loosen them all a
little at a time. When torquing them tight do so step-wise; 15, 20, 27ft
lbs. Make sure you tighten in the sequence shown in the manual. Bob
----- Original Message -----
From: Tom Bowes <kk-@comcast.net>
To: <Loopfram-@topica.com>
Sent: Sunday, March 24, 2002 10:38 AM
Subject: RE: How to torque the heads....CORRECTLY!


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David,

"Back them off"? I prefer the term "break them loose". Sure, you turn
them in the reverse direction, but only enough to free up the fasteners,
and then proceed with tightening to spec. Probably the biggest concern
with torquing parts on an aluminum engine is doing it in multiple
passes, and not trying to get everyhing tightened up in one swoop. This
is a bit trickier on an engine that has already been run in because
there are no guarantees that they (the nuts) will all be starting with
the same initial torque. Generally, I back off all of the stud nuts just
enough to get them to move, and then retorque to 15, 25, and then 30
ft/lbs, being sure to use a cross-tightening pattern. The big thing is
to be sure that the nuts actually move when you turn them. If not,
you're only twisting the stud which will create problems, either
immediately, or in the future.

Also, I never apply scotch, single malt or otherwise, to either myself
or the bike during the retorquing procedure. This is due to it's habit
of introducing operator error and clouding one's judgement, thus
contributing to premature gasket and/or engine failure.

David Szenasy wrote:
 A local motorcycle shop told
me to back all the bolts off, then re-torque. I was told by a Guzzi
owner
that if I do that on the old bikes, they will start to leak. What is
the
best way to go about this? Since putting new cylinder kits on the bike,
I
torqued the heads by backing each nut off and re-torquing one at a time.

Does it really matter?

Thanks,
David Szenasy



Tom

Shelby Township, MI

Early '70 Ambo
1980 G5
1982 V50III

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