Yesterday, by pure coincidence, I happened to read an article relating to
this. Actually, the article was about metal fatigue in light airoplanes,
but a significant part of it dealt with metal fatigue in cylinder heads
caused by incorrectly torqued studs, and I figure that most of the stuff
that applies to piston engines in aircraft also applies to our cars, so
here's the URL:
I'd be interested to hear from someone who knows more than me, how relevant
they think this article is. (Ok, so I guess the bit about leaking oil from
the propeller hub doesn't apply to LBCs.....)
Date: Tue, 19 Sep 2000 22:12:47 -0700
From: "John Weber" <firstname.lastname@example.org>
Subject: cylinder head
Joe, et al:
Yesterday, when I dropped my head off for rebuild, the mechanic reminded me
to torque the head immediately after the engine warms up...and to do it
again at about 500 miles. This agrees with this list, plus agreeing with
the Haynes book in the engine rebuild section.
They also said to torque it to 50 vice 46. Any thoughts on this? I was
under the impression that too much torque was not good.
And on another note, I remember a thread where the little pieces of wood
the front? plate were needed. BPNW includes them in their engine gasket
kit. NFI on my end. Just noted that they were in the kit when I unboxed
the other day.