<VV> Top Cover Gaskets/ Lose Screws
vairologist at cox.net
Tue Jun 26 00:42:59 EDT 2012
Sent from my Windows Phone
From: Clark Hartzel
Subject: <VV> Top cover gaskets/loose screws Another reason screws loosen up
is cover and block are aluminum and the baffle is steel. They expand and
contract at different rates causing the gasket surface to "walk" back and
forth. I never could understand how aluminum heads can work on an iron V8
block. Lots of movement there!
Maybe we should make an aluminum baffle plate.
Smitty Says; Sent from my 15 year old Dell PC. Just for the record, the
use of screws when talking of bolts offends me.
Every time the subject of the coefficient of expansion difference between
the Crankcase baffle and the block and the block cover comes up, I hear
about how much slipping and sliding is going on between them. I say bull
feathers. That plate is not made of glass. It has ductility. It may not
like it much but it is forced to stretch and shrink with the materials it is
sandwiched between. Like I have said before. I haven't used gaskets there
for better than 20 years. I mill file both sides of the steel plate to make
sure it is perfectly flat and then with the thinnest coat possible I apply
RTV to both sides. Again I say, I have never had a leak there. But then I
properly torque the bolts. It is all I can do to keep from slipping into
sailor profanity when people talk about the gaskets allowing the pan to
slip. Anyone who has worked more than a few engines has run into the ones
where the previous assembler liberally glued on the gaskets with Permatex
two and you had to all but break the casting to get it loose and then take a
chisel to the residue of the gaskets to get the crap off. Where was the
slippage in that. How many of you are aware that there is a difference
between Early and Late baffle pans. The Lates are considerable thicker.
Why is that? The general had a surplus of thicker metal? I think not. I
haven't turned out engines like Claypool or Sedman or Helt, but I have done
my share. I have found enough Early pans with cracks in them to believe
that they simply couldn't keep up with the stress of the growing and
shrinking aluminum, so they made them thicker to handle the stress.
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