<VV> Using two block cover gaskets
vairologist at cox.net
Tue Jun 26 13:52:20 EDT 2012
---- Mike McCrae <mmccrae6 at cox.net> wrote:
> You?re not going to like my reply Smitty.....and I?ve done 67 engines
being that?s all I do. Eliminating the gaskets drops the fan a considerable
distance from the top of the shroud and makes it a heck of a lot less
efficient. And that is if you?re using a gauge on a granite slab like we do,
and adhering to the specs offered by clark?s. I believe the term is called
Mike McCrae of ?Corvairs Only?
Smitty says; Mike I respect your right to have an opinion. That is more
than I offer some on this list. Having done so many engines I would suppose
you have changed even more fan bearings, so you have BTDT. When I had my
first fan bearing failure (and not knowing any better) I looked in the shop
manual for advice on how to change it. I found the specifications for fan
bearing upper flange height. (both dimensions) I don't know what Clarks
says and have no interest in that. I made a sheetmetal gage to rest in bolt
holes on each side of the block cover to set the bearing height. It is
accurate to a couple of thousandths of an inch. As you say though it
doesn't compensate for two gaskets or no gaskets. When I read your post I
went to the garage and climbed a ladder and dug into an unopened Gasket set.
Took out a block cover gasket and measured it with a micrometer. It was
.020 thick. That means the fan will be lowered by a whopping .040. (HERE"S
MY OPINION NOW). I don't think that is going to ever have a measurable
effect on engine cooling. Think about that. Something more than the
toasties box cardboard.
Next time I change a bearing I may file away .040 of the under side of my
gage and see if my engine runs cooler.
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