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Joined: Aug 2007
Posts: 241
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Aug 2007
Posts: 241 |
Rebuilt the carb for my '49 and now re-installing it. The old carb to manifold gasket looks and feels like it is metal... when I try to pry it up, it just crumbles. I can cut into it with a box cutter and the scar is shiny like metal. I believe it is actually a gasket because it has the word 'TOP' printed in yellow on it, so it's not part of the manifold (the top of the manifold is obvious but not the 'top' of a gasket). I'm having a bear of a time getting it off, and I don't want to ruin anything.
Any tips would be greatly appreciated!
Lee Prairie
"It ain't what a man don't know that bothers me, it's what he knows that just aint so", Will Rogers
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Joined: Nov 2001
Posts: 29,863
Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
Joined: Nov 2001
Posts: 29,863 |
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
First off the factory did not install a gasket under the carburetor. The carb. sat directly on the insulator block. The insulator for 1949 would have been for a Carter carb. and would not have had the TOP printed on it. The insulator for a 1950 and up would be for a Rochester and would have the word TOP printed on it. In the later years the later insulator was sold for replacement on the 1949 and previous engines.
If infact it is a Rocheser insulator (which is pefectly OK to use) it will have four little notches on the inner surface cutting into the bore. These are to index the vacuum port under the base of a Rochester to provide vacuum to the power piston.
Some of the carb. kits did come with an asbestos/metal type gasket but they are not necessary and I never install them
What make of carburetor is on your engine???????????
Gene Schneider
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Joined: Aug 2007
Posts: 241
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Aug 2007
Posts: 241 |
Thanks guys - the engine serial number has the HAA prefix which is supposed to be a 1950 engine. The carb is a Rochester "B" downdraft carb.
I have made some gouges in this 'insulator' if that's what it is... so, I should stop trying to get it off, get some gasket maker stuff and use it in conjunction with a modern carb-to-manifold gasket (?)
Also, I can't see a seam or separation even when looking into the manifold.
Lee Prairie
Last edited by Lee Prairie; 04/03/09 05:52 PM.
"It ain't what a man don't know that bothers me, it's what he knows that just aint so", Will Rogers
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
There may be paint and dirt covering the "seam""......The insulator is made from a hard baklite. Try attaching a magnet to it.
My suggestion would be to get rid of the 60 year old insulator and order a new one. Its common to find them cracked due to old age.
Other than that forget about the gasket, just have a clean surface. The groves in it will not hurt as long as they do not run from the inner opening all the way out to the outer edge.
Chevrolet did it with no gasket and it worked fine.
Gene Schneider
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