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post #1 of 6 Old 08-06-2013, 08:12 PM Thread Starter
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intake manifold gasket question...

I have an Onan b43m engine, I need to replace the intake manifold gaskets, found all the part numbers, except for the gasket for the two halves of the manifold itself. Any one familiar with this?

I found a part number on the manifold 170 2968

Last edited by HollyOnan; 08-06-2013 at 08:58 PM.
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post #2 of 6 Old 08-06-2013, 09:21 PM
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Re: intake manifold gasket question...

holly
what you found is a cast #.
there is also a number on the bottom half.
there is NO gaskt. between the two halves.
it is some sort of sealer.
why do you think you need one?
thank you. boomer
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post #3 of 6 Old 08-07-2013, 05:35 PM Thread Starter
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Re: intake manifold gasket question...

I'm having carb issues, I re-built the carb last weekend, but I didn't have a new gasket to put between the carb & manifold, or between manifold & block. So I settled for not taking the carb off the manifold & using a gasket seal out of a tube for the block/manifold. I think I'm sucking air in from the old carb to manifold gasket, so I ordered new gaskets & thought I should replace the one between the manifold halves too. When the new gaskets get put on I'm hoping that will fix my issues. So now I'm asking will the manifold stay together for me when disassembling the carb from the manifold? It doesn't look like it, but guess I will find out soon enough.
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post #4 of 6 Old 08-07-2013, 10:12 PM
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Re: intake manifold gasket question...

Yep it stays together. When you undo the 4 big bolts holding the intake onto the engine you can take the carb and intake off as a unit. Then you can take the carb off the intake and replace the gasket there. Once the carb is back on the intake, just put your new gaskets down and put the whole assembly back down, tighten the 4 big bolts and you are good to go. You can test those gaskets by spraying starting fluid at the interfaces to see if there is some suckage.

I have two B43M's and just did a bunch of that myself.
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post #5 of 6 Old 09-20-2013, 06:57 PM
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Re: intake manifold gasket question...

Quote:
Originally Posted by rlordjr View Post
Yep it stays together. When you undo the 4 big bolts holding the intake onto the engine you can take the carb and intake off as a unit. Then you can take the carb off the intake and replace the gasket there. Once the carb is back on the intake, just put your new gaskets down and put the whole assembly back down, tighten the 4 big bolts and you are good to go. You can test those gaskets by spraying starting fluid at the interfaces to see if there is some suckage.

I have two B43M's and just did a bunch of that myself.
I have the same manifold 170 2968 and I found out today that I can blow air between the Half
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post #6 of 6 Old 09-22-2013, 08:20 PM
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Re: intake manifold gasket question...

Felpro has a gasket material called (Fel-Ramic) it has one side of perforated metal and the other is a paper like heat proof material. I glue the two paper sides together and cut intake and exhaust gaskets. If done right it wont burn out or blow out. NAPA carries it as do most other auto supply places. It isn't the easiest stuff to work with.
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