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Farmall & IHC Tractors Discussion Forum
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How much compression should a Farmall A have?

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Andy C ole

04-20-2007 06:32:52




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I have been working on a 41 farmall A for a couple of weeks now and have gotten the head back on. I need to know how much compression I am supposed to have when I turn it over.




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Red Dave

04-20-2007 09:48:01




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 Re: How much compression should a Farmall A have? in reply to Andy C ole, 04-20-2007 06:32:52  
Depends on what pistons it has in it. Gas engine called for 105 psi with stock, flat top pistons if I remember correctly.

I've gotten 135-140 psi out of new rebuilds with oversize, high compression pistons.

Shouldn't vary more than 10% from cylinder to cylinder.



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John in Batesville

04-20-2007 20:10:58




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 Re: How much compression should a Farmall A have? in reply to Red Dave, 04-20-2007 09:48:01  
Does anyone make a bushing or adapter so you can use a regular spark plug compression tool to measure compression on a Super A? The thread size on those plugs is huge!



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CSR

04-20-2007 09:02:51




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 Re: How much compression should a Farmall A have? in reply to Andy C ole, 04-20-2007 06:32:52  
I just rebuilt mine with the overbore kit & firecrater pistons. Top ring gap was .018-.020. Used to have ~80 psi, now have 100psi +/- 3psi.



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El Toro

04-20-2007 07:15:45




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 Re: How much compression should a Farmall A have? in reply to Andy C ole, 04-20-2007 06:32:52  
You should have good compression if you have good
rings, cylinders not worn and the valves are seated. These are all related in having good compression. Ideal would be 100-125psi and all readings close to one another. You will need to get it running and make sure all the valves have enough clearance. Then remove all the plugs and do the compression check. We always did it with the throttle at wot. That's wide open throttle.
Hal

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