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Farmall & IHC Tractors Discussion Forum
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engine compression

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bil b va

03-21-2007 15:16:55




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whats normal and satisfactory compression on a IH 300U with a C169 engine?.....thanks bill




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Jimer

03-21-2007 18:22:30




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 Re: engine compression in reply to bil b va, 03-21-2007 15:16:55  
Somewhere I read over 100 PSI was great, if less than 10% difference between the cylinders. I just checked my 300u last weekend with a cheap tester I picked up. All cylinders were 130+ dry and 150+ wet. Very little difference between any of the cylinders. I am considering this as good, and PLEASE, don't anyone tell me otherwise.



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JayWalt

03-21-2007 19:18:43




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 Re: engine compression in reply to Jimer, 03-21-2007 18:22:30  
yes jimer, that is GREAT.

I dont have the gonads to test mine, it runs good, so I wont give myself something else to worry about =P



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sflem849

03-21-2007 16:29:38




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 Re: engine compression in reply to bil b va, 03-21-2007 15:16:55  
ChadS,
What do you then consider tolerable varience between cylinders? I know when I worked at the marina it was something like ten percent.



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ChadS

03-21-2007 21:54:26




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 Re: engine compression in reply to sflem849, 03-21-2007 16:29:38  
I can live with it up to 10 psi. Much over that and its time to have a closer look. Could be rings,valves,valve guides, rocker arm tips, rocker arm bushings, cam lobes, head gasket, or simply, valve lash is out of adjustment. Cyl pressure can tell you alot of things, the best adjustments/repairs are those that raise cyl pressure,,, most of what was mentioned are the most famous wear spots that can cause a cyl to be off. Chad

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ChadS

03-21-2007 21:54:20




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 Re: engine compression in reply to sflem849, 03-21-2007 16:29:38  
I can live with it up to 10 psi. Much over that and its time to have a closer look. Could be rings,valves,valve guides, rocker arm tips, rocker arm bushings, cam lobes, head gasket, or simply, valve lash is out of adjustment. Cyl pressure can tell you alot of things, the best adjustments/repairs are those that raise cyl pressure,,, most of what was mentioned are the most famous wear spots that can cause a cyl to be off. Chad

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ChadS

03-21-2007 15:48:22




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 Re: engine compression in reply to bil b va, 03-21-2007 15:16:55  
Anywhere from 100-150psi at cranking speed with the spark plugs removed and the throttle wide open. ChadS



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