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Case Tractors Discussion Forum
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Compression Testing 300

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hobbyfarmerinwi

03-13-2008 19:50:11




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Does anyone have the factory spec of what a 148 gas engine should be.

Does anyone have any idea what, after 50 yrs of use, would be an acceptable compression readings?




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Joe (Wa)

03-13-2008 22:40:43




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 Re: Compression Testing 300 in reply to hobbyfarmerinwi, 03-13-2008 19:50:11  
Service manual: Gas engine is 140 - 150 psi, not to vary more than 5 psi between cylinders.

Well that is fine if need a hard working, full power tractor. For a light duty, hobby tractor as long as you don't have significant blowbye, I would guess this engine would start and run decent down to 110 or 120 PSI. Don't expect a lot of lugging power. The spread is important, 10 psi gets my heartburn going.

Use a quality compression checker and a known good battery. I usually have a charger on the battery during the check to ensure the same cranking rpm for all cylinders.

Joe

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hobbyfarmerinwi

03-14-2008 03:54:11




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 Re: Compression Testing 300 in reply to Joe (Wa), 03-13-2008 22:40:43  
Thank you Joe, that was exactly the info I was looking for.



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wayne2

03-14-2008 21:34:47




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 Re: Compression Testing 300 in reply to hobbyfarmerinwi, 03-14-2008 03:54:11  
Joe, you are always on the Mark!!! I gave up on comp. testers in 65 they never said anything good!!! My 300 148 always starts in spring(knock wood)does some log yarding,rakes the wash boaded Co.road-makes my wife smile when she drives it. couldn't ask more for adding gas and a little oil here and there. W



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