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Topic: JD 50 Compression Test
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| Larry Bingham
11-14-2012 02:56:42
96.35.139.10
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Did compression test on JD 50. 60 PSI on both cylinders. Seems low to me. What should compression be? I have IT Shop Manual, but can't find what it should be. All I can find is compression ratio.
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| F-I-T
11-14-2012 09:25:47
184.6.247.3
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Re: JD 50 Compression Test in reply to Cliff Nelson, 11-14-2012 02:56:42
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When you get one that low, unless there is a chunk of deposit in the intake area restricting air flow into the cylinder, you should squirt a couple pumps of oil in, spin it few times, and measureit again. If it comes up, it's likely the oil has sealed worn rings. If it stays low, suspect a leaking valve. Then it's time for a leak down test, and use a length of garden hose to listen through hose to determine where the air is leaking out.
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| Dodgeit
11-14-2012 08:13:53
65.199.61.227
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Re: JD 50 Compression Test in reply to metal4130, 11-14-2012 02:56:42
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I had one that only read 60psi in both cylinders as well. Altough that seems low she pulled like a freight train so I just chalked it up to restricted air flow.
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| F-I-T
11-14-2012 03:37:13
184.6.247.3
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Re: JD 50 Compression Test in reply to Johndeereman, 11-14-2012 02:56:42
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FSB 236 says at teh speed using the starter, a gas engine should read 118 psi, and an All-Fuel 91.5 psi.
Did you test it with the throttle wide open and both plugs out?
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