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Re: Compression tester

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Author  [Modern View]

01-26-2013 05:22:52

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Mark I am needing to check my compression in my 37A too. I was going to make a adaptor out of a old plug.My tractor is running on one cylinder and has lots of blow by.When it warms up some im going to check mine.How would be the best way to check a hand start?Im thinking getting someone to pull it like if you was to pull start it and then i could walk beside it and read the gauge.I dont know if hand cranking it would be fast enough to get a good reading.

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Mike M

01-26-2013 06:13:13

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 Re: Compression tester in reply to pbb, 01-26-2013 05:22:52  
Hook TWO together using a flat belt on the belt pulleys. Best way to turn them for tests.

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Cliff Nelson

01-26-2013 06:01:07

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 Re: Compression tester in reply to pbb, 01-26-2013 05:22:52  
You're right that hand cranking would be too slow. Pulling it will be ok but you need to determine the correct speed for the test. Too fast will show higher compression.

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01-26-2013 20:27:25

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 Re: Compression tester in reply to Cliff Nelson, 01-26-2013 06:01:07  
Hand cranking it works fine. Make sure the throttle is wide open. Run it through about 3 cycles with a tester that holds the pressure. They need very little compression to run nice if your carb is set right & ignition is strong. To strengthen #2 try richen the idle mixture. Turn the idle mixture needle counter clockwise a full turn or more & see if it gets stronger or just smokes. I suspect weak ignition if that dont help. A sticking valve is also possible

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