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Ford 9N, 2N & 8N Discussion Forum
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compression check

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9n adrian

06-16-2004 21:35:50




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I want to check the compression on my tractor but I do not know how to go about doing this. What tools do I need to do this?




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Bob in NC

06-17-2004 07:06:45




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 Re: compression check in reply to 9n adrian, 06-16-2004 21:35:50  
What Rob and Bruce say plus--the engine should be warmed to normal operating temp before the test (assuming it will start). This is supposed to give you a more reliable reading.



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Bob in NC

06-17-2004 07:01:09




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 Re: compression check in reply to 9n adrian, 06-16-2004 21:35:50  
What Rob and Bruce say plus--the engine should be warmed to normal operating temp before the test (assuming it will start). This is supposed to give you a more reliable reading.



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Bruce (VA)

06-17-2004 06:51:15




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 Re: compression check in reply to 9n adrian, 06-16-2004 21:35:50  
What Rob sez....plus, make your life easier by getting a brass 90 degree elbow that fits your new guage. Remove the plug, screw the elbow in, then attach the compression guage to the elbow. You do not need the elbow to check compression, but if you do not use it, you will find out that getting the guage into the head is a real PITA because the gas tank is only about 4 inches above the head.



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Rob

06-17-2004 04:25:12




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 Re: compression check in reply to 9n adrian, 06-16-2004 21:35:50  
You need a compression tester available at the autoparts store for like $15...maybe $25...can't remember. Think $15.
You need some oil so you can put a couple tablespoons in each cylinder for the wet part. Test with the throttle full open and all plugs removed. Screw the tester in and crank the engine until the gage peaks. 8 cranks or so, you'll see. Write it down. Remove the tester and put the oil in the plug hole and quickly test again. Write it down. Repeat for each cylinder.
Spec is 90psi. If the psi jumps up with the oil that says the rings are leaking. If the pressure is low even with the oil the valves are leaking and maybe the rings too.
Post your results and someone might see something.

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