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Ford 9N, 2N & 8N Discussion Forum
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wet and dry compression ( help ross)

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9n again

03-12-2007 17:59:49




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Ross
thanks for answerin about the water in the oil. exactly how do you do a wet and dry compression test. do you test it with oil in the cylinde or something, does the trator have to be warmerd up. thanks for any help




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9n again

03-13-2007 08:40:00




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 Re: wet and dry compression ( help ross) in reply to 9n again, 03-12-2007 17:59:49  
thanks all, ill do it and tell you how it goes



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Ross Pugh(NC)

03-13-2007 06:55:32




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 Re: wet and dry compression ( help ross) in reply to 9n again, 03-12-2007 17:59:49  
9n, Bruce, Va. gave ye the exact instructions fer doing it right. Sounds like ye need to buy yeself a FO-4 Manual that has the written directions fer working on these tractors, best money ye will ever spend!!



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Bob Harvey

03-12-2007 18:14:18




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 Re: wet and dry compression ( help ross) in reply to 9n again, 03-12-2007 17:59:49  
The trick is; check the compression on ALL cyls., write it down. Then, add a 'squirt' of oil to each cyl., let it sit for 1/2 a beer's worth, then check again. Don't forget to wipe off/clean the end of the 'tester' between cyls. Oh, and write it down, compare. 10, PSI difference is O.K., 20 PSI, not so much, but acceptable, MORE is not good. That being said, figure out your wallet size and apply the theorun " if it ain't BROKE...." like the old timey REAL farmers did.

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Bruce (VA)

03-12-2007 18:09:48




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 Re: wet and dry compression ( help ross) in reply to 9n again, 03-12-2007 17:59:49  
For any compression test, you need to have the engine run to operating temp. Turn it off, remove the plugs & the air tube from the carb & make sure the choke is open. Screw the gauge into each cylinder; crank the engine until the gauge stops moving (about 4 -6 puffs usually) and write down the results. After you do all 4, add about a tablespoon of oil to each cylinder & repeat. Write it down, then post back w/ the results. Lots of folks can help you w/ the readings. Check out tip # 43 for an easy way to get the gauge to fit:

http://www.ytmag.com/articles/artint268.htm

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