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

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Sam F.

07-13-2007 12:06:06




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What should be normal compression on the N series ?? Are they all different, the 8N, 2N, and 9N ??? Thanks




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Ross Pugh(NC)

07-13-2007 13:05:37




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 Re: 9N, 2N, and 8N compression in reply to Sam F., 07-13-2007 12:06:06  
The I&T FO-4 Manual says minimum compression pressure is 90psi(620kPa). The lowest pressure reading must be within 75 percent of the highest. A greater difference indicataes worn or broken rings, leaking or sticking valves or a combination of these problems.



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Sam F.

07-13-2007 13:13:33




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 Re: 9N, 2N, and 8N compression in reply to Ross Pugh(NC), 07-13-2007 13:05:37  
I have 3 at 85 pounds and 1 at 110. Have not tried squirting a little oil in each cylinder to see if that helps raise compression or not. Tractor had been sitting for 2 years and had only run about 5 minutes before I did compression test.



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Bruce (VA)

07-13-2007 15:50:28




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 Re: 9N, 2N, and 8N compression in reply to Sam F., 07-13-2007 13:13:33  
After setting 2 years, the rings could be stuck. Put a tablespoon of MMO or ATF in each cylinder & let it set for a few days.



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Colin King

07-13-2007 12:16:58




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 Re: 9N, 2N, and 8N compression in reply to Sam F., 07-13-2007 12:06:06  
They should be the same and between 120psi-90psi.

Colin, MN



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