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Low Compression

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Ron in Ohio

02-12-2002 09:03:47




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Hello All:

I've got a general question about low compression in N tractors. Would you expect a tractor that hadn't been started for 2 months to have low compression(i.e., less than 70 psi)? My 46 2N wouldn't start and after replacing the coil, plugs, rotor, condensor,and points and rebuilding the carburetor, I decided to check compression. The results dry ranged from 50-70 psi. Wet, the pressure went up to 75 psi or so. Also, after the wet test, I was able to start the tractor and have been able to start it for 5 days in a row with temperatures down to 25 degees F. I realize the oil probably helped to seal the rings and increase the compression level but I'm surprised that I have been able to start it everyday since even in cold temps. I will check the compression again but was wondering about the lack of compression after not running for 2 months. Would appreciate inputs or comments from you all.

Ron

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Dell (WA)

02-12-2002 09:33:22




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 Re: Low Compression in reply to Ron in Ohio, 02-12-2002 09:03:47  
Ron..... ..what Salmoneye said.....

Sometimes even brand new engines need to get "compression primed" with squirt of oil to seal rings.

Oil can and does leak down the cylinder walls over time of non-runnin'. Its a capillary thing.

Yeah, check yer compressions again, both with cold engine and a warmed up engine. Its the hot engine compression that really tells the story of engine condition.

I'd probably run a can of Marvel Mystery Oil innna oil for about 10 hrs and then drain and change filter..... ...Dell

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Ron in Ohio

02-12-2002 13:36:45




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 Re: Re: Low Compression in reply to Dell (WA), 02-12-2002 09:33:22  
Thanks Dell and Salmoneye for your inputs. I was wondering where I can get the Marvel Mystery Oil.

Ron



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Bob in NY

02-12-2002 15:47:16




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 Re: Re: Re: Low Compression in reply to Ron in Ohio, 02-12-2002 13:36:45  

Auto parts stores carry Marvel Mystery Oil. Think I saw some in Walmart too. Red can with black lettering.



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Salmoneye

02-12-2002 09:14:35




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 Re: Low Compression in reply to Ron in Ohio, 02-12-2002 09:03:47  
Check the compression again and if it is higher 'dry' now I would say you solved the problem by running her...It was, IMHO...either rings 'stuck' to the pistons and therefore giving a bad seal to the cylinder walls...or it was 'sluggish' valves that are now responding the way they should...



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