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 11-05-2004, 11:45 Post: 99880
jdlx173



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I have a question for you guys. My brother in law has a Ford 3000, 3 cylinder tractor. What's the compression supposed to be? I did a compression test on it and got about 25 pounds per cylinder. I know my John Deere 420 gets about 100 pds. I can't get the Ford started. I rebuilt the carb and all the electical and to no avail. It still doesn't start. I think there's somthing wrong in the engine but my brother in law doesn't think so. So any imput would be appreciated. Sorry for bringing a Ford into the John Deere forum.






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 11-05-2004, 11:50 Post: 99881
Art White



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Bare minumum to get that engine running would be more then double then what you are saying you have. I figure that it is a gas engine, and they will often run with lower compression then the 120 to 130 that they are supposed to have but you will have little power.






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 11-05-2004, 11:55 Post: 99884
jdlx173



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Yes it's a gas engine, I should of clarified that. What would be the minimum comp. be for it to start?






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 11-05-2004, 12:01 Post: 99885
denwood



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 compression

I was told near 100 psi is necessary to run. you may try adding a little oil to moisten cylinders and boost it, rings may be stuck and dry. I doubt oil will boost the numbers you are getting enough to run.






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 11-05-2004, 12:04 Post: 99886
Billy

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You ain't gonna get it started with that amount of compression. If this is the gas engine, you need at the very least 50 lbs of compression. Even at that, you'd have to spin the engine pretty fast to get it started. Then you won't have much power.

Sounds like this tractor has set a long while? If so, sounds like the rings are stuck.






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 11-05-2004, 12:05 Post: 99887
Murf

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 compression

JD, as Art stated, I doubt you could get an engine to light up with anything less than 50 psi as a bare minimum.

Any clue as to the background of that beast? I can't believe it got worn to the point of 25 psi in all 3 cylinders. In fact with compresssion that low I'd be wondering about a mechanical problem, any chance it got frozen and that opened the cylinders or something like that?

Best of luck.






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 11-05-2004, 12:06 Post: 99888
jdlx173



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Thanks for the imfo. I'll try it and see what happens. What would be the next thing to do if that doesn't work . I thought about popping the head to see if the head gasket is blown but than wouldn't I get more compression on one of the other cylinders?






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 11-05-2004, 12:10 Post: 99889
jdlx173



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Yes the tractor does sit outside during the winter, But I been getting it to run for the past several years un til this year. so maybe you guys have a point that there's a intermal problem.






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 11-05-2004, 12:16 Post: 99892
Billy

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Since all 3 cylinders have the same reading, I'd go with stuck rings. Course it could be valves not seating but pouring oil in the cylinders (if the compression comes up drastically) would rule the valve problem out.






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 11-05-2004, 12:20 Post: 99894
jdlx173



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Thanks for the heads up. I'll try it and see what happens.






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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Art White 2 | BillMullens 2 | Billy 3 | denwood 1 | drh1983 1 | jdlx173 6 | Murf 1 |




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