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 08-11-2005, 14:26 Post: 114715
Tammie
2005-08-11 14:26:04
Post: 114715
 John Deere 720

I have a 1958 JD 720. When the tractor is warm, she sprays diesel fuel out the exhaust; it literally runs out of the exhaust manifold. Can't take it anywhere to pull or use around other people as it gets everyone and everything covered with fuel. Any ideas what might be causing this?

Thanks for your help!






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 08-12-2005, 08:34 Post: 114748
DRankin



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 John Deere 720

Out the exhaust? You must have an exhaust valve hanging open.

Does this model have a compression release to help start it?






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 08-12-2005, 10:49 Post: 114754
Tammie



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 John Deere 720

Yes, it does have the compression lever.






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 08-12-2005, 12:17 Post: 114758
DRankin



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 John Deere 720

That is where I would start looking.....

We have some very good mechanics here, maybe they will chime in.






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 08-12-2005, 13:11 Post: 114759
Tammie



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 John Deere 720

Thanks much - I've passed along the information and will have the exhaust valves checked.






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 08-12-2005, 13:55 Post: 114761
kwschumm



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 John Deere 720

Warning, I'm not a diesel mech. As a guess maybe one or more injectors is dribbling fuel all the time. Maybe a bad injection pump. When it starts spraying fuel does it start running rough?






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 08-12-2005, 13:59 Post: 114763
Chief



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 John Deere 720

The compression release valve is where I would be taking my first look as well.






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 08-13-2005, 15:47 Post: 114814
jdgreen



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 John Deere 720

It sounds like you are running on only one cylinder. While the engine is running, check the temperature of the exhaust manifold. If one side is alot cooler than the other, that is the cylinder at fault. You probably have low compression from either a burnt valve, bent pushrod, or a hole in a piston. Has it always done this? Does it sound any different than it used to? These two cylinder engines are difficult to detect a misfire by sound. A large decrease in power is the best way to determine a misfire. These are great old tractors. Do you have electric start or a pony motor?






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

Thread 114715 Filter by Poster:
Chief 1 | DRankin 2 | jdgreen 1 | kwschumm 1 | Tammie 3 |




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