Go BottomJohn Deere 720
 | Tammie
Join Date: Aug 2005 Posts: 3 NH 
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2005-08-11 114715
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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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2005-08-12 114748
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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| Tammie
Join Date: Aug 2005 Posts: 3 NH
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2005-08-12 114754
Yes, it does have the compression lever. ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2005-08-12 114758
That is where I would start looking.....
We have some very good mechanics here, maybe they will chime in. ....
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| Tammie
Join Date: Aug 2005 Posts: 3 NH
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2005-08-12 114759
Thanks much - I've passed along the information and will have the exhaust valves checked. ....
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 | kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon
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2005-08-12 114761
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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 | Chief
Join Date: Jul 2003 Posts: 4297 Southwest MiddleTennessee
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2005-08-12 114763
The compression release valve is where I would be taking my first look as well. ....
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| jdgreen
Join Date: Jul 2003 Posts: 232 Maryland
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2005-08-13 114814
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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