Need help with 4x6 Gator 3 Cyl Diesel Engine problem : Tractor Engine Repair Rebuild  -- Tractor Maintenance Discussion Forum and Review Need help with 4x6 Gator 3 Cyl Diesel Engine problem : Tractor Engine Repair Rebuild -- Tractor Maintenance Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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 04-05-2007, 05:42 Post: 141041
SgtKelly



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

I'm with a Marine Corps Unit in Iraq. We have a John Deere Gator 4x6 Diesel here that nobody has seen work since we got here. Regardless, spent the last 20 hours working on it, and it will now start under it's own power. It will run for 20 seconds and then shut down like it's running out of fuel. Wait a few seconds and the cycle will repeat. The fuel filter and pump have been replaced with known good replacements from another one, and the problem still exists. Any help would be greatly appreciated. It goes without saying that out here, parts are not available, and diagnostic tools are limited to very basic things.

The Marines need your help!
Thanks alot for any assitance you can provide...


Edit:

I grabbed the following info off the engine:

Yanmar 3007D003

Engine Model: 3TN66G-EJUV






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 04-05-2007, 21:51 Post: 141068
Art White



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

If that has an electric fuel shut off that might be the problem. To spray WD-40 in the intake would keep it running longer if you are running out of fuel.






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 04-05-2007, 23:25 Post: 141076
SgtKelly



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

It definately doesn't have an electric fuel shut-off.






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 04-05-2007, 23:28 Post: 141077
kwschumm



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

I wonder if there's something in the fuel tank that is getting sucked up to the fuel pick-up and causing fuel starvation. When it shuts down the fuel pick-up clears up and the cycle can start all over again.






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 04-05-2007, 23:31 Post: 141078
greg_g



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

Remove the fuel filter, fill the fuel filter with diesel, replace the fuel filter, start the engine. When it dies, remove the fuel filter. If it's empty, it's not getting supplied sufficiently by the pump.

Refill and reinstall the filter, this time use the hand primer pump to push fuel in the direction of the filter. If this keeps the engine running, check for any inline filter screens that might be partially blocked. These will usually be inside a fitting (may be one in the tank too). Check to make sure the fuel cutoff valve is full open). If all this is good, it's probably the fuel pump. Not the injection pump, just the fuel pump component.

Keep up the good work over there. Thanks, from those that actually care.

//greg//






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 04-06-2007, 00:05 Post: 141079
SgtKelly



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

Thanks. And you're always welcome! And thanks to all of those who came before us....
The Marine Corps loves it's country, and we hope our country feels the same about us....

The fuel filter is clear, and when it starts, you can see the fuel filling up the filter rapidly. Fuel flow IN/OUT of the filter is good. I will check for a screen and/or pickup screen on the tank side of the fuel system, there is definately nothing between the fuel pump (which is new and working properly), and the injection pump which is what I suspect the problem to be. Problem is that there's no way in hell we could get a head gasket unless someone in the states sent it out to us via regular mail. I'll go poke around the fuel tank side for a few minutes right now.






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 04-06-2007, 00:15 Post: 141080
SgtKelly



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

Also keep in mind the environment etc..

Repairs out here are a cross between McGyver and MADMAX and the thunderdome.

We make our own air filters out of coffee filters, duct tape for gaskets, etc....

Iraq is like a living junkyard wars episode.






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 04-06-2007, 02:24 Post: 141082
SgtKelly



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

The pickup tube / screen is clear, no debris in the tank.
The vent hose is in good shape / no restrictions.

So, good pickup, good filter, good fuel pump = problem with injector pump?






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 04-06-2007, 07:04 Post: 141084
greg_g



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

I've had two Yanmar diesels in the past, a 24hp duece and a 22hp three banger. I can't quite feature how it would even start with a bad injection pump. Or are you using starting fluid? That said, both mine had conventional spin-on fuel filters. Are you sure that clear thing you're talking about isn't the sediment bowl?

Starting - running for a while - then dying, does point to either fuel or air. But the fact that it starts in the first place should indicate the injection pump is usable. Have you tried to keep it running yet with the hand primer pump?

If anybody ever used gas dryer in that tank before, that stuff doesn't play nice with diesel fuel and rubber. When hoses deteriorate from the inside out, they can clog filters and injectors. But they can also form flaps inside, which can block fuel. Sometimes it takes some fuel FLOW before a flap of loose rubber drops in place to ultimately stop the flow. Are you in a position to scrounge the junkyard for replacement hose or tubing?

And air. If you haven't already, take air filtration out of the equation. Disconnect it at the manifold, and let the intake suck in unfiltered air to see if that helps keep it running.

//greg//






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 04-10-2007, 19:58 Post: 141219
Art White



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 Need help with 4x6 Gator 3 Cyl Diesel Engine problem

On most systems there is a fuel return line and if that is plugged that could cause this..






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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