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Discussion Forum

W-400 Diesel Won't Idle

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09-17-2001 19:12:27

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My W-400 D will run and idle fine on gas, but when I switch it over to diesel it wants to wind up all the way. How do I slow it down and where is the governor on it at? Also, how do I adjust the gas starting valves? Thanks -Ross

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09-18-2001 06:16:54

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 Re: W-400 Diesel Won't Idle in reply to Ross, 09-17-2001 19:12:27  
Has your tractor been sitting for a while? When I first got my MD running after ????? years sitting, it did that. The governor linkage inside of the injection pump was rusty and stuck. Take the oval shaped cover off of the side of the pump and confirm that the linkage inside under the cover moves freely back and forth when the throttle control is moved from one extreme to the other. I'll bet it smokes like heck when it's running on gas from all the diesel fuel it's burning too. Mine sure did.

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09-18-2001 05:42:24

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 Re: W-400 Diesel Won't Idle in reply to Ross, 09-17-2001 19:12:27  
Most of the time it's in the throttle linkage, it's worn. You might need to adjust the idle on the out side of the pump, the two nut with the two springs.

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09-18-2001 05:35:35

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 Re: W-400 Diesel Won't Idle in reply to Ross, 09-17-2001 19:12:27  
The governor is inside the injection pump case. I have an MD, not a 400, but I think they are similar. It sounds as though you may not have the friction control which is part of the starting control mechanism mounted on the side of the block adjusted properly. The speed control lever on these engines is tight and takes some effort to move because of that friction control. If not set tight enough, it could be letting the speed control go to max. If it is not that, the problem is going to be inside the injection pump. Is the engine running away, or just going to max high idle??

To adjust the gas starting valves, you have to remove the valve cover and adjust the clearance. Starting valve clearance for the MD is .060 to .080 inch(valves closed, that means starting mechanism in diesel position). The regular engine valve clearance is .017 inch. If you are getting into adjustments on the starting system, I strongly suggest you get a service manual. There are a number of things that need to be checked out to get it all right.

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09-18-2001 13:18:53

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 Re: Re: W-400 Diesel Won't Idle in reply to Haas, 09-18-2001 05:35:35  
The W-400 I bought with an MD and they had been sitting for a year or two.It wants to run wide open but I'll check over everything you guys suggested. Thanks -Ross

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