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Farmall & IHC Tractors Discussion Forum
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MD engine goes wide open when switched over.

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Steve Sawyer

03-14-2007 22:50:19




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Picked up a 52 Super MD. Sat in barn for 25 years. Had new heads and M&W pistons and sleeves installed before it was parked. After draining all the fluids and replacing the wiring harness and alot of small problems, I got the engine to fire on gas. It runs fairly well on gas and starts easily even when in the teens. But when I try to switch it over to deisel the engine wants to rev wide open no matter what position the throttle is in. The injector pump case was full of fuel when I drained it, probably from leaking down over the years. Could the governor in the pump be gumbed up or frooze in full throttle position? Can I get to the governor thru the bottom cover on pump without removing the pump from engine? Is this a common md problem after they have sat long periods of time? Any help would be great.

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nick friend

03-16-2007 15:46:49




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 Re: MD engine goes wide open when switched over. in reply to Steve Sawyer, 03-14-2007 22:50:19  
can anyone tell me where I can get a fuel settement glass dor a 400d. Should be the same on a MD.



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Doc Larry

03-16-2007 04:44:01




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 Re: MD engine goes wide open when switched over. in reply to Steve Sawyer, 03-14-2007 22:50:19  
I agree with both below, your rack is probably stuck, and the seal on the transfer pump is leaking. However, to get to the rack on your pump (probably an "A" model) you need to remove the oil filler tub. Then you can get to the end of the rack and free it up with some WD40. You might want to see how fast the fuel is leaking into the injector pump before you fight that problem. If it's slow, you might want to shut the fuel off when the tractor sits rather than pull the pump and deal with that.

Larry

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the Unforgiven

03-15-2007 06:20:09




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 Re: MD engine goes wide open when switched over. in reply to Steve Sawyer, 03-14-2007 22:50:19  
Hi Steve, I would probably agree about the stuck rack. I don't know about fuel filling the pump while in storage, I would bet that the seals in the transfer pump are shot, letting fuel spill into and fill the main pump housing. I am working on a 450 with the same trouble.



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n9lhm

03-15-2007 04:03:36




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 Re: MD engine goes wide open when switched over. in reply to Steve Sawyer, 03-14-2007 22:50:19  
The rack is stuck in the wide open position. Take off the oval-shaped cover on the side of the pump and free it up. WD-40 and exercise it. Mine did the same thing. Brian



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