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Tractor Talk Discussion Forum

Super MD that misses

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Gerald Culverwe

11-08-2007 16:23:57




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I have a SMD Farmall that missfires on #4. The injectors are good, head has been reworked, it runs excellent on the gas side. I am at wits end trying to make it fire.




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Janicholson

11-09-2007 12:48:45




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 Re: Super MD that misses in reply to Gerald Culverwell, 11-08-2007 16:23:57  
The others might be correct, I'll add a quick check of th e#4 start valve. Pull out the #4 sparkplug and pull the tractor in Diesel Mode (even with the fuel shut off) if the valve is stuck, that compression comming out of the spark plug hole will make a lot of racket. JimN



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Gerald Culverwell

11-09-2007 14:26:45




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 Re: Super MD that misses in reply to Janicholson, 11-09-2007 12:48:45  
I checked about the starting valves and no problem there. I also put about a cup of diesel on the pistons when the head was off and was very little seeped by.



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the tractor vet

11-08-2007 19:13:46




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 Re: Super MD that misses in reply to Gerald Culverwell, 11-08-2007 16:23:57  
If ya have a miss in and old gas start diesel and ya say that the head has been redone then ya had best be looken for a crack in the sleeve along with a crack in the block, the crack will run up and down between three and four . Most of the ones that i have found have been between two and three but have found them on other cylinders. Drove me and a buddy plum nuts tryen to find the miss on his MD as we had two missen one bad miss on three and a slight miss on 2 . End up boring the block and pressen in repair sleeves and reboring for the std. sleeves . YA got to remember just how old these engines are and how many times that they have been heated up and cooled down and Stress cracks start . It is it's way of relieving it's self.

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Jim J

11-08-2007 17:58:32




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 Re: Super MD that misses in reply to Gerald Culverwell, 11-08-2007 16:23:57  
I bought a SMD that ran good on gas and missed on diesel and one of the sleeves was in pieces in the oil pan



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Doc Larry

11-08-2007 17:51:03




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 Re: Super MD that misses in reply to Gerald Culverwell, 11-08-2007 16:23:57  
I agree with Jon. I'd check the starter valve on # 4 to see if it might be stuck in the open position. Seems to happen quite often.

Larry



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Jon Hagen

11-08-2007 17:09:51




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 Re: Super MD that misses in reply to Gerald Culverwell, 11-08-2007 16:23:57  
sounds like the gas portion of the combustion chamber is not sealing off when you switch to diesel, keeping the compression too low for compression ignition. Leaky valve, tight valve etc.



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