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Allis Chalmers Discussion Forum

WD motor missing

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05-02-2008 08:37:43

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The third cylinder on my WD doesn"t fire. I have changed plugs, plug wires,points,and condenser. The cylinder compression is the same as other cylinders. Any other suggestions?

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Texas Denny

05-02-2008 20:47:12

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 Re: WD motor missing in reply to DocD, 05-02-2008 08:37:43  
I agree with WD45 but that should affect two cylinders - both 3 and 4. Plugs do occasionally completely fail. So do distributor caps. There could be a carbon track in the cap which redirects the spark to a different plug or ground.

I have the same problem on a Ford 901. It is #3 also but I assume that is a coincidence. I've changed plugs, caps, rotors and wires. As yours, #3 has the best compression. But it will not fire at idle - high rpm yes. I'm about to pull the valve cover and check the cam. I'm thinking it may be gettings an incomplete charge because of a flat cam lobe. It is hard to check the cam on a Ford 901 because of a lot of disassembly. A WD-45 is pretty easy by comparison.

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05-03-2008 16:32:39

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 Re: WD motor missing in reply to Texas Denny, 05-02-2008 20:47:12  
not true, when it happened to me, it only affected cylinder number 1

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05-02-2008 12:07:45

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 Re: WD motor missing in reply to DocD, 05-02-2008 08:37:43  
Get some brake clean and spray it were the manifold meets up with the head, if the rpm's go up, than you will need either new gaskets or you will need to get the manifold planed

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05-02-2008 10:01:16

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 Re: WD motor missing in reply to DocD, 05-02-2008 08:37:43  
Cap or rotor could be bad or the bushings in the distributor may be worn to the point that on the one place the rotor is to far away from the cap to let spark jump the gap. Now then you say it doesn't fire but do you mean you don't have spark on that plug or it just does not run on that cylinder. You could also have a problem with a valve not opening as it should

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05-05-2008 08:13:21

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 Re: WD motor missing in reply to old, 05-02-2008 10:01:16  
It does not run on that cylinder. I have switched plugs and they all come out wet. I assume they are not firing.

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05-05-2008 08:47:36

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 Re: WD motor missing in reply to DocD, 05-05-2008 08:13:21  
Thats why I say a bad cap and or rotor orbushings in the distributor and even a valve that is not opening as it should any one of those can/will cause that problem

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05-07-2008 09:08:03

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 Re: WD motor missing in reply to old, 05-05-2008 08:47:36  
can distributor be repaired or must it be replaced?

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05-07-2008 09:54:39

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 Re: WD motor missing in reply to DocD, 05-07-2008 09:08:03  
They can be rebuilt and have new bushings installed

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