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Allis Chalmers Discussion Forum
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Starting a WD

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Gene K

09-17-2005 07:03:47




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I have an old WD that ran fine until one day last winter it stopped and I couldn"t restart. I have replaced the plugs and plug wires, the condensor and points, and the coil. It turns over but has made absolutely no indication of firing on repeated attempts. This morning I tried again with the same results. I then took one of the plugs out and held the base against the chassis. This confirmed that a small spark could be seen as the engine turned -- and at the same time, I got the first actual sound of firing inside the engine.

I replaced the plug and tried it again. It turned over and over for about 15 seconds without any firing at all and then suddenly gave a huge single backfire.

Questions from a novice mechanic:

-- Does the fact that it actually fired for the first time when one plug was removed give any clue as to what"s happening here?

-- What exactly does the backfire mean (too much gas?) and is there any explosion or other safety hazard with backfires?

-- Any suggestions?

Thanks!

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CHALMERSBOB

09-17-2005 19:37:34




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 Re: Starting a WD in reply to Gene K, 09-17-2005 07:03:47  
REMOVE THE GAS LINE AT THE CARB AND OPEN THE GAS VALVE TO CHECK YOUR FLOW, COULD BE RESTRICTED. WERE THE PLUGS WET? WAS THERE WHITE SMOKE COMING FROM THE EXHAUST? CHECK FIRING ORDER 1243. BOB



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Texas Denny

09-17-2005 17:18:03




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 Re: Starting a WD in reply to Gene K, 09-17-2005 07:03:47  
My first check would be to determine the tdc firing position of #1 cylinder. Once known, I'd check that the rotor is pointing toward the #1 cylinder. Then I'd check the firing order. Next is the point gap. If all of this checks out, it should start.

No, I don't think the belch had anything to do with the removed plug. Something has happpened since it last ran. Maybe the fuel supply.



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old

09-17-2005 08:11:40




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 Re: Starting a WD in reply to Gene K, 09-17-2005 07:03:47  
You could have all sorts of things wrong. For and engine to run it needs 3 things compression, fire and fuel, at the correct time. You say you have spark, but did you put the plug wire back on right, I.E. is your fireing order correct?? Do you have gas to the carb, and is it getting to the plugs. I'd pull the air tube off the carb and make sure you aren't getting to much gas to start with, if you get a lot of gas out of the tube its flooded. If you see no gas and the area is dry you aren't getting enough gas.

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