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Allis Chalmers Discussion Forum

WD engine won't start

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01-07-2004 14:02:22

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I recently bought a WD-45 with a WD motor in it. It's set up on a 12V system. We are having trouble getting it started. We have gas flow and compression...spark is the problem. We replaced the coil, distributor cap and points. There is a fairly good spark from the coil, decent spark at the points, but no spark what-so-ever through the plug wires to the plugs. We're using a good, fully charged 12V battery, and the engine turns over easily. I'm used to working on Oliver tractors, so this AC is a little different. Any suggestions?

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Steve in N.J.

01-07-2004 20:13:05

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 Re: WD engine won't start in reply to ED, 01-07-2004 14:02:22  
If you have plenty of spark at the coil, I suggest the same as Duey, check the spark plug wires, and or the plugs. Sounds like the current isn't reaching the plugs. Also, make sure your WD's ignition circuit is equipped with either a ballest resistor or a coil with an internal resistor to cut down the voltage to the contacts so you don't burn the contacts up. (internal coil is better)Most 12V ignition circuits need to have the correct ohms rating (2.7-3.3)in the ignition circuit so the engine will run correctly, and to establish the correct voltage and amperage in that circuit. If you need any help or the above ignition parts, drop us a line. We design the correct style spark plug wires and have all the correct ignition parts in stock...Be glad to help ya out! (973) 697-5747 or customcircuits@aol.com
Steve/B&B Custom Circuits

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01-12-2004 05:14:15

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 Re: Re: WD engine won't start in reply to Steve in N.J., 01-07-2004 20:13:05  
i had problem with as simple as silicone wires if all else fails find a higher quality set of wires

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01-08-2004 15:34:41

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 Re: Re: WD engine won't start in reply to Steve in N.J., 01-07-2004 20:13:05  
Make sure that you have the correct rotor for this tractor. Just any rotor for a Delco system may not work. Have run into this before.

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01-07-2004 19:29:57

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 Re: WD engine won't start in reply to ED, 01-07-2004 14:02:22  
This might sound extremely silly, but did you put the rotor back on?

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Duey (IA)

01-07-2004 19:05:35

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 Re: WD engine won't start in reply to ED, 01-07-2004 14:02:22  
You probably have the wrong type of plug wires (copper wire required)(newer automotive wires will not work). Also be sure you do NOT have Champion plugs. Duey

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01-07-2004 14:18:48

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 Re: WD engine won't start in reply to ED, 01-07-2004 14:02:22  
Quick check

Put a spark plug on the coil, ground it, and crank. If you have good fire there, but none after the distributor, check the continuity of the coil wire. If it's ok be sure the timing is set close (ie the point open when the rotor is pointed at a terminal on the cap). Then replace the cap and rotor.

The coil produces the spark voltage; if it's good and makes a hot spark at the plug then the distribution system is at fault. All the cap and rotor do is send the coil's voltage to a plug. If the coil wire, rotor or cap is bad, or the rotor isn't pointed at a terminal on the cap, the voltage will not reach the plug.

If I was a betting man I'd say the rotor too. But I have seen caps where the center tower carbon contact was broken, hence good fire at the coil and none at the distributor outputs.

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01-07-2004 14:08:05

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 Re: WD engine won't start in reply to ED, 01-07-2004 14:02:22  
Did you replace the rotor My Oliver about once a year kills the rotor and does the same thing, put new rotor in and off I go. The bad thing is it likes to do it when I need it the most

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