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Allis Chalmers Discussion Forum

Diminishing spark on WD45

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Carl S(MN)

02-02-2004 07:56:27

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I recently purchased a WD45 and it always easily started and ran (roughly and bakfired). Last time I started it, it ran a little and then seemed to load up and die. It did this again but ran for a shorter time and now it only fires when you first start turning it over. The person I bought it form said they replaced the points and plugs and I flushed the fuel suspecting water/ice. Checking spark I noticed a very good strong spark at the plugs on first one and by about the 5th firing it was gone. Could this be caused by the condensor or is likely something more serious with the magneto?

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Steve in N.J.

02-02-2004 19:22:40

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 Re: Diminishing spark on WD45 in reply to Carl S(MN), 02-02-2004 07:56:27  
The condition that you're mentioning, could be a number of small problems in your mag, especially if it's a "J" series Fairbanks. The only way really to find out what the problem child is, is run it on a test bench to isolate the problem. We repair & rebuild mags. Could be as simple as a bad set of contacts to a tired magnetic rotor. Drop us a line, be glad to help you out.... Steve/B&B Custom Circuits

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Larry from MD

02-02-2004 09:11:35

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 Re: Diminishing spark on WD45 in reply to Carl S(MN), 02-02-2004 07:56:27  
A spark that fades away like that is a dead sign of a coil going bad.

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Jim Danforth

02-02-2004 09:02:14

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 Re: Diminishing spark on WD45 in reply to Carl S(MN), 02-02-2004 07:56:27  
Make sure you check the plugs. With a MAG, I always run autolite 295's. Resistor plugs will act wierd like that too.

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02-02-2004 08:11:50

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 Re: Diminishing spark on WD45 in reply to Carl S(MN), 02-02-2004 07:56:27  
It could be the condensor but it could also be the rotor and or cap

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