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Allis Chalmers Discussion Forum

allis b not fireing

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wilburn

09-19-2003 19:23:23

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i just bought a allis b and it will not crank .we have tryed to pull it and it still will not start.how do i check the mag to see if it is fireing.and it has been changed to 12 volt system
tractor has been sitting but not that long.if you can help me i would be grateful.

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Rod (NH)

09-19-2003 21:07:28

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Re: allis b not fireing in reply to wilburn, 09-19-2003 19:23:23

Hi Wilburn,

I am not sure what you mean by "it will not crank". Are you saying it won't even turn over? If it is a mag ignition the fact that it has been converted to 12v has nothing to do with the ignition, only the starter. If it will turn over with the starter, then look into the magneto spark. Pull one of the plugs and ground it. Turn the engine over while watching the plug gap. If you get a spark, next thing to investigate would be the timing. Also check that you have fresh fuel and there is no indication of moisture in the fuel bowl.

Rod

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wilburn

09-20-2003 07:23:56

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Re: Re: allis b not fireing in reply to Rod (NH), 09-19-2003 21:07:28

ok,i checked the mag ,it is not fireing. ist question, what is the gap for the points. 2nd question, how do i check the timeing, 3rd what is the fireing order ,how can i tell what model b i have ,as you can see i am a greenhorn ,but i am learning a little at a time, if the time is off how do i reset it .that is all for now .i appreciate any help you can give me ,thanks a bunch

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Rod (NH)

09-20-2003 09:31:15

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Re: Re: Re: allis b not fireing in reply to wilburn, 09-20-2003 07:23:56

The point gap is 0.015"- 0.020". Plugs are 0.030"- 0.040". Firing order is 1,2,4,3 with #1 at front of engine. Timing details (external and internal) for an FMJ magneto are in this pdf file. There are two timing marks on the flywheel observable through the opening (about 1" in dia.) on the left side of the torque tube. If you use the advance spark position method identified in the pdf file, you use the "fire" mark. If you use the impulse coupling trip method, you use the "center" mark. As the pdf file indicates, make sure your #1 piston is coming up on the compression stroke and not the exhaust stroke.

To find the year of your B, find the serial number next to the gear shift lever and go to the serial number link under "research and info" on the left of your screen at this site.

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wilburn

09-20-2003 12:29:53

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Re: Re: Re: Re: allis b not fireing in reply to Rod (NH), 09-20-2003 09:31:15

rod ,thanks for all the advice,got the b running good, i was suprised how easy she started, without your help i would still be worrying with her . thanks again

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