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Allis Chalmers Discussion Forum
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Re: Allis Chalmers WC magneto alignment

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bjb in Tx from Ne

07-05-2013 09:39:20

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Assuming you have the FMJ magneto and it is properly timed internally.

1. Make sure you are on the compression stroke of #1 (Front Cylinder). Line the Fire mark up in the window at the bottom of the bell housing.

2. Mount the magneto to the governed shaft.

3. Remove the distributor cover from mag.

4. rotate the magneto backwards until the rotor approximately lines up with the 4-cyclinder raised bar (should be in the upper right corner).

5. Mount the assembly into the tractor so when the gear meshes you are still lined up on that mark.

6. Bolt the assembly down and then fine tune the mag angle so the rotor lines up with the mark. Tighten the mag

7. The wires from front to back of the engine are 1 upper left; 2 upper right; 4 lower right; 3 lower left.

The tractor should be properly time.

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07-06-2013 19:44:33

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 Re: Allis Chalmers WC magneto alignment in reply to bjb in Tx from Ne, 07-05-2013 09:39:20  
The Fire mark is used with a timing light at high idle. Timing static should be at TDC mark on the flywheel.

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bjb in Tx from Ne

07-08-2013 11:23:09

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 Re: Allis Chalmers WC magneto alignment in reply to CTucker, 07-06-2013 19:44:33  
Not if you use the method I described in my post. FIRE is 30 degrees before TDC. The mark under the cap of the mag sets the rotor properly at the FIRE mark on the flywheel. Rotating the mag backwards takes the impulse out of the equation. This is the procedure described in both the IT manual and the Allis manual for setting the timing on a WC with the FMJ mag.

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