Re: Timming f20 mag.

Posted by Daniel M. on August 09, 2000 at 21:09:31 from (205.163.39.200):

In Reply to: Timming f20 mag. posted by steve on August 07, 2000 at 15:45:07:

Steve,
Here's What my 1927 Farmall Regular book says about timing a mag. Which I'm 99.9% sure that it will be the same on your F-20.
Use the crank, turn the engine until #1 piston is on the upper dead center on the compression stroke. The compression stroke can easily be determined by removing the #1 spark plug and placing the thumb over the opening until an outward pressure is felt. Continue to turn the engine with the crank until D.C. mark on the fly wheel and the pointer on the bell housing line up, taking into account the rotation of the distributer disk which is clockwise as viewed from the breaker end.
Connect the spark plug cables to the magneto, starting with the #1 cable and attach same to the terminal on the distributor block marked 1; the other cables to be attached according to the firing order, which is 1-3-4-2.
Take hold of the magneto half of the adjustment coupling and rotate the armature until the breaker arm rubbing block is on the highest protion of the cam. The distance between the points while in this position must be .012" to .015" or the thickness of the gauge marked "breaker points" on the magneto wrench. Should the points need adjustment, loosen the fixed breaker point lock nut and adjust the fixed breaker point to the thickness of the gauge, care being taken not to move the fixed breaker point when tightening the lock nut. Advance the spark lever one notch from full retard position and loosen the cap screw in the lever on the spark advance rod. Retard the breaker housing cover as far as possible and with the spark rod connection in place, tighten the cap screw. Without changing this setting remove the breaker housing cover. Remove the ditributer block and rotate the magneto armature in a clockwise direction as viewed from the driving end until the segment in the distributor disk is under the #1 terminal and the magneto points are just opening.
The magneto is now correctly timed with the engine and, care being taken not to change this setting, insert any shims that were removed between the coupling and the two bolts into the adjustment coupling. The coupling is so made that only two of the holes line up exactly opposite to each other and the bolts must not be forced or the settings will be off. Screw on the distributor block and put on the breaker cover housing. Engage the starter pawl (yours may be automatic) and crank the engine until the magneto impulse coupling trips. This should trip on dead center or 8 degrees after dead center, care being taken to check this closely. The magneto is now ready for service.
Good Luck, if you have more questions feel free to email me at farmall@mcn.net
Daniel M.

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