A timing, check my work

I had posted a couple of weeks ago about losing timing on a 51A and from all of your input I think I have it right now. But here are some pictures. I think I have it correct but want to double check and make sure so I don't chase the wrong things. Finally found some time and here are a few pics. Thanks again for all your help getting me here. Does it look correct?

Also, I found a mark on the cam gear after getting it close and spraying the gear with brake fluid. looks like a mark showed itself that I was unable to see before. Thanks,

PS. The last picture is of a very old 9/16 square socket I have had since I was much younger, and it was old then. First time I have used it. Don't see those too often.

Going to change the oil as it has sat for several years and then give it a try starting it.

Looks to me like you got it. Just make sure you're on compression when you put the mag or distributor on.

Agree with [b:654c4848f0]Mike(NEOhio)[/b:654c4848f0] to "[i:654c4848f0]make sure you're on compression when you put the mag or distributor on[/i:654c4848f0]".

Don't recall if I replied earlier, but take a look at the information below.

the [b:654c4848f0]OPERATOR’S MANUAL No. OM-R2002R JOHN DEERE MODEL “A” SERIES (SERIAL No. 648000 AND UP) TRACTOR[/b:654c4848f0] in the [b:654c4848f0]IGNITION SYSTEM[/b:654c4848f0] section under the [b:654c4848f0]Installing Magneto on Tractor[/b:654c4848f0] topic on pages 34-35.

"[i:654c4848f0]Installing the magneto after it has been removed from the tractor can be done easily as follows: First remove the spark plug on the flywheel side.



Place your finger over the hole and rotate the flywheel in the running direction until you feel a pressure of air in the cylinder. Continue turning the flywheel slowly until the punch mark stamped on the flywheel hub, lines with the “V” grove on the flywheel guard.



In this position the slot in the coupling on the governor shaft will be horizontal.



Next secure a short piece of wire and insert one end in the upper terminal of the distributor cap on the magneto, bend the other end around within 1/8-inch of some metal part of the magneto.



Hold the magneto solidly in the same upright position as when mounted on the tractor.

Grip the driving lug on the impulse coupling firmly and turn the impulse slowly in a left-hand direction (counter-clockwise). Stop instantly when impulse trips and spark occurs between end of wire and magneto frame. When impulse trips, driving lugs on the magneto coupling will be in a horizontal position.

Replace magneto and gasket on the governor case, making sure the impulse coupling lugs engage slots on the governor drive coupling.



A gasket must be used between bolting flanges. After tightening the two cap screws firmly with fingers, rotate the top of the magneto toward front of tractor as far as possible. Then rotate the flywheel one complete turn and line the punch mark on flywheel hub exactly with the “V” groove on the flywheel guard.



Now tap the top of the magneto toward the rear of the tractor a little at a time until the impulse trips.

Tighten the cap screw holding magneto to governor case and install spark plug cables. Left hand spark plug cable must be installed in upper distributor cap terminal.



[b:654c4848f0]Caution: Whenever adjustments are made on the tractor engine, remove the spark plug cables from spark plugs and battery ground cable to prevent accidental starting.[/b:654c4848f0][/i:654c4848f0]"

Hope this helps.

If it backfires when trying to start; just switch the wires in the cap.

(quoted from post at 23:53:27 01/16/21) Looks to me like you got it. Just make sure you're on compression when you put the mag or distributor on.

Click to expand...

Ah, had not thought of that. I get it, Thanks

Yes, you had and they were very helpful. thank you

Probably will wait a bit to run it as I the lane and drive are a skating rink right now. Oh the joys of a gravel drive.

thanks, paired with the post from Mike, makes perfect sense.