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Allis C jumps time
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Craig Reavley View Drop Down
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Joined: 16 Sep 2009
Location: Illinois
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    Posted: 15 Jun 2010 at 9:02am
About once a year my 1949 C will jump time and start backfiring, and wont start. I changed the condensor, and it is still backfiring. It ran perfectone minute, and the next time I went to start it it acted liked it fired, and spun the engine backwards, now with a new cndensor all it does is backfire, louder tyhan a shotgun through the muffler
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Dakota Dave View Drop Down
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Points: 3960 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dakota Dave Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2010 at 10:00am

Every thing in you timing is gear driven If you havr jumped timing you got problems.
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Dick L View Drop Down
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Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2010 at 10:07am
It is all gear driven so it can not (jump) time without gear teeth being stripped. So if you have checked for TDC on the compression stroke for number one cylinder and it did not just fire number one spark plug you need to check all the timing gears for missing or stripped teeth, starting in the magneto all the way back to the crankshaft.
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Jeff Z. NY View Drop Down
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Replace the points.
Make sure the strip on the points that rides on the cam is not worn down and make sure the points are gapped correct.
Turn the engine over by hand so the points are on the high spot on the lobe and see what the gap is when the engine is acting up.
If the points are not opening you will get a weak yellow spark and the engine will be out of time and will not run well if it runs at all.

Also make sure the magneto or distributor is bolted down tight.

Edited by Jeff Z. NY - 15 Jun 2010 at 10:20am
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Craig Reavley View Drop Down
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Points: 41 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Craig Reavley Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2010 at 10:27am

I cant imagine I have a broken gear. I went through this motor completely, and everything looked good a few years back.I'll recheck the timing tonight and see what could have changed. I will check the points even though they are a year old. It has a distributor instead of a mag.
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Jeff Z. NY View Drop Down
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Points: 7326 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jeff Z. NY Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2010 at 10:48am
Craig, Last year I was out mowing with the B and it was running well.
I parked it and the next time I went to run it would not start.
Backfired alot.
The tab on the points that rides the cam was almost gone.
Points were not opening.
Changed the points and it ran like new.
How it ran just before that is beyond me.
Stranger things have happened I guess.

Edited by Jeff Z. NY - 15 Jun 2010 at 10:49am
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Crowman17 View Drop Down
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Points: 71 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Crowman17 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2010 at 12:16pm
I had a simular problem with my C and it was the teeth on the fiber gear for the roter were getting stripped caused simular problems.
 
Marc
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Brian Jasper co. Ia View Drop Down
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Points: 10508 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2010 at 1:04pm
I would look the distributor cap over very closely. The dist drive gears would have to be really worn to jump over each other. Can't imagine the cam gears jumping either. Sounds to me like you have a secondary crossfire problem. Look for a crack from the coil post to one of the others or ignition wires cross firing.
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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