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Farmall M backfiring

S

Senator

Member
Bought a M yesterday, 1944 - gasoline engine, magneto ignition. The thing ran great, "purred" in fact. Drove it around, started and stopped it 4 times, made the deal, loaded it on the trailer and brought it home. Well, this morning went to get it off the trailer and now it"s backfiring, pretty bad in fact.

So I guess all that is a preamble for my question. I am very familiar with H"s (have two), but do not have a manual for M"s. Until I get one, are the tune-up specs(timing, point settings, etc) pretty much the same on M"s?
I"m gonna dig into this thing later today and try to figure out the issue.

At this time I"m assuming ignition might be the problem, but any other ideas would be appreciated.
 
(quoted from post at 12:08:14 09/07/14) Bought a M yesterday, 1944 - gasoline engine, magneto ignition. The thing ran great, "purred" in fact. Drove it around, started and stopped it 4 times, made the deal, loaded it on the trailer and brought it home. Well, this morning went to get it off the trailer and now it"s backfiring, pretty bad in fact.

So I guess all that is a preamble for my question. I am very familiar with H"s (have two), but do not have a manual for M"s. Until I get one, are the tune-up specs(timing, point settings, etc) pretty much the same on M"s?
I"m gonna dig into this thing later today and try to figure out the issue.

At this time I"m assuming ignition might be the problem, but any other ideas would be appreciated.
Click to expand...

If you can work on an H, you can work on an M. Is it actually back-firing, or is it simply missing? I'd look for a missing plug wire first, and then make sure there is plenty of gas in the tank.
 
If it went through rain, or high Humidity, I would dry out the cap and rotor then spray with WD40, (WD stands for Water Displacement)Jim
 
Yeah, the first thing I checked was the cap and plugs. Dry as a bone.

And yes it is definitly backfiring through the carb and air cleaner.

I must have shook something loose during the trip home.
 
Problem solved!!!

The trip on the trailer must have been bumpy enough to move the points. They were darned near closed all the time. Am suprised it even ran. Adjusted to .013 and runs great again. I love easy fixes.
 
The point gap has probably been narrowing for awhile and now is when it finally got narrow enough to make the engine run bad. Is the point cam dry? That can wear off the rubbing block on the points. Congratulations on your purchase. Jim
 
I swear that tractors get "shipping fever."

It never fails, you buy a working tractor off a farm, something the farmer has been using every day with no troubles, and the second you get it home it starts spewing oil everywhere, has major mechanical issues, the engine starts smoking or knocking, or it just plain won't run...

Bought a Super M right off a guy's manure spreader like that.
 
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