farmall m timing?

henryrit

Member
I set the timing on my m with a timing light to the first notch and when the tractor is revved to full throttle it"s advancing 25 degrees, it"s a Delco upright distributor that has a electronic ignition in it, is this right or should it be advancing more?
 
There are three different advance curves for Famall tractors. 40 degree advance for a distillate tractor, 30 degrees for standard gas tractor and 25 degrees for a gas tractor with Fire Crater(high domed)pistons. Without more information on what engine modifications that were made in the past it would be hard to tell. Most likely that is the correct timing advance. International and M&W used to offer an upgrade rebuild kit. It was a set of oversized Fire Crater pistons and sleeves and a new distributor advance plate and springs. This would give a 25 degree advance for the higher compression engine. I have an M that was retrofitted with this kit and it has the 25 degree advance.
 
If you have a common M pulley with 2 notches close to each other. First notch that gets to pointer when turning in normal rotation it TDC.
If you set to that notch at wide open, time will be retarded.
 
I set the first notch at idle ,then ran it wide open and checked to see how much it was advancing,my timing light has advance on it.
 
I did change the head gasket in it and it does have high dome 4" fire crater pistons in it.the only other thing is the advance springs where all stretched out so I put some new ones in it out of a different dist.that seemed to be in good shape.
 

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