Farmall M Timing Gears

Trent Couch · Aug 24, 2018

I installed a new cam gear from this site to allow for the live
hydraulics I plan on adding. This new gear has two dots on
one side and one dot on the opposite side. Looking at my
original gear it looks as if I?m suppose to use just the one dot
but I wanted to make sure has anyone had experience with
this?
Thanks

Janicholson · Aug 24, 2018

I think the two dots are aligned with the single dot on the crank, and the single dot on the cam gear matches the distributor drive mark. Jim

rustred · Aug 24, 2018

something not right there,kinda the problem with buying jobber stuff. where the 2 dots are they are to be one on top of each other not side by side. the double marks go to the distributor gear. you have it timed correctly though. must be chinese made gears and the two marks are not stamped properly.

Bob · Aug 24, 2018

As near as I can judge from the photo (I'm too lazy to try to count the teeth), the marks are exactly 180? apart.

If that's TRUE, it doesn't make any difference which set of marks you use.

For giggles, rotate the crankshaft exactly one turn and see if the crank gear mark winds up between the two marks on the cam gear.

One more turn and you'll be back at the single mark!

Bob M · Aug 25, 2018

The cam gear double punch mark should straddle the single punched tooth on the crankshaft gear. And the cam gear single punched tooth should straddle the double punch on the distributor gear.

Note the cam gear marks are 180 deg apart. Should you time the cam gear "backward" no worries....simply swap the plug wires across the distributor cap (#1 with #4 and #2 with #3) and you'll be good.

ih560 · Aug 25, 2018

According to the I&T shop manual, he has it exactly right as is.

Exact wording from the 400-450 shop manual:
"When installing the timing ears on non-Diesels, mesh single punch marked tooth on crankshaft gear with the single punch marked tooth on the camshaft gear; then mess double punch marked tooth space on camshaft gear with the double punch marked too on the ignition unit drive gear The governor and idler gear need not be timed to the engine."

Oregon Tractor Jack · Aug 25, 2018

Dot to Dot on the cam to crank. Two dots on either side of the distributor drive. I have an engine apart in my shop right now and that is the correct way to set it up.

OTJ

Farmall M Timing Gears

Trent Couch

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Janicholson

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rustred

Well-known Member

Bob

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Bob M

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ih560

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Oregon Tractor Jack

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