case sc

grader56 · Feb 21, 2021

friend brought me a case sc tractor to work on. need help finding #1 top dead center. thanks in advance!

flatpkr · Feb 21, 2021

#1 cylinder is at the radiator end of engine. The flywheel inspection pipe plug is on the left side near the rectangle plate for clutch adjustment.
Hand crank engine until punch mark on the flywheel shows through the inspection hole. This is top dead center for # 1 cylinder. You can also check firing order of the engine by hand cranking the engine with the plugs removed but still attached to wires. When the magneto trips a plug will fire. Make sure plugs are grounded out on the block when checking for spark.
Firing order is 1 4 3 2. As long as the mag is installed correctly you can adjust when the spark plug will fire by loosening the 2 bolts on the mag and rotating the mag, the bottom bolt has an elongated slot so the mag can rotate some. This will allow an adjustment to when the plug fires in relation to the piston position.
Jim

flatpkr · Feb 21, 2021

These pictures and descriptions may help also.

grader56 · Feb 21, 2021

your a lifesaver, thanks! someone has modified this tractor,converted to 12v, gutted magneto,added a coil, just useing mag as a distributor, trying to figure it all out. thanks again

flatpkr · Feb 21, 2021

Been a few years since I owned an SC and worked on them. The book said the flywheel inspection hole is on the right side of the clutch housing. Just off the top of my head I thought it was on the left, but I was wrong.
Jim

flatpkr · Feb 21, 2021

Im guessing the distributor cap is numbered for the plug wires like the magneto is. The magneto makes a click as it rotates and fires a cylinder.
Jim

flatpkr · Feb 21, 2021

Sorry I got the firing order wrong, it is 1 3 4 2. Good thing I looked at the book.
Jim

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