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Hope this helps...from "old" C Manual Timing C Case Tractor Valves are correctly timed when the single punch mark on the crankshaft gear meshes with an identical double punch mark on the camshaft gear. The single punch mark on the camshaft gear should mesh with an identical double punch mark on governor and magneto gear. For checking timing without removing the timing gear cover, use the following data: With tappets adjusted to normal operating gap, number one exhaust valve should be just closed when the flywheel mark �E� is visible at the inspection port in the right side of clutch housing. Valves are correctly timed when the idler gear which has three separate marks on its forward face is installed so that the corresponding marks on the camshaft gear, crankshaft gear and magneto gear are in register. In other words, the camshaft gear �C� mark should register with the �C� mark on the idler gear; the crankshaft gear mark �X� should register with the mark �X� on the idler gear; and the magneto gear mark �M� with the mark �M� on the idler gear. To check valve timing when engine is assembled, crank engine until inlet valve of No. 1 cylinder is just starting to open. At this time, the flywheel mark �IN-O� should be in register within � inch with the index pointer over the flywheel.
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