For proper operation, the engine crankshaft must be exactly inline with the transmission input shaft. This is accomplished by dialing in the flywheel cover. You need to measure the cover at 9, 12, and 3 o'clock positions, and use shims under the top two bolt holes until the three measurements are within .006" of each other.
To keep the crankshaft clearance from messing up your measurements, the front of the engine should be pointed down. This will keep the crankshaft forward for all the measurements. After I get things dialed in I add a bit of grease to the shims so they don't fall out of place while the bolts are removed to add the throttle linkage after the engine is installed.
I was lucky enough to find an original crankshaft turning tool at a swap meet, but you can also make your own. As I turn the tool from the 9 to 12 position I hold the tip of the dial indicator so it doesn't snap into the open space. This is a precision instrument and needs to be handled with care.
In the second picture I am checking the flywheel mounting flange for runout. Hopefully this will be zero, but some crank grinders don't know the flange MUST be concentric to the rear main journal.
Dialing in Flywheel Cover.jpgDialing In Flywheel Cover2.jpg
To keep the crankshaft clearance from messing up your measurements, the front of the engine should be pointed down. This will keep the crankshaft forward for all the measurements. After I get things dialed in I add a bit of grease to the shims so they don't fall out of place while the bolts are removed to add the throttle linkage after the engine is installed.
I was lucky enough to find an original crankshaft turning tool at a swap meet, but you can also make your own. As I turn the tool from the 9 to 12 position I hold the tip of the dial indicator so it doesn't snap into the open space. This is a precision instrument and needs to be handled with care.
In the second picture I am checking the flywheel mounting flange for runout. Hopefully this will be zero, but some crank grinders don't know the flange MUST be concentric to the rear main journal.
Dialing in Flywheel Cover.jpgDialing In Flywheel Cover2.jpg
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