Sponsored Links (Register now to hide all advertisements)
If the main bearings get worn but still can be shimmed out, this puts the crank gear a little bit closer to the cam gear. When mains are repoured and align bored, the tooling is usually keyed off the camshaft to keep the tolerances there but it can still be off. It's a good idea to check the backlash between the gear set during heavy maintenance or overhaul. A feeler gauge or a dial indicator set can be used to check it. You just never know what you will run into with these old motors.