Re: Model A Book
Along with what Glenn posted, if the timing gear has stripped, the engine will turn over much faster than usual because there is now no compression = the valves are not opening and closing because the camshaft is not turning or is only occasionally catching in the few remaining good teeth. A faster turning engine should be your first clue that the timing gear is toast. Watching the distributor shaft not turning will be the clincher, unless in the very rare case where the oil pump drive gear teeth have stripped. 99 out of 100 times, though, it will be the fiber timing gear that is at fault, not the metal oil pump drive gear.
Marshall
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