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If the timing of the cam and crank are off, can I still turn the engine?
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After one tooth off, which is right at 18 degrees, it will not turn. One tooth off will allow it to turn and run. I have some used pistons that prove it

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I just had one that was like that after I had pulled the crank to have it ground/polished and replace the brgs and seals. When initially lining up the crank I did not have the tensioner positioned correctly and the cam/crank became one tooth off (I did not break the chain during the procedure). After turning it over for a handful of times the cam was one tooth off. I repositioned the chain on the cam sprocket, pulled the ip and retimed it. Keep in mind this was all done with the engine on a stand so it was pretty simple.