Shouldn't there have been a spacer on the cam when I took the old gear off or is this something that has to be added on when replacing the gear? I did not remove the cam or crank shafts from the engine. I only changed the gears with both shafts intact to the engine. It wsa a pain to put the new gear on since it was a "pressed on" fit. I heated the gear up to about 400 degrees and then used a bolt, nut and large steel washer to push it on.