Twisted,
Years ago, I was working on a Chevy II 4-banger. I bought a new aluminum cam drive gear and my buddy pressed it on in his press. That sucker rattled like crazy within a few hours of running it. We thought it was a lifter problem, but changing lifters made no difference what so ever. Thought it may have been a fuel pump...we put in another one...no difference. I drove the car and it ran well...ran like a watch, in fact.......it just rattled. Finally, I could stand it no longer and tore the engine back down. I could pull the cam gear off with my hands!
That time, I heated the gear, slid it onto the cam effortlessly and when it cooled, it was locked in place. Never had any more problems after that!
