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Jim, Bear with me. I had a hard time with your sketch. As I understand it, the inner thrust washer sits between the crank thrust face and the front main bearing/bearing support. On the other side of the main bearing support( i.e. the front side of the block)sits the outer thrust washer. Next come the shims and they sit against the front face of the main bearing journal and then comes the Crankshaft thrust plate. Then follows the timing gear and it"s slinger followed by the pulley, the washer and the bolt. It appears to me that the hole in the Crankshaft thrust plate is smaller then the OD of the shims.So when the timing gear is pressed on, it presses on the Crankshaft thrust plate which presses on the shims, which press against the front of the main bearing journal. So when you put the shims in to move the Crankshaft thrust plate away from the outer thrust washer and that sets the end play.
Why can"t you set zero clearance( i.e. no shims) and then just add 0.003" shim? Or suppose you could only get 0.001" or 0.002" clearance with no shims. You could still add an 0.003" shim and be within the 0.003"-0.007 " clearance requirement. What am I missing?
I"m saying this out of ignorance "cuz I don"t know the details of the design and the pictures in my manual are not clear. I think the timing gear/slinger, thrust plate and front of the bearing journal plus the shim(s) set the clearance. It appears to me that the timing gear is keyed to the shaft. Is it a press fit? I appreciate your assistance in helping me to understand this. Not being a mechanical design guy, it takes me a while to get this. Never know when I might have to do this!
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