1929 Chevrolet International - 4 Door Sedan Project by BearsFan315

3 minute(s) of a 636 minute read

got a call from the rebuilder last night as he had a few questions, so went by this morning before work to take a look and see what we could do.

he pressed on the NOS Cam Gear i had, and the holes in the cam gear to tighten the bolts on the camshaft thrust plate was wider offset, not enough room to get the required bolts in there and NO clearance to tighten them up if you finagled them in. so opted to enlarge the holes to allow access. bolts go in, can tighten them down, but can not turn the cam, because the bolt heads rub and hit the backside of the cam gear. seems that this cam gear has a larger shoulder/raise area on the rear then the original. the shoulder/raised area is nearly as wide as the gear. so machining the head down would barely leave any head on the bolt, machining back the shoulder/raise area on the back of the gear to clear the bolt head i feel would compromise the gear as a whole.

options are to find another fiber gear with a smaller shoulder/raised area, or try the aluminum aftermarket one which has a smaller shoulder/raised area.

1-22-2021

Talked to the engine builder this afternoon, he said that they got the gears lined up and all set. installed the front cover and gasket. and then heated up the crank pulley and tried to press it on, and sopped half way. they had to pull it back off and doing so broke out the new bushing they had machined and put in there dues to the sloppy loose fit. he thinks they did not HONE it enough and need a looser fit then what they were initially aiming for. also may have been an issue with dissimilar metals expanding and contracting at different rates. i figure it should be a press fit, tap it on or heat up a tad and slide on, not much heat should be needed.

so they are going to machine a new one, hone it to fir the crankshaft again, and try once more. 

i am thinking to avoid any concerns or issues with the bushing coming out if the pulley is removed, would be to bevel the inside of the pulley bore and the outside of the bushing then bevel weld them together once bushing is installed in the pulley. then grind weld down, hone to bushing bore to fit, key bushing/pulley, install. the two should never part.