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My original 268 generator has solid end plates without rubber bushings with a 4" diameter, flush-mount deep V pulley. I also have an original 3768152 U-bracket with a reproduction 3755555 plate. However, my set-up is 1/4" off in alignment with the water pump pulley (see first attached photo). Has anyone else had this problem?
I've reviewed all the material I have here... a 1966 Chevrolet P&A Catalog, the most recent NCRS '61 - '62 Judging Guide, and a Corvette Central Catalog. They all say that '62 FI cars used a combination of a #3768152, 7.125"-long U-bracket and a #3755555 mounting plate or "brace" with a 268 generator. This combination of parts can't be mounted incorrectly; the bolt hole locations are symmetrical.
I'll probably end up modifying the repro plate somehow or install the earlier "wrong" pulley with an offset (last photo) to make it line up right. Thanks for listening.
I had that issue with my 61 but that was caused by use of aftermarket headers - problem was solved for me by just having the plate modified at a machine shop to elongate the mounting holes for back and forth adjustment.
Turns out it was the new Stewart water pump I bought and installed back in 2005.
The pulley flange pressed on the pump shaft is positioned too far away from the pump casting. I can fix that, but the pump has to be off the engine to do it right.
I just measured from the FI adapter plate to the centerline of the belt and got 4.1". My point of reference on the adapter plate was a point directly in front of the more forward of the two thermostat housing bolts.
I realize this is too little, too late to be useful since you've already found the cause of the problem. Maybe it will help some future researcher, though.
2025 C2 of the Year ('63 and '67) Finalist - Unmodified
2024 C2 of the Year Finalist - Unmodified
Originally Posted by jerrybramlett
Turns out it was the new Stewart water pump I bought and installed back in 2005.
The pulley flange pressed on the pump shaft is positioned too far away from the pump casting. I can fix that, but the pump has to be off the engine to do it right.
Sorry I wasted anyone's time with this.
I think we all have been there before Jerry. At least you found the problem an followed up with the root of it! I remember in my earlier parts store days when we had issues as such, more on the reman pumps.
Glad you located the problem. I learned from this post that one has to look at ALL the variables when issues arise. Personally I would have never thought about the water pump flange. Thank you!
'62 FI generator pulley alignment problem
