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71 SB. ps, ac car. Belt to alternator does not seem to be in line with lower engine pulley. As per assembly manual belt set up should be from motor as follows: Altternator belt then a/c belt with p/s belt on its own pully. However when installed this way the alt belt rubs on p/s unit. So my car seems to have a reverse factory setup so alt belt won't rub p/s unit. Can I shim alternator out?
Hi V,
It appears you MAY have the belts crossed.
I believe your engine/accessory configuration is the upper left example.
A/C belt goes too the forward water pump pulley groove.
Maybe?
Regards,
Alan
Hi V,
It appears you MAY have the belts crossed.
I believe your engine/accessory configuration is the upper left example.
A/C belt goes too the forward water pump pulley groove.
Maybe?
Regards,
Alan
Alan. I've tried to reverse belts as in the assembly manuals upper left diagram. However when done the rear alt belt rubs on p/s unit.
Hi V,
You know I just realized you explained that in your first post!!! DUH!
REALLY reaching here… are both of the crankshaft pulleys the right ones?
I'd think even a 1/2" difference in diameter for the pulley might make a difference?
Added: I just saw your post croak… good question!
Regards,
Alan
Alan. I've measured crank pulley and its the same as your pic.
Croaker. Getting alt belt on is a bit of effort with the alternator being at the beginning of its adjustment. How would a longer belt help? Belt will still be too close to p/s pump. My main concern here is that the uneven wear of the belt due to no rotating straight.
Hi V,
Yes, you could shim the alternator upper and lower mounts a bit.
But the a/c belt would still have that crossed up look to it.
I think for the long haul you need to determine why the belts want to be on the wrong pulleys.
Where is the alternator adjustment on the brace?
Regards,
Alan
Hi V,
Yes, you could shim the alternator upper and lower mounts a bit.
But the a/c belt would still have that crossed up look to it.
I think for the long haul you need to determine why the belts want to be on the wrong pulleys.
Where is the alternator adjustment on the brace?
Regards,
Alan
Vetsic, I believe your a/c compressor is mounted wrong!!! mounting flange on a/c comp. should be mounted in front of the engine bracket. See AIM UPC C60, sheet C3 for 71
Hi V,
It appears you MAY have the belts crossed.
I believe your engine/accessory configuration is the upper left example.
A/C belt goes too the forward water pump pulley groove.
Maybe?
Regards,
Alan
My 74 with A/C has that configuration you mentioned. Alt. Belt runs really close to the P/S, although A/C compressor is nos installed now.
I was wondering too if maybe I should shim the Alt. bracket.
Vetsic, I believe your a/c compressor is mounted wrong!!! mounting flange on a/c comp. should be mounted in front of the engine bracket. See AIM UPC C60, sheet C3 for 71
Good detective work 71. Just checked on car and it looks like ac comp should come forward. Thanks! Still can't figure out why alt belt rubs ps pump.
Hi V,
Just came across a picture of a the brackets for an alternator on a sb with AIR equipment… it uses spacers on the bolts/studs to move the alternator forward.
I think that indicates it would be safe for you to do the same to get away from the pump.
Make sure both bolts have enough length to accept the spacers and still bury enough threads.
Good Luck!
Regards,
Alan
Alan, good info. I was also scanning the vette supply catalogs and found studded bolts for upper right and left water pump mounting indicating air pump attach or ac attach. In either case the hex nut on the stud would act as a spacer. So I added 2 spacers behind alt bracket at the water pump and exhaust manifold. I also removed and straightened the little belt guard the attaches to the ps pump. Both Gave me a bit more room. Now alt belt is in line along with the ac front bracket in its proper mounting position thanks to the keen eye of 71 f/w driver. Hope this can help other with this prob.
Alternator P/S Belt Align Question
