Packard Forum Index » V-8 (1955-56)

The first three pictures show what was on the 400 way back when I decided to start the restoration. And yes, damages seen were present on the car at the initial time of my initial dis-assembly. The 400 had a Mark IV AC unit on board at such time.

Second two pictures depict how the vehicle is presently equipped.

What can I conclude from both sets of pictures?

All comments appreciated.

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The first question I would have is are there two separate pulleys nested together or is that a single casting with two grooves on the first two photos.

If a single casting, there appears to be a damaged but proper smaller diameter AC pulley and a damaged PS pulley. There is something odd looking if it is factory. Factory pulleys had a bit of separation or space between the two grooves. I don't see that on your photos unless it is camera angle. Since you had a Mk IV that may be their version. If two separate pulleys then possibly part of a damper and then an aftermarket AC drive pulley.

The bottom two photos appear to show the addition of a second PS pulley nested within the first hence the same diameter and grooves right next to one another.

The third photo I can't tell enough about. It's different looking. Would really like to see if it nests in a vibration damper properly or if in fact it does not. Typically the factory pulley hubs were slightly conical and had three grooves which nested with three mating parts in the center of vibration damper to lock them together. That one does not appear to have that and also looks a little small to nest. As mentioned above, if it is a single pulley it could be a part of vibration damper which separated from the balance portion at the vulcanization. Just too hard to tell.

Here is a photo of a factory setup. The left groove is on the damper and with a slight space, front two are the added section containing PS groove and separated by about 1/2 inch the smaller diameter AC groove. I don't know if it is possible to repair groove damage like that shown on yours but as rare as those drive pulleys are, would be a shame to have to junk it.

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Other than the chipped pulley edges, it appears that the outer (ac) is of a smaller diameter?
If so this would drive the ac compressor at a higher rpm.
Of the few ac units I have seen on Packards,pulleys are of the same diameter

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Actually, the smaller drive pulley generally is designed to move the compressor at a lower RPM. That again depends on the size of the compressor pulley but the older reciprocating piston units didn't like high RPMs. Most had some fairly large compressor side pulleys mated with the smaller drive side.

High RPM is not as much of an issue with todays rotary units but a big deal on some of those monster jobs in the 50's.

Need to think again. The smaller pulley on the crank will drive compressor SLOWER than a larger pulley. IIRC The pulley as pictured above if Al. is 56 oem AC pulley, and thus smaller diameter.