1972 P/S Pulley Bore Dia.

[Owen L.]

So my dual-groove cast iron power steering pulley became loose on the shaft where the key wore into the pulley bore. I have a machinist who will repair it with a sleeve and recut the keyway but is asking what the bore size should be. This is the earlier style pump with 5/8" shaft and distorted-thread nut to secure the pulley.

Does anyone have an NOS pulley who can accurately measure the bore? My non-factory, over-the-counter rebuilt P/S pump shaft is a little variable in the tenths of an inch neighborhood but measures in the middle of 0.6235".

How snug should the pulley slide onto the shaft?
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[Owen L.]

Anyone?
How about non-NOS?
Thanks, Owen

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[Joe L.]

Anyone?
How about non-NOS?
Thanks, Owen

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Owen-----

I can't get at one of my NOS pulleys at the moment but I will try later today. However, the pulley shaft bore is a TAPERED bore, not a straight bore. Straight bore p/s pump pulleys (and shafts) did not begin until 1975 and none were cast iron.

[Owen L.]

Owen-----

I can't get at one of my NOS pulleys at the moment but I will try later today. However, the pulley shaft bore is a TAPERED bore, not a straight bore. Straight bore p/s pump pulleys (and shafts) did not begin until 1975 and none were cast iron.

Thank you Joe, I'd appreciate that.
I've read conflicting info on tapered or not. My pump shaft appears to be straight 5/8" (0.623") - it is a replacement pump but the proper style reservoir (not canned ham). I'll have to remeasure, but being so short, the taper has got to be tiny.

[Joe L.]

Thank you Joe, I'd appreciate that.
I've read conflicting info on tapered or not. My pump shaft appears to be straight 5/8" (0.623") - it is a replacement pump but the proper style reservoir (not canned ham). I'll have to remeasure, but being so short, the taper has got to be tiny.

Owen-----

It's a very slight taper and difficult to discern visually.

[Joe L.]

Thank you Joe, I'd appreciate that.
I've read conflicting info on tapered or not. My pump shaft appears to be straight 5/8" (0.623") - it is a replacement pump but the proper style reservoir (not canned ham). I'll have to remeasure, but being so short, the taper has got to be tiny.

Owen-----


I measured the diameter of the bore at the outer surface and it's 0.619". I cannot measure the inner diameter since I can't get to it with my calipers and I cannot find my snap gauges.

[Owen L.]

Owen
I measured the diameter of the bore at the outer surface and it's 0.619". I cannot measure the inner diameter since I can't get to it with my calipers and I cannot find my snap gauges.

Thank you Joe.
I ended up buying a new Lares pump because the old (non-original) was an ebay rebuilt purchase just to get the car driveable a few summers ago. As measured by my machinist, the new shaft is a straight 0.6225+/-" and my old pulley bore at the nut is 0.624+" . He is going to sleeve the pulley, size it to the new pump, and cut the keyway.

[Owen L.]

An update: I received the pulley back from the machinist and wanted to post a follow-up.

He opened the bore, inserted a threaded sleeve, pinned it, and then cut the keyway and chamfer on the back. He also reamed the bore to have a tight slip fit on the pump. The large nut covers practically the entire repair, what is visible is really difficult to see with the pump mounted. The pulley doesn't have the slightest wobble in operation. I think he did an outstanding job! Cost: $100.

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