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View Full Version : keyway or press fit--how to tell?



absintheisfun
09-11-2011, 06:50 PM
I have used the search feature (thinking this was a common question) and searched deep into 2006's posts with no luck...

What is the give-away that identifies your power steering pump as one or the other?

I did some googling and some info, but don't know how much I trust it. What I read was that Keyways will have a nut on the center of the pulley, and pressfit will have an allen-head. Any truth to that?

Thanks!

David Pozzi
09-11-2011, 07:34 PM
Keyway uses a smaller shaft & has a nut. Usually has a male outlet fitting. Around 1974, GM switched to a larger shaft press on pulley with Allen hex in the end.
Only the pulley end of the shaft is different & the outlet fittings can be swapped as needed.
In the early 80's the outlet was changed to a Metric "Saginaw" fitting with an "O" ring seal.

Gitter Dun
09-11-2011, 08:09 PM
What year power steering pulley and from what car? If its pre 74 it will have a key way and Kragens(well now Oreilly's) carries a pulley puller for about $40.

absintheisfun
09-12-2011, 03:10 AM
What year power steering pulley and from what car? If its pre 74 it will have a key way and Kragens(well now Oreilly's) carries a pulley puller for about $40.

I have no idea. I converted my 63 C10 to power steering and got a pulley from a 70's C10, but have absolutely no clue on specific year. The pulleys don't quite line up right so I'm going to get a front runner that is designed to work together.

SLO_Z28
09-12-2011, 03:30 AM
1974 is still the bolt on style pump. I think 1975 was the first year of the press on style, but im not sure on that.

MonzaRacer
09-14-2011, 11:20 AM
key way=bolt on
press fit= well self explanatory

absintheisfun
09-17-2011, 03:47 PM
Okay, So I'm sure that this is a keyway, but because I want to make absolute certain before I spend the cash...could anyone be so kind as to verify this is indeed a keyway?

Thanks!
https://static1.pt-content.com/images/pt/2011/09/keyway-1.jpg
https://static1.pt-content.com/images/pt/2011/09/keyway2-1.jpg