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Old 11-02-2012, 05:00 AM
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Shaft diameter on chevy water pump?

The short water pump on my car is leaking. The pump not used, but is 10 years old. Probably that's why it leaks?
It's an Allstar Performace aluminum, high flow, short pump with 5/8 shaft diameter.

When I buy a new one, should I upgrade to the 3/4" shaft diameter? The price is the same.
Do I have to change the pulley if I buy a pump with the bigger shaft?

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Old 11-02-2012, 05:30 AM
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I'm using a Stewart Components pump with a 3/4" bearing on my SB Ford. It too is about 10-12 years old with never any leakage (yet): Chevrolet: Stewart Components, Inc.

And there shouldn't be a problem with pulleys - though mine are Street and Performance aluminum, they were still purchased to fit a 'stock' wp

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Old 11-02-2012, 05:51 AM
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why not just get a new seal and repair it..
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Old 11-02-2012, 06:12 AM
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I will check for that, too.

The pump was bought app 10 years ago and has been sitting on the motor on my hot rod project since then.
A couple of weeks ago I did the first start start up (a big moment!) and the pump was leaking.

I'm not sure where it leaks from. It's too tight to see for sure.
If it leaks from the back cover, I guess that would be an easy fix.
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Old 11-02-2012, 06:58 AM
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I see no reason to use a water pump with a 3/4" pilot shaft if you have a short water pump. The standard 5/8" pilot shaft serves to locate the pulley, fan or fan clutch. A 3/4" shaft is generally used in a aftermarket long water pump.
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