Water Pump Shaft size?

[ians]

I posted this in the TR3 forum and received two replies indicating 0.625" was standard. As the pump is pretty standard accross many models I thought I would try here to see if anyone can throw any light on where the pump I have fitted comes from?

 

 

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I have just removed the old 4 vane with grease nipple water pump from the car and pulled off the (wide belt) pulley so that I can fit it to the new uprated pump purchased from TR Shop this week.

 

 

Problem - The pulley shaft on the old pump is 0.591" and the new one is 0.625" which clearly isn't going to work.

 

 

Question - Did I have some sort of non standard pump and pulley fitted or did the spec change somewhere along the line or is the new pump shaft wrong. Seems unlikely that it would be incorrectly manufactured so whats up?

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Thanks

 

 

Ian