89vette

Here is my original thread...
https://www.corvetteforum.com/forums...-65-365hp.html

I had the original water pump rebuilt locally because I wanted the correct 1/2" bypass. I took the car for a ride and I had a terrible vibration and after 2 miles, the water pump failed and coolant was leaking out. You can move the fan a lot so it must have took out the bearings.

I've had a vibration in the motor at higher RPM's that must be related to the pump, pulley or fan. When I replaced the pump I replaced the fan clutch as well. The pulley showed a wobble when it spun like it wasn't sitting correctly on the water pump shaft. Like I said after the rebuild, the vibration was pretty bad. I ordered a new pulley that is almost $300.00 and I think I'll replace the fan as well.

I plan on also putting on a replacement water pump and using a bushing for the bypass elbow and then sending the correct one to Bill Mock for another rebuild (he did not do it the first time).

I just wanted to share my pain and frustration. Thanks for reading!

89vette

I talked to Bill Mock about rebuilding my pump and come to find out that he used to own my car over 30 years ago! He remembered it well and has a picture of it on his wall that he is going to scan for me. Small world!

Mossy66

I messed up a couple of water pumps. I found that the bushing that is included to center the fan clutch on the water pump is a bit too short to mate up with the water pump shaft, so it wasn't working as intended. The fix was to drop a couple of washers in behind the bushing to bring the bushing flush with the edge of the fan clutch so that it mates with the shaft on the water pump.


Gerry

Pilot Dan

Are you sure the pulley is the problem and not the pump mounting flange? I have seen some rebuilds that bend them in the repair process. The good rebuilds will either replace or turn the mounting surface on a lathe to insure straightness. Check it out, you might save yourself $300

Just saw your other post, bummer on the pump but, your pulley may still be fine.

mgr40021

I found hairline cracks in my water pump pulley as well. Most water pump flanges are not perfect and neither is the pulley. I mounted the new pulley to the pump in all four locations checked it with a dial indicator and mounted it in the position with the least amount of runout. The price for the right pulley is high but like you I wanted the correct part.

89vette

Yes I will check the alignment of the old pulley and new pulley before assembly. I ordered a rebuilt pump from Chicago Corvette that is supposedly an unsleeved correct 1/2" NPT undated 326 pump. We will see when I get it.

vetsvette2002

Oh no
hope they had it IN STOCK......

Don

89vette

Supposed to ship today so we will see.