Author Topic: upper water pump pully.  (Read 2137 times)

pjbizjak

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upper water pump pully.
« on: May 30, 2018, 12:26:48 AM »
I recently purchased a new 2 grove upper pully for my 1968 z/28 302 motor part # 3770245, and when I put it on the back side rubs the water pump #3859326 and the pully groves don't match up. The pully needs to come forward about 1/8" - 3/16". does anyone make spacers for this problem? I suppose I could fabricate something out of 1/8" or 3/16" steel plate.

pjbizjak

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Re: upper water pump pully.
« Reply #1 on: May 30, 2018, 12:34:11 AM »
Stop, I answered my own question, yes the do make shims for this problem, ordered a 3 shim set on ebay.

z28z11

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Re: upper water pump pully.
« Reply #2 on: May 30, 2018, 01:35:20 AM »
Napa has them, too -

What water pump casting are you using ? Z pump has a longer shaft height, remember -

Regards,
Steve
1968 Z28 M21/U17 BRG/W 1967 Chevy ll Nova SS 
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06  1949 3100 5wd 235/6

pjbizjak

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Re: upper water pump pully.
« Reply #3 on: May 30, 2018, 08:53:17 PM »
3859326 supposed to be the right pump.

z28z11

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Re: upper water pump pully.
« Reply #4 on: May 30, 2018, 11:14:10 PM »
GM pulley, or reproduction ? Reason why I ask, I have the same setup, read on another thread that there is a reinforcement required that would likely make up the 1/8" difference you are seeing, supposedly in the AIM. Hub height for the 326 should be 5-11/16".

Just trying to prepare for the eventual restoration routine - I hate mismatched pulleys and thrown belts.

Regards,
Steve
1968 Z28 M21/U17 BRG/W 1967 Chevy ll Nova SS 
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06  1949 3100 5wd 235/6

pjbizjak

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Re: upper water pump pully.
« Reply #5 on: May 31, 2018, 12:42:44 AM »
I believe it's repop with the correct part # embossed in it.

 

anything