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Username Post: 36 water pump leak        (Topic#359412)
"13th Year" Gold Supporting Member
Posts: 2307
Loc: Vacaville, CA
Reg: 02-19-04
01-08-20 09:10 AM - Post#2783986    

The fan shaft out of the water pump on my stock 36 is leaking. I was told to tighten the nut a little until it stops leaking. I did that and now it squeals at idle. So, do I replace the water pump, or is it possible to replace the packing around the shaft, and if so, with what?
thanks, Ken

36, 38 & 39 2dr sedan, 41 coupe, 54 convertible, 56 Nomad, 57 210 2dr sdn, 70 Camaro RS, Corvettes; 57, 61, 65 396 coupe, 67 427 convert, 72 T-top, 88 coupe,91 ZR-1, 07 Z06, 16 Z06, 07 Silverado, 09 BMW 135i vert.


Ray P W 
Posts: 524

Reg: 09-30-15
01-08-20 09:35 AM - Post#2783989    
    In response to bowtiefan

Good morning Ken.

The nut you tightened compresses the packing against the shaft. If the packing is all used up some needs to be added. I've had the same '36 Chevy PU since 1965 and I've never replaced the water pump. To keep it working without leaking I add some packing once in a blue moon, put a few drops of motor oil in the oiler at the front of the water pump, keep grease in the grease cup on the driver's side of the water pump and give the grease cup cap an occasional turn to force in some more grease.

If you'd like to see what that packing material looks like I have some from "back in the day" that, as I recall, is graphite impregnated asbestos made just for this purpose.

If you give me your email address I'll send you a photo of that stuff.

Ray W


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