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Water pump change in 37?
#1346682 Sun Feb 16 2020 01:54 AM
Joined: Feb 2003
Posts: 1,355
J
Shop Shark
I thought I read that there was a water pump change in 37 and if it did happen did the water pump get longer or shorter,getting the new 235 ready to drop in my 37 and found what I think is a original fan which hits the balancer. There is only 1/4 inch between the fan and radiator with the present engine that has a 49 to 54 fan and I am trying to get a little more distance,found a fan off a 46 to 48 that has notches to clear the balancer but it has thicker blades that might put me back where it is now. Both engines are 55 to 62 235s with 54 water pumps with the adapter.

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Re: Water pump change in 37?
Jeff Ogden #1346688 Sun Feb 16 2020 02:44 AM
Joined: Jan 2018
Posts: 334
B
Shop Shark
I had my water pump nose and front of pulley machined down. Now have 1/2- 5/8" clearance.

Re: Water pump change in 37?
Jeff Ogden #1346725 Sun Feb 16 2020 03:24 PM
Joined: Feb 2003
Posts: 1,355
J
Shop Shark
I just remembered that when I had the radiator rebuilt I had a 4 row core put in so that might be parts of my problem.

Re: Water pump change in 37?
Jeff Ogden #1346782 Sun Feb 16 2020 10:58 PM
Joined: Sep 2011
Posts: 710
B
Shop Shark
Looks like you need an earlier balancer.


BC
1960 Chevy C10 driver 235 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
G.M dealer tech since 1980 & counting
Re: Water pump change in 37?
Jeff Ogden #1346804 Mon Feb 17 2020 02:53 AM
Joined: Feb 2003
Posts: 1,355
J
Shop Shark
It has a 54 balancer.

Re: Water pump change in 37?
Jeff Ogden #1346849 Mon Feb 17 2020 03:48 PM
Joined: Jan 2001
Posts: 4,965
P
Shop Shark
Your problem has me scratching my head.
In your first picture it looks like you are using a 16" passenger style fan. I have never seen one of those hit the balancer. In fact with a 1954 balancer, as you have, and my adapter with a 1953-54 pump the fan should be in the factory position.
There must be more to the story.
What am I missing?


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Re: Water pump change in 37?
Jeff Ogden #1346918 Mon Feb 17 2020 11:57 PM
Joined: Feb 2003
Posts: 1,355
J
Shop Shark
Balancer was not all the way in but the fan is now only a hair away from the balancer,going to get a 1/8 spacer made and use the black 16 inch fan. The rusty fan is 18 inches and what would it have came off of originally,I took it off a 46 to 48 car.

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Re: Water pump change in 37?
Jeff Ogden #1364801 Sat Jun 13 2020 08:27 PM
Joined: Feb 2003
Posts: 1,355
J
Shop Shark
Fan will still hit the balancer so going to clean up the 18 inch fan and see how it does.

Re: Water pump change in 37?
Jeff Ogden #1364951 Mon Jun 15 2020 06:08 AM
Joined: Feb 2001
Posts: 1,110
D
Shop Shark
That's weird .

Here are a couple of pics of my '54 235 in the '40. I used a new water pump from rock auto , it was 4mm longer than the original (I shortened it to fit), my fan is 18" and clears the balancer by about 3/8" . There is maybe less "set" on the blades than you have. There is no interference at all . It is very close to the radiator. Like you , I have also got more cores in the radiator.

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DSCF3131.JPG (280.29 KB, 77 downloads)
Last edited by Dusty; Mon Jun 15 2020 06:22 AM.
Re: Water pump change in 37?
Jeff Ogden #1365077 Tue Jun 16 2020 04:25 AM
Joined: Apr 2020
Posts: 35
9
Wrench Fetcher
Is it a re-pop pump? Is hub on shaft same as OE? If not move hub out on shaft W/press,remove back cover only need 1/4-5/16 of snout sticking out for fan!


Karl j Townsend
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