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Old 12-02-2019, 09:57 PM   #1
n65ws@att.net
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Default water pump end play how to stop?

I just bought a 1929 Model A, and am having the engine rebuilt. I have found in taking the water pump off that the new fan on the shaft was loose, how do I tighten fan and get rid of end play?
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Old 12-03-2019, 02:07 AM   #2
Magicbox51
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Default Re: water pump end play how to stop?

Are you sure it was the fan on the shaft or is it play in the shaft in the water pump housing? If it is the shaft, which is REAL common, you can rebuild or buy a rebuilt water pump. However, a much cheaper fix is to buy a collar from any of the vendors.
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Old 12-03-2019, 04:36 AM   #3
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Default Re: water pump end play how to stop?

It is most likely just too much end play in the shaft. Try one of these https://www.snydersantiqueauto.com/P...l-a/water-pump
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Old 12-03-2019, 06:24 AM   #4
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Default Re: water pump end play how to stop?

Ditto #3
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Old 12-03-2019, 12:06 PM   #5
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Default Re: water pump end play how to stop?

Mine does the same thing, moves forward about 3/8".
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Old 12-03-2019, 12:21 PM   #6
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Default Re: water pump end play how to stop?

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Originally Posted by Synchro909 View Post
It is most likely just too much end play in the shaft. Try one of these https://www.snydersantiqueauto.com/P...l-a/water-pump
Trouble with these collars is you have to take the pump off and to pieces to fit the collar. I am sure I saw somewhere a two-part collar that could be fitted over the shaft without removing the whole thing. ( or try a small hose clip, -yes it does work!)

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Old 12-03-2019, 12:27 PM   #7
Kurt in NJ
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Default Re: water pump end play how to stop?

I drilled the head for a stainless pan head screw---- this way stock parts fit , no modifications needed
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Old 12-03-2019, 01:45 PM   #8
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Default Re: water pump end play how to stop?

I either use the longer water pump shaft and grind for at least six thousands clearance at the rear of the shaft where it meets inside the head . There is a collar that can be installed on the water pump shaft , behind the fan and the pump doesn't need to be disassembled .
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Old 12-03-2019, 07:28 PM   #9
Fred K OR
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Default Re: water pump end play how to stop?

Quote:
Originally Posted by n65ws@att.net View Post
I just bought a 1929 Model A, and am having the engine rebuilt. I have found in taking the water pump off that the new fan on the shaft was loose, how do I tighten fan and get rid of end play?
Sounds like you are talking about two possible problems here. If the fan is loose on the shaft, just tighten the nut on the end of the shaft that holds the fan on. If it is a shaft play, being you have the engine out (rebuilt engine) I would just put a new leakless water pump on it.
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Old 12-03-2019, 07:50 PM   #10
Chuck Sea/Tac
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Default Re: water pump end play how to stop?

What kind of fan did you get? It is possible the shaft and fan angles don’t match. Also on an aluminum two blade fan, you need a washer behind the nut to keep from biting into the aluminum and eventually coming loose and wallowing out.
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Old 12-04-2019, 01:33 PM   #11
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Default Re: water pump end play how to stop?

Quote:
Originally Posted by Fred K OR View Post
Sounds like you are talking about two possible problems here. If the fan is loose on the shaft, just tighten the nut on the end of the shaft that holds the fan on. If it is a shaft play, being you have the engine out (rebuilt engine) I would just put a new leakless water pump on it.
I second Fredís comment. If youíre getting the engine rebuilt, might as well get a leakless water pump and an aluminum two blade fan if you donít already have one. Cheap upgrades compared to the cost of rebuilding the engine.

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Old 12-04-2019, 06:13 PM   #12
aermotor
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Default Re: water pump end play how to stop?

Is there any type of repair to the stop block in the head it self? I have an old head laying around and it appears that some sort of flat bottom U shaped spacer would maybe work if the problem is caused by this.

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Old 12-13-2019, 03:56 PM   #13
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Default Re: water pump end play how to stop?

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Originally Posted by johnbuckley View Post
Trouble with these collars is you have to take the pump off and to pieces to fit the collar. I am sure I saw somewhere a two-part collar that could be fitted over the shaft without removing the whole thing. ( or try a small hose clip, -yes it does work!)
I purchase from a seller on ebay, and I believe Granger has them also that is a split collar. No removal of water pump! I am a lazy member!
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Old 12-13-2019, 04:43 PM   #14
David R.
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Default Re: water pump end play how to stop?

I just took the pump apart on my AA and it had a nice little two piece brass collar on the shaft behind the fan. The shaft and impeller, bushing etc.,. needs replacing but the roller bearing looks like new.
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