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Old 09-16-2014, 09:57 PM   #1
Ian Curtis
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Default Axial Play in Water Pump Shaft

Hi All,

This previous weekend I went in a 130 mile round trip journey, which is far & away the most I've driven my truck. Made it to the destination & back with no issues, but when I parked the truck there was a serious drip out of the packing nut. It's always dripped a little, so I squeezed in some grease and tightened it a bit and walked away, but a half hour later there was a sizeable puddle on the floor with maybe a drip per second coming from the block. I eventually discovered that if I pushed "in" (towards the block) the shaft moved between a 1/16 and an 1/8 of an inch & the leak stopped.

Is this a sign of something more serious, or do I need to just tighten the packing nut until it stops dripping or replace the packing?
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Old 09-16-2014, 10:37 PM   #2
Drive Shaft Dave
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Default Re: Axial Play in Water Pump Shaft

The end play should be held to .006, There is a collar that the vendors sell that fits behind the fan ,held by a set screw. The boss inside the head that is used to control the end play is worn down. There are other ways to fix this but the collar is probably the simplest.
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Old 09-17-2014, 12:35 AM   #3
Chuck Sea/Tac
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Default Re: Axial Play in Water Pump Shaft

You probably need to repack the pump, and maybe replace the shaft, to stop the leaking, and install the collar to prevent movement.
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Old 09-21-2014, 06:17 AM   #4
billybronco1
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Default Re: Axial Play in Water Pump Shaft

I need to understand this pump end play more. My pump does not leak for short rides and not sure about long rides because I have not done that yet. I have almost a half inch end play if I slide the shaft back and forth. This does not seem right and I need to know what to do.

Also the car has a six volt alternator and I was wondering how much play should be in the fan belt - thanks
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Old 09-21-2014, 07:06 AM   #5
Ed Saniewski
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Default Re: Axial Play in Water Pump Shaft

The collar will keep the shaft from sliding back and fourth,so it will keep the shaft at the pulled out toward the radiator. Ian, if you have to push in on the shaft to stop the leak, try tightening up the packing just until the leak stops. Do not over tighten it or you will score the shaft. If it still leaks then do as Chuck said and replace the shaft. Some one prior probably over tightened it and scored the shaft.
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Old 09-21-2014, 12:17 PM   #6
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Default Re: Axial Play in Water Pump Shaft

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Where does one buy this collar do you have a part number?
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Old 09-21-2014, 11:22 PM   #7
Bill Cilker
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Default Re: Axial Play in Water Pump Shaft

Do not use the collar if you are running a plastic fan with the steel hub. There is not enough room between the water pump housing and the steel hub when it is seated properly on the shaft.
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Old 09-22-2014, 05:32 AM   #8
Ed Saniewski
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Default Re: Axial Play in Water Pump Shaft

Here is a link to Brattons

WATER PUMP SHAFT COLLAR
For Year(s): 28-31

Before installing the fan on the shaft, slide the teflon washer followed by the steel collar up to the front of the pump housing. Use the set screw to secure it in place. This will eliminate all the shaft endplay, which can disturb the packing causing a leak. Collar will not be seen when the fan is installed. Set includes teflon washer steel collar and set screw. This collar will not work on the repro 6 blade fan.

Part #12500
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Last edited by Ed Saniewski; 09-22-2014 at 05:38 AM.
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Old 09-22-2014, 05:39 AM   #9
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Default Re: Axial Play in Water Pump Shaft

Let's try this
http://www.brattons.com/uploads/imag...arge/12500.jpg
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Old 09-22-2014, 10:03 AM   #10
Ian Curtis
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Default Re: Axial Play in Water Pump Shaft

Quote:
Originally Posted by Ed Saniewski View Post
The collar will keep the shaft from sliding back and fourth,so it will keep the shaft at the pulled out toward the radiator. Ian, if you have to push in on the shaft to stop the leak, try tightening up the packing just until the leak stops. Do not over tighten it or you will score the shaft. If it still leaks then do as Chuck said and replace the shaft. Some one prior probably over tightened it and scored the shaft.
Ed, is that your Piet in your profile picture? Cool shot either way!

On further inspection, I think the problem was me. I believe I thought I was tightening the packing nut and I was actually loosening it and had backed it off 1/2 a turn. Properly tightened and not leaking now...
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Old 09-22-2014, 01:05 PM   #11
Russell in Tulsa
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Default Re: Axial Play in Water Pump Shaft

Yes, Righty Tighty, Lefty Loosey.
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Old 09-23-2014, 01:47 PM   #12
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Default Re: Axial Play in Water Pump Shaft

Okay I plan on buying this collar looks like an easy fix for shaft end play - thanks. My car has a six volt alternator running an A8620 belt. The alternator is adjusted out all the way and I still have quite a bit of slop in the belt maybe 2". First how tight should this belt be and should I get the next size shorter belt if there is such a thing or a longer adjustment arm on the alternator?
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Old 09-23-2014, 01:50 PM   #13
stewwolfe
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Default Re: Axial Play in Water Pump Shaft

Alternators don't like loose belts. You should go with a shorter belt.
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Old 09-23-2014, 02:30 PM   #14
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Default Re: Axial Play in Water Pump Shaft

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Originally Posted by stewwolfe View Post
Alternators don't like loose belts. You should go with a shorter belt.
I do realize that on today's conventional cars but I was concerned on over tightening and the effect of premature wear on the water pump shaft bearing.

Has anyone used a smaller belt there is more to it then just the length - What would the part number be for a 1" shorter A8620 if there was such a thing?
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Old 09-23-2014, 03:16 PM   #15
CarlG
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Default Re: Axial Play in Water Pump Shaft

I use a cogged belt such as BX40. Seems to grip the smaller alternator pulley with less tension than the solid belt does.
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Old 09-23-2014, 04:37 PM   #16
billybronco1
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Default Re: Axial Play in Water Pump Shaft

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I use a cogged belt such as BX40. Seems to grip the smaller alternator pulley with less tension than the solid belt does.
I assume a BX40 has a total length of 40" is that correct? Is that the actual part number?
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Old 09-23-2014, 04:56 PM   #17
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Default Re: Axial Play in Water Pump Shaft

Quote:
Originally Posted by billybronco1 View Post
I assume a BX40 has a total length of 40" is that correct? Is that the actual part number?
Goodyear Engineered Products Torque-Flex V-Belt, BX40, Cogged, 0.66" Top Width, 0.41" Height, 40" Approx. Inside Length (NAPA has their own part #, but just ask for BX40)
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File Type: jpg BX40 Belt.jpg (20.8 KB, 6 views)
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Old 09-23-2014, 05:01 PM   #18
billybronco1
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Default Re: Axial Play in Water Pump Shaft

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Goodyear Engineered Products Torque-Flex V-Belt, BX40, Cogged, 0.66" Top Width, 0.41" Height, 40" Approx. Inside Length (NAPA has their own part #, but just ask for BX40)
Okay great I found the web site I need something a little shorter and they have a BX39 that is 1" shorter, should do the trick.
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Old 09-24-2014, 06:50 AM   #19
billybronco1
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Default Re: Axial Play in Water Pump Shaft

Can the fan blade be removed with out removing the radiator and then install the collar it looks pretty tight in there?
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Old 09-24-2014, 07:37 AM   #20
Joe K
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Default Re: Axial Play in Water Pump Shaft

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Originally Posted by billybronco1 View Post
Can the fan blade be removed with out removing the radiator and then install the collar it looks pretty tight in there?
Generally not due to the extended length of the pump shaft (which is nearly to the backside of the radiator.)

Although one might try to play a game of undoing (somehow) the upper radiator hose connection and prying the radiator forwards to gain additional clearance. You may end up with the radiator split in pieces though. An outright removal is probably best.

Of course if the radiator is removed - then one is free to install an "ultimate" pump which, which it's cartridge/forward bearing, needs no attention to free play (it's built in.) Or even do an extended shaft/cut down to fit pump rebuild.

In a lot of ways I consider the plastic donut a "temporary fix" - and one I might not normally choose to do on that account. But given a choice between driving and not driving - it would be an easy change of mind for me to install. And I would be encouraged by others success with this option.

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