Water pump problem. Anyone have a clue? - Team Camaro Tech
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post #1 of 17 (permalink) Old Feb 14th, 07, 07:34 PM Thread Starter
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Water pump problem. Anyone have a clue?

Driving along, and all of a sudden, the car starts squeeling.

Pull over and determine the sound is coming from the water pump.
Still pumping, and not getting hot, so I go straight home, and remove the pump. (after cool down)

When I take off the back cover of the WP,
I can see that the impeller has slid forward, and is scraping on the casting.
This "326"pump has less then 25 miles on it, and was just rebuilt by cardone.

Is it a faulty rebuild. or is there something else that would cause this?

It is a 350 HP corvette, with A/C.
And I must say, I was VERY MUCH "on it" when this happened.

Last time I changed this pump, I noticed (Assemb.manual) that there were 2 little washers missing form the A/C compressor bracket.
These 2 washers brought the A/C compressor pulley forward 1/64th"
Would that be enought to pull the WP shaft pulley forward?

I would think NO, but has anyone ever heard of this problem???

Installing a back-up 326 tonight.
Is this going to happen again, or was it just a bad pump bearing?
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post #2 of 17 (permalink) Old Feb 14th, 07, 08:12 PM
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Re: Water pump problem. Anyone have a clue?

I had a Corvette years ago that was going through water pumps. A defective fan clutch was the culprit. The fan would vibrate at high speed and would destroy the pump bearings. I went through several pumps before I figured it out.

Over-tightening the belt will also wreck a new pump.

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post #3 of 17 (permalink) Old Feb 14th, 07, 08:26 PM
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Re: Water pump problem. Anyone have a clue?

is this a gm or a local autoparts pump?
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post #4 of 17 (permalink) Old Feb 14th, 07, 09:27 PM Thread Starter
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Re: Water pump problem. Anyone have a clue?

No -- brand new GM NOS clutch
Changed fans too.

All rebuilt original GM pumps.
The next one I just installed tonight is no good either
Has pin holes in the back cover that are leaking out.

I am starting to think that this is all just shoddy workmanship.
No one really will rebuild the whole thing - they do whatever they think they can get a way with...
and they don't test them when they are done to be sure they are fixed.

Now I know what i am doing AGAIN this weekend.

I tighten all my belts by hand.
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post #5 of 17 (permalink) Old Feb 15th, 07, 03:48 AM
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Re: Water pump problem. Anyone have a clue?

Any auto parts store worth their weight will exchange a faulty part within a year free of charge, even GM does.

As for rebuilding a pump, check www.hemmings.com under water pump services and there are several private rebuilders. If you can get a Stewart pump, you're ahead. They use a curved vane impeller verses a straight vane, flows more fluid.

As for the backing plate, keep the thick steel plate, 1/16 inch, one verses the stamped steel plate. Only six bolts hold it on.

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post #6 of 17 (permalink) Old Feb 15th, 07, 05:49 AM Thread Starter
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Re: Water pump problem. Anyone have a clue?

I thought about an aftermarket WP a lot in the last 24 hours.
But the car is a National level award winning Corvette,
I really must use the correct pump.

Yes, I know about all the other rebuilders -
this has happened before (on other cars) That those rebuilt pumps don't last.
So, I thought the Commercial rebuilder would be better. NOT.
I guess it depends what condition WP, you are starting out with???

I am going to remove this one, and switch out the faulty backing plate.
It should be good.
It just really sucks - not as easy to remove the pump on an A/C car.
And it is a messy job draining all the fluid AGAIN.
I really do have better things to be doing with my time.
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post #7 of 17 (permalink) Old Feb 15th, 07, 08:44 AM Thread Starter
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Re: Water pump problem. Anyone have a clue?

OK pulled the WP again - just what I thought -- SHODDY WORKMANSHIP.

The back cover was so pitted on the inside, it was failing.
Switched the covers with the other bad pump, and "at this point" ...
Looks like I am good to go.

The first pump has this cheap impaler, no wonder it is crap. thanks a lot Cardone
The second one appears to be rebuilt right,
but they just looked at the back cover and said "it will work"

No one cares about quality anymore.
I guess that is what you get for a $75 WP commercial rebuild?

Might be my fault a little?- this cars sits too much.
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post #8 of 17 (permalink) Old Feb 15th, 07, 09:28 AM
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Re: Water pump problem. Anyone have a clue?

Quote:
Originally Posted by Pacecarjeff View Post
But the car is a National level award winning Corvette,
I really must use the correct pump.
I apologize. I apparently didn't read this from your first post.

Seems resources are slim.

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post #9 of 17 (permalink) Old Feb 15th, 07, 12:05 PM Thread Starter
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Re: Water pump problem. Anyone have a clue?

No problem - don't think i mentioned it earlier.
Anyways...
I just bought a few more back-ups from one of the Corvette supply houses.
The bad part is, that (I can only hope) by the time i need to use these -the warrantee is up.

Not cheap for the correctly dated Corvette ones.

It is really just so much easier to replace a part, when you have one ready to install.
So, I try to keep back-ups of everything I might need.
(better get some more water pump gaskets, since I used 3 sets this week)

Car needs to be ready for the Jay Leno's - Boca Raton, Concourse d' Elegance in 9 days.
I was personally invited to display.
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post #10 of 17 (permalink) Old Feb 15th, 07, 12:35 PM
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Re: Water pump problem. Anyone have a clue?

Cool ! I am having a friend of mine who is owning & running a restoration shop, looking for a reputable vendor to repair your dated w/p. He said another one was asking and had it done a month ago, but couldn't remember....CRS!

He's over 40 also.

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post #11 of 17 (permalink) Old Feb 15th, 07, 12:55 PM Thread Starter
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Re: Water pump problem. Anyone have a clue?

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He's over 40 also.
Now I feel SO much better.
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post #12 of 17 (permalink) Old Feb 17th, 07, 03:21 PM Thread Starter
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Re: Water pump problem. Anyone have a clue?

Blasted down the Highway - no leaks no problem.
Just 1 bad rebuild, and another bad back cover.

According to a high end rebuilder.
The pumps can only be rebuilt "so many" times.
The casting becomes worn, and the shaft will not fit snugly.

Takes a sepcial (expensive) rebuilder to fix them after that point.
The casting needs to be shimmed and welded to insure a tight fit.
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post #13 of 17 (permalink) Old Feb 17th, 07, 05:11 PM
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Re: Water pump problem. Anyone have a clue?

Jeff, there's only one guy I'd trust to rebuild any of my "numbers" water pumps - Arthur Gould, in Fort Salonga, New York, (631) 269-0093; he's done many for me over the last 15 years, and his work is flawless. 3-day turnaround, $65.00, and you get your own pump back. Most parts-store and commercial rebuilds are crap.


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post #14 of 17 (permalink) Old Feb 17th, 07, 06:18 PM Thread Starter
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Re: Water pump problem. Anyone have a clue?

Thanks John, Yes - I have used Arthur a few times.
Had one of his go bad a little quicker then it should have, a few years back.
I started looking for alternatives.
Will give him a try again.
Yes He is good. I still use him for my fuel pumps.

Was going to let Bill Mock have a try on this next one.
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post #15 of 17 (permalink) Old Feb 18th, 07, 11:14 AM
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Re: Water pump problem. Anyone have a clue?

Quote:
Originally Posted by Pacecarjeff View Post
The casting needs to be shimmed and welded to insure a tight fit.
Most out of round/worn bores have been fixed by drilling out the OE housing, pressing in a new bronze bushing/sleeve, then reaming to size. This way, the housing is reuseable for many lifetimes.

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