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Old 03-25-2004, 01:16 PM
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Red face Water pump question


I've been everywhere looking for the specifications for a chevrolet short water pump, and I cant seem to find anything at all. Can anyone tell me where to find the exact sizes of all the fittings, inlet/outlet, (AN/NPT?)etc... for a chevy water pump? Or if anyone knows them off hand? Im most concerned with the plug on top of the water pump. Although the rest of the measurements would be just as helpful. Thanks.

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Old 03-25-2004, 02:06 PM
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Sorry

Sorry, I do not know the specifications you request. But what is driving the question. Might be able to help there. I believe that is a standard 5/8 pipe plug. But so what?

hr41pearl
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Old 03-25-2004, 02:15 PM
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I have a morso expansion tank, and Im looking for the connections to connect the tank to the water pump and the tank to the radiator. And I dont want to waste time/money buying wrong parts... nothing major.

...and the other measurement were just for future reference.
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Old 03-25-2004, 02:39 PM
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Expansion

The pump would pump water directly into the expansion take, so I dont think you want to do that. The expansion tank is connected to the radiator. Fluid is pushed out to the tank when hot and as it cools, it is pulled back into the radiator. The radiator cap should be what they call a sealed cap. The pump pulls water from the bottom of the radiator through the BIG hose. Water returns to the radiator through the THERMOSTAT housing on the intake manifold. That leaves only two other fittings. They go to and return from the heating unit inside the vehicle. Some people use the large plug as a temperature fitting. How cool is the water being returned from the radiator.

hr41pearl
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Old 03-28-2004, 09:29 PM
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Thats the 'overflow' tank that you're describing...

The tank I purchased is an 'expansion' tank, that basicly just holds more coolant.

It has 3 fittings on it, a 1/2" NPT (on the very bottom of the tank), 1/4" NPT (on the top left), and a 1/4" slip fit (as part of the top), and then it has a top that requires a radiator cap (pressured).

In the directions for the tank, it says to connect the 1/4" hole to the top of the water pump where it is pluged. The 1/2" hole is supposed to be connected to the radiator on the same side as the cap. And the slip fit is supposed to goto an 'overflow' tank.

However, Im not sure the exact size of the plug on the water pump.
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Old 03-28-2004, 10:24 PM
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The hole at the top of MY short water pump is 1"- 14 UNS thread(=1/2" pipe thread), I think. I used a Motormite (HELP) fitting to adapt it to a 5/8 heater hose, part #56359. Hope that helps!

Last edited by OddRodder; 03-29-2004 at 02:02 PM.
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Old 03-29-2004, 09:15 AM
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EXPANSION

OK. Please excuse my ignorance. The word EXPANSION. This tank doesn't work on the water heating and expanding out into this tank? Does your expansion tank hold extra coolant and circulate it? Very curious tank. Where did you get it? How much did it cost and what is its primary function?

Not trying to be a smart ..., just interested in any new technology. Old dogs do learn new tricks, despite the rhyme.

hr41pearl
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Old 03-29-2004, 02:20 PM
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Sorry about the confusion

My ignorance also...

After looking around a bit more I found alot of articles calling the 'overflow' tank, an expansion tank in a different sense of the word.

I ment expansion as, in addition to. Not as, fluid expanding, as you just stated. Sorry about the confusion.

Its summit's P/N MOR-63650 or P/N MOR-63651. (moroso)
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Old 03-29-2004, 03:22 PM
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Interesting

Thank you for the response. So, the device provides no real cooling, just a way to get air bubbles to rise out of the system. Also an alternative way to fill the radiator on cars where the radiator is hard to get at. But I still would not connect it to the top of the water pump. It seems that the pump would push air up through the hose and splash fluid all over the place. Interesting.

If you get the change, post a picture after you are done.

hr41pearl
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Old 05-02-2004, 07:34 PM
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...Was asked for pictures

Finally got it all together.
Ended up being 1/2" NPT, as said.

Here are the pics: (taken at night, sorry)



I took out my heater core, since summer is comming and I didnt see any immediate need for it, and it made routing the hoses much, much easier. The way I have it routed is it comes from the outlet of the intake where the heater core got its coolant from, and goes into the top left of the tank. The bottom of the tank has a hose that goes into the top passenger side where the heater core returned its coolant to. I ended up keeping the water pump plugged up instead of using it, per the directions of the tank. And for right now, the overflow of the tank and the overflow of the radiator are connected with a hose. I have them in rubber right now, when I get money again, Ill put everything back with braded lines like I had it. When winter comes back, Ill have to rethink it all, or get another car that is still together. Thanks for the help though!

Last edited by arch; 05-02-2004 at 07:34 PM.
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