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post #1 of (permalink) Old 06-18-2003, 01:39 PM
bmwfirearms
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How to tell water pump rotation

How can you tell if the rotation on a water pump is correct while running? besides (over heating, Taking off and looking at it).

Would you still get some movement in the radiator (looking in with cap off)?

Hoses full of air?
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post #2 of (permalink) Old 06-18-2003, 02:28 PM
 
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Re: How to tell water pump rotation

Does it have regular belts or serpentine?
I'm trying to picture in my head if it would be possible to have a reverse rotating water pump with v-belts and I'm thinking it's not.
I would *think* that if you bought a v-belt water pump for your engine that it would have to be made to rotate in the proper direction.
If you have serpentine belts than its another story. They can be bought in reverse or regular rotation depending on your belt routing.
I also think that the reverse rotating ones are clearly marked with an "R" somewhere on the casing.
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post #3 of (permalink) Old 06-18-2003, 02:47 PM
bmwfirearms
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Re: How to tell water pump rotation

It is a V belt....

i dont think you can tell the difference from the outside.

I believe my problem is this new water pump i got or trapped air in the system.

What signs would their be if rotation was backwards?

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post #4 of (permalink) Old 06-18-2003, 03:13 PM
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Re: How to tell water pump rotation

1. You've got a downflow radiator,
2. Coolant should flow from the top tank downward to the bottom tank.
3. So if the thermostat's open,
4. And you were able (careful, it's hot!) to look in the radiator,
5. You'd see coolant traveling from the Upper Radiator hose,
6. Into the radiator.
7. To confirm it...
8. Pull the thermostat and see which way the coolant's flowing,
9. With a safely cold engine.
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post #5 of (permalink) Old 06-18-2003, 05:35 PM
 
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Re: How to tell water pump rotation

If you have v-belts it means you need a regular rotation pump. Serp belts means a reverse rotation pump. You need the reguar rotation.

Why do you ask? I assume you are overheating. Did you recently replace the pump in hopes of curing an overheating problem? It could be a multitude of things. Post back with more specifics and we'll do our best!
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post #6 of (permalink) Old 06-18-2003, 09:06 PM
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Re: How to tell water pump rotation

ok, I have confirmed today that i DO have the regular rotaion water pump (V drive belts).

I replaced the water pump when i replaced the timing chain, since i had it off out of my way...the old saying "if its not broke dont fix it" is haunting me now.

The reason i think i have a problem now is that my block, and head got extremely hot, hotter than normal, so i checked inside of the radiator and did not see any flowing coolant, I then squezzed the hoses and they feel empty (no water).

After verifying that i had the right pump (rotation) i started it up again today with the cap off, again, everything seemed to get sizzing hot, i checked the coolant and it was hot also (not near as hot as the block & head). Then while it was running, i pulled the top hose off of the radiator (safely out of the way). coolant did come out of the hose with very mild pressue.

I now feel maybe the propeller design isnt pumping the water hard enough?

OR

I may be just watching it closer than normal since i just replaced the pump.

I am going to drive it around tommorrow to work about 4 miles and see what happens.




post #7 of (permalink) Old 06-18-2003, 09:30 PM
 
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Re: How to tell water pump rotation

Two ways-first the fan should be blowing air across your motor, not into the radiator. Second look at the pump. It sucks from the inside of the impeller and "slings" it out the outside end. All pumps do this. The suction on the inside of the impeller is from the lower radiator hose and the outside goes into the block-you just can't see it. On my 304 while looking at it from the radiator, it turns clockwise. Most engines are this way also.
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post #8 of (permalink) Old 06-18-2003, 10:23 PM
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Re: How to tell water pump rotation

1. Your symptoms are more akin to a bad thermostat....
2. It's falky, not opening when needed.
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post #9 of (permalink) Old 06-18-2003, 11:14 PM
Swansonoldcj
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Re: How to tell water pump rotation

As I said last nite, i6 jeep engines take quite a while for the t stat to fully open, due largly to the heater inlets and outlets, and go to autozone or wherever and get a heavy duty robertshaw tstat(very controlled action, excelent performance,I've run them in everything from zr1 chevys to pintos).Also be very careful when installing the stat that it stays centered in its recess, I've seen them shift just abit, not leak, but bind when they try to open...try driving it!cuase unless you have a infared temp gauge its hard to tell what is to hot!good luck again!gas. [img]images/graemlins/grin.gif[/img]
post #10 of (permalink) Old 06-30-2003, 11:37 PM
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Re: How to tell water pump rotation

try to jiggle the pump fan back and forth if it moves it is bad and needs to be changed.
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