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Water pump spins REALLY easily. . .Is it okay? 700

posted by  N7SC on  Tue Mar 15 04:57 CST 2005
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last visit: Sun Jul 7 14:12 CST 2013
[RELATED]

When I took the belts off to see if my timing belt had slipped, I noticed that the water pump spins really, REALLY easily by hand. In fact it even keeps turning for a few seconds after being given a twirl by hand. This is not what I expect from a shaft whose other end is supposed to be immersed in coolant solution. I'd expect the coolant to damp the motion of the pump pretty thoroughly.

Could it be that the shaft is broken or the impeller has slid off of the pump or something?

Might I have found the cause for why it seems like it is not running on all four cylinders? If you are not familiar with that pair of threads, the urls are

The original post:
http://www.brickboard.com/RWD/index.htm?id=932204&show_all=1

The first follow-up
http://www.brickboard.com/RWD/index.htm?id=932491&show_all=1

It has never given any indication of overheating, and the heater works pretty darn well, if not spectacularly. But if it is not circulating, then maybe the head overheated and warped in the middle. With my luck, that is probably just what happened.

Am going out to the car now to do the compression checks mentioned in the above threads. Will post results when available.

Thanks again everyone.

--
Scott Cook - 1991 745T, 1985 RX-7 GSL-SE, 1986 Toyota Tercel (Don't laugh, it is reliable, faithful AND gets 41 mpg!)








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    Water pump spins REALLY easily. . .Is it okay? 700

    posted by  c_j_mooney on  Tue Mar 15 05:07 CST 2005
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    last visit: Wed Sep 14 17:39 CST 2011
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    Not likely a sign of catastrophic water pump failure, just fair warning that yours has been on the car for a while. If the impeller had come off the shaft, or the shaft had broken, your symptoms would be drastic overheating & clouds of steam given more than a few minutes' operation. Is there any lateral play in the pump bearings - can you rock the pump back & forth at all? And you didn't mention if this is with the fan still in place or not. If it's installed, this is normal. If you've removed it & are just spinning the flange and it moves freely, this indicates that the seals aren't as tight as new. Still not cause for alarm unless 1) there's play or roughness in the bearings, 2) there's any sign of coolant seeping around the shaft or weep hole on the pump, or 3) you know it's been on there for 150k+ miles. If you're already changing the timing belt, or doing similar work at the front of the engine then now is the time to replace the pump if it's suspect.
    -Chris








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      Water pump spins REALLY easily. . .Is it okay? 700

      posted by  N7SC on  Tue Mar 15 05:13 CST 2005
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      last visit: Sun Jul 7 14:12 CST 2013
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      Chris,

      Thanks for the quick reassurance. Makes me feel better. There is some, probably minor seepage from the bottom weep hole. Good to know it was still doing its job. But given seepage, very slight bearing "feel" (way too slight to call "roughness" yet), and, as you point out, that I'm in there already, a new one will go on.
      --
      Scott Cook - 1991 745T, 1985 RX-7 GSL-SE, 1986 Toyota Tercel (Don't laugh, it is reliable, faithful AND gets 41 mpg!)








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        Water pump spins REALLY easily. . .Is it okay? 700

        posted by  Garyh on  Tue Mar 15 07:21 CST 2005
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        last visit: Sun Apr 15 11:44 CST 2012
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        I have a new one for my 740 that will go on this week. It has 240,000 miles on it, just to let you know you can get mileage on them before they crash and burn. Not that I recommend you don't change it. I bought mine in anticipation of a problem and finally getting some leakage.







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