Posted by NCWayne on July 23, 2014 at 14:27:34 from (173.188.169.54):
In Reply to: Re: Water pumps posted by ShadetreeRet on July 23, 2014 at 11:37:06:
In every instance I know of, as far as the water pump, your right, the seal needs cooling, not lubrication. Now if you've got a diesel with O-rings sealing the liners, etc, then it may have properties that will help keep the material in the O-rings pliable, and it may do the same for the material in some seals, but as far as actual lubrication, there is none needed.
Too, your right, most water pumps are running sealed bearings, and the seal keeps the fluid away from them. In fact most water pumps have a weep hole in the cavity between the bearings and seal so if the seal does leak, it won't wash out the bearing. This way you can run the engine long enough to get it to the repair shop, etc, as long as you keep water in the system to make up for the leak, without the risk of the bearing going out on the way. That said, what I have seen more often than not is the seal leaking is secondary to the bearings going bad. Basically the shaft looses square with the rest of the housing/the bore. As a result the moving part of the seal is no longer square with the fixed part of the seal, and it begins to leak.
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