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Original Message
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| water pump impeller-to-housing clearance |
| By ed pascoe - 01/10/2005 6:55:08 AM; IP 65.54.98.16 |
I purchased a remanufactured water pump (D7TE-AA) for my 351 clevland. The impeller vanes measure 3.90" in diameter, and the housing cavity measures 4.45" at it's most narrow diameter. The impeller's centrifugal working clearance is thus greater than a quarter inch. It just simply appears to be too great of a clearance for proper development of a hydraulic pumping action - at least during a low RPM idle.
The engine would typically overheat in warm weather, and finally developed a hairline crack across the cylinder #8 valve seats on a new rebuild.
The impeller cycles fluid because it can be seen through the radiator cap opening, but apparently its not sufficient in fluid volume to continue cooling emediately after a hard run (eg: freeway drive).
If anyone has a remnant 70's ford waterpump lying around, could you please measure the clearance between the tip of the impeller vane and the closest inside circle clearance of the waterpump housing cavity edge in response to this posting - or e-mail: edpascoe@msn.com to advise me of the measurement you have found.
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