When changing the water pump on a 2001-2005 Duramax Diesel engine, examine the water pump cover. If it shows signs of cavitation, it should also be replaced.
A new ACDelco water pump cover for the 2001-2005 Duramax Diesel is now available, part number 97228188. (Fig. 15) It does not include an O-ring.
(Fig. 15)
Two available ACDelco water pumps include an OE water pump, part number 251-723, or an aftermarket water pump, part number 252-838.
Cavitation Damage
Cavitation is the process where a bubble in a liquid (usually caused by the pressure of the liquid falling below its vapor pressure) rapidly collapses, producing a shock wave. The shock wave is strong enough to cause damage. (Fig. 16)
(Fig. 16)
Possible cavitation is most likely at the impeller blade of a pump, where flow rates and turbulence may be high. Cavitation can cause vibration and noise as well as pitting erosion and additional wear. The pitting accelerates the erosion because it increases the turbulence of the fluid flow, which creates more cavitation and, eventually, may lead to pump failure.
- Thanks to Matt Gibbard
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