Re: Fan replacement
Do not overlook the thrust collar thats is installed on the shaft at the very front of the pump. It is an upgrade to prevent back and forth movements of the water pump shaft. The back end of the shaft rubs against an embossment in the cylinder head when the engine idles. After many years of rubbing the shaft develops too much forward and backward motion, which can lead to a leak, even with a new pump. This is why major dealers offer a slightly longer water pump shaft as one cure, or the thrust collar as an optional cure when using a standard length shaft.
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