Usually indicates that water is leaking past piston seals into oil of crankcase. Remove oil plug and check for gray foamy oil in crankcase. If oil looks normal (compare to motor oil) oil may be entering pump chamber (not very likely due to high pressure, generally water will be forced into crankcase). If foamy oil is found, time for reseal kit or replace complete pump.
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Usually indicates that water is leaking past piston seals into oil of crankcase.
Remove oil plug and check for gray foamy oil in crankcase. If oil looks normal (compare to motor oil) oil may be entering pump chamber (not very likely due to high pressure, generally water will be forced into crankcase). If foamy oil is found, time for reseal kit or replace complete pump.