25 hp nissan quits pumping water after it warms up

by Louis Goss
(ste. marie il)

Hi! Folks im having a little water pump problem my 1991 MC2 NISSAN 25HP Pumps water fine for bout 2 min till motor warms up then it just quits peeing have replaced whole pump ,all o-rings ,rubber gromets ,base gasket ,head gasket, thermostat and still same problem ! Any ideas ? Took off thermostat housing and its not even pushing water up to thermostat! Have blowed out all passages ports and tubes I'm stumped any help appreciated

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