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Anonymous
Anonymous Posted on Dec 08, 2010
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Coolant coming out overflow. Can grooves in water pump shaft cause this?

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  • Posted on Dec 08, 2010
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No, the groves may alow water into the oil, past the seal, or even outthrough the leakhole in the pump housing, would check condition of the radiator cap, make sure it iss sealing ok not got corroded or contaminated inside the radiator where the cap seals, you dont say what bike it is my bigest thought on this if the pre mentioned is not the cause would be the head gasket has failed,forceing presure into the system and pushing the water out, but without seeing the bike my advice would be to do a compresion test to eliminate this.

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  • Anonymous Dec 08, 2010

    1984 cr250 i do have water in the oil, new rad cap, oversized piston, new oversized head gasket, cylinder head and cylinder shaved, , torqued to 20foot pounds

  • Anonymous Dec 08, 2010

    hi, the water in the oil may be passing the seal in the waterpump, ie the problem with the worn shaft may also contribute, did you have the issue with the water leak before you removed the head to do the rebore etc? i am thinking maybe a small leak in the cylinder, check for any microscopic cracks or pitting, is this the corect cap, is the water pump actualy turning when the engine is runing

  • Anonymous Sep 28, 2011

    i replaced the cylinder with a new one. new piston gaskets still leaking out overflow when i goose it. could it be that the cylinder head might have a microscopic crack in it. i had the head shaved in the past i believe it is true. water pump circulating coolant . correct (new) rad cap. rads flushed

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3.3L & 3.8L Engines To Remove:
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When installing the pump, make sure that the O-ring is properly seated in the groove in the pump body (3.3 and 3.8L engines) 91153g22.gif

To Install:
  1. Install a new O-ring into the water pump groove. Install the pump onto the engine. Tighten the mounting bolts to 108 in. lbs. (12 Nm).
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  6. Reconnect the negative battery cable, run the vehicle until the thermostat opens, fill the overflow tank and check for leaks.
  7. Once the vehicle has cooled, recheck the coolant level.
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