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Older mecury wont pump water

Hi i have an older mercury outboard 35hp twin i bought a new impeller for the water pump all the lines are clear and it still wont pump water is there anything else it could be thanx

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Never had a good water pump caviate. You may have a problem with your powerhead causing exhaust to enter the cooling system. This could be any thing from the head gasket beginning to fail, the exhaust cover plate and baffle having gasket or corrosion issues or even the powerhead base gasket or water tube "O" ring being rotted out from around the inlet pipe.

Before you do any of that-- pull the drive off the motor, drop it in a bucket of water and spin it with a big drill. If the key way is in correctly it should spit water vigorously out the outlet.

When you put it back on, put liberal grease in the pump outlet and check the "o" ring burried down that hole. Then find the tube guide and put it on the pump at the outlet. This will make sure the tube actually goes in the pump.

So now you are sure the pump works and the tube is in the pump, with this knowledge-go on the search for the real problem. I would first drop the exhaust plate off the side of the motor. Take the baffle to the wire wheel and clean the scale off it and hold it to the sun look for pin holes. Inspect the gasket areas for burn outs. If the gaskets are in good shape- leave them alone and put some sealer on the clean side. You can do more harm than good by scraping a perfectly good gasket.

Next would be pull the power head. This will give you a look at the water tube where you can check for pieces of old water pump. They get stuck where the water tube from the pump enters the power head base. Also see if the tube has been pushed up into the power head a blocked the water flow. If so just push it back into the pump.

Last is the head gasket. Just put in a new one. Look for burn outs and carbon tracts into the water jacket.

If none of this works- I don't know what to tell ya.

Posted on Jan 23, 2012

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When you install a new pump it will "cavitate" (pump air) unless you pack it with petroleum jelly.

Posted on Jul 29, 2010

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