Home › Forum › Ask A Member › Why is my HD25 overheating? › Re: Why is my HD25 overheating?
" I have taken the flush plug out and while its running it will dribble water."
Ok, so if everything is right with the pump, grommet, elliptical/pin, water pump housing, and water tube, the motor should spurt water out of the flush plug for several feet. That should happen regardless of any possible blockage in the powerhead or exhaust cover. The flush plug is the "first stop" for incoming water.
After having problems in the past, with the water tube grommets swelling up and blocking cooling water, I now make it a practice to always change the grommet when changing the waterpump on HD and TD models. After all, the old grommet is also around 70 years old. A new grommet will remain open, and also seal better within the channel that it sits in. It makes a big difference. The part number is 300582. http://www.marineengine.com/newparts/pa … OMC0300582
The only other thing that comes to mind is that some of the aftermarket pumps are made too thick and can bind up in the housing. I have also seen pumps where the "piston" at the top of the pump binds up in the channel. Hope this helps.
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