Mercury 40 4HP Overheating

A

Adam99

Recruit
Joined
Apr 29, 2007
Messages
1
I recently bought a old 1969 mercury 40 4hp outboard. Noticing that there was no water coming out of the pee hole, only hot air, I took apart the water pump and the impeller looked fine. Removing the clean water flushout bolt on the lower rear of the motor and running the motor in a tank, water will circulate out the flushout hole. Does anyone know if this motor has a thermostat? Or any ideas for getting the water to come out of the pee hole? I assume something is plugged up but not sure where to look or how to get it unplugged.
Thanks in advance
 
redjmp

redjmp

Chief Petty Officer
Joined
Mar 16, 2005
Messages
536
Re: Mercury 40 4HP Overheating

Take a peice of wire and stuff it up the telltale hole to clean it and see how far it goes.
If it was run in salt, there may be some salt build up/corrosion. I took a drill bit to mine and made the hole just slightly bigger so it would not plug up so easily.
If you can stuff in in 3 or 4 inches, then something else is plugging it.
When I pulled my headplate, I found about a cup of sand.
 
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