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1984 Black MAx 150hp Overheating

kerry_smith

New member
"I have a 1984 Merc Black Max,

"I have a 1984 Merc Black Max, oil injected, changed over to mix fuel. Serial # 6443669. It is overheating, no water coming out. Service manual ordered. Is there anything I can do to determine if it is the water pump or just the impeller for now.
Any advice????????"
 
The impeller is integral to th

The impeller is integral to the waterpump. Check for blockages on the intakes in the lower unit but if they look clear it's time to check out the impeller. These should be changed about every second year on average - but don't run it if it isn't pumping water - that is unless you're in the market for a new motor...
 
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