80s Model Mercury 40hp 2 Cylinder 2 stroke cooling problem

[jathomps04]

I have recently aquired an older bass tracker with a 40 hp mercury 2 cylinder 80's model outboard engine on it. I have worked on it before and had it working but then the impeller went out. I replaced it and now with the new one in there is no water coming out the pee hole. I have double checked to make sure that there is nothing wrong with the lower unit assembly and everything looks good, including the impeller. What else can I check to find out why the water isn't exiting the pee hole. BTW, I have also checked to make sure the hole itself isnt clogged and it isnt.

 

[steelespike]

Re: 80s Model Mercury 40hp 2 Cylinder 2 stroke cooling problem

Be sure the water tube and grommets are in place.<br /> If the impeller crumbled pieces may have plugged the water galleries as well.

 

[jathomps04]

Re: 80s Model Mercury 40hp 2 Cylinder 2 stroke cooling problem

Is there any specific way to check and clear anything that might be clogged?

 

[jim dozier]

Re: 80s Model Mercury 40hp 2 Cylinder 2 stroke cooling problem

Remove the thermostat housing and thermostat and remove the lower unit. Back flush the system with a garden hose then forward flush it with the hose on the pickup tube that sets in the impeller. You should get flow both ways, if you don't you got a clog somewhere and it gets a little more dicey trying to figure out where. If you get good flow I would suspect something amiss in the water pump despite your best efforts to replace it.

 

[jathomps04]

Re: 80s Model Mercury 40hp 2 Cylinder 2 stroke cooling problem

Thank you for your help. I got it fixed.