1988 15hp

[phatmanmike]

its actually a 14hp. 1988 . motor wont pee.

if i remove the thermostat and leave the thermo cover off, water pumps outa the thermo housing. water also comes outa the exhaust ports too( i run it in a bucket, not on muffs) so i know its "pumping" water.

with the thermostat in, i get a lite dribble outa the pee tube, and i get a normal looking amount from the exhaust ports.

with the thermostat removed and the cover put back on, i get an over abundance of water from the exhaust relief ports. LOTS of water, a very strong spray at idle.

any ideas? does this mean h20 pump is dead or thermo needs replaced. i tried running wire in the pee tube, no change.

could it be that the thermo is old and stopping water flow? it doesnt over heat, i can touch the motor on all sides and it isnt overly hot. this is the first time ive ran it in a few months, and last time i ran it it peed after just a few seconds or soo.


i tried cleaning the thermo, its atleast 3 years old, thats how long ive had the motor.

 

[Jack Spratt]

Re: 1988 15hp

My 1978 Johnson 15 never had much water out the telltale. After replacing the thermostat, and impeller things are still the same.
The good news is that after a tank of gas, which is quite a few hours on this engine, things are still running fine.

 

[ratracer]

Re: 1988 15hp

My '88 9.9 has always peed like a racehorse. Very strong flow with good pressure even at idle.

Have you tried using a pan of boiling water on the stove to see if the thermostat is working properly?

 

[OBJ]

Re: 1988 15hp

Mike....blow back through the tell tale line with compressed air. You just might have a chunk of mud or scale blocking the hole on the inside of the exhaust cover.

 

[ezeke]

Re: 1988 15hp

I had to remove the threaded fitting from the exhaust cover to get rid of the clog in my 1983 15HP. I think it was hardened grease of some kind.