Johnson Ocean Pro 90 overheat

[cfajosh]

My Johnson Ocean Pro 90 was running great today and all of a sudden it throddled down and started smoking. I pulled the throttle back and it cut off. If I try to restart, it shuts down immediately and alarms hot. I did have water flow from the motor when it stopped. Does anyone have any ideas on what I should check?

 

[jeffersondodson561]

Re: Johnson Ocean Pro 90 overheat

Compression! For best results post your model number.

 

[boobie]

Re: Johnson Ocean Pro 90 overheat

If I read your post correctly did you get an overheat alarm?? Did it go into slow mode?? And yes, a model # would help.

 

[cfajosh]

Re: Johnson Ocean Pro 90 overheat

The model is a J90VL, yes it did go into SLOW, I only got the overheat alarm on restart attempts even long after it had cooled down

 

[bob johnson]

Re: Johnson Ocean Pro 90 overheat

one reason Ill never run a boat with out temperature guages, and a water pressure guage.

I dont trust those alarms.... yesterday I was running my ocean runner 115 at 4500 rpm...running like a top and the guages readong 110 on both heads....and the over heat alarm went off. The light came on and the alarm rang for about 10 seconds, then went off...the light stayed on....motor kept running like a top...but I knew i got funky alarms all the time... when i idle down i see the temp rise...but once i put 20 PSI to the motor in water pressure the temps drop like a rock...

this year is the first year the alarm has been going off while running.....usually i get the alarm exactly 2 minutes after i start the motor, and it shuts off exactly 10 seconds later...happnes 100% of the time...but it has corelation to my actual temps....so i supect bad sensors

in any case my point being..SEEING, and KNOWING ....EXACTLY what the temps are in your heads, is what can save your motor..

i had water pump-pressure issues this summer....temps ran up to 180 and almost 200 pretty fast...no alarms went off...but I shut the motor down!! I chose to not let it run that hot...

i think i saved my motor..... when i see the temps rise.. I dont have to know the reason, but at least i can shut the motor off....and not destroy it.once i got mud and algae sucked up in the water pump and got no water cooling...i saw the temps spike and I shut it down and went back and cleaned it out.......dont wait for maybe if the alarm goes off.....and even if it does, you got too hot already!!


now you have to worry if you damaged a piston....or the rings or the bore.... if a piston gets too hot it can warp and start slapping the cylinder walls...i bought a motor like that once.




check out what damage you might have and check out what wasnt working....you got oil? you got water pressure? you got a clogged water passage?? find out


good luck

bob

 

[jeffersondodson561]

Re: Johnson Ocean Pro 90 overheat

If you have verified overheat I would check pressure relief valve (damaged stuck open)? Tstats as well, obviously water pump too.

 

[bob johnson]

Re: Johnson Ocean Pro 90 overheat

If you have verified overheat I would check pressure relief valve (damaged stuck open)? Tstats as well, obviously water pump too.

wrong motor style jefferson......

thats a thermostat set up for a cross flow...all ocean pros are 60 degree LOOPERS...they have a single thermostat in each head right up top which is sooooo easy to access...useing the same socket as the spark plug!!!!


bob

 

[toddschubert]

Re: Johnson Ocean Pro 90 overheat

I didn't think ocean pros had that therm setup but what about water deflectors? They can be oberlooked if that motor has them

 

[bob johnson]

Re: Johnson Ocean Pro 90 overheat

I didn't think ocean pros had that therm setup but what about water deflectors? They can be oberlooked if that motor has them

NO water defelctors either!!!!

and probably the reason that 60 degree design was carrying into the e tech design and the crossflows stopped in 1998...



bob

 

[jeffersondodson561]

Re: Johnson Ocean Pro 90 overheat

wrong motor style jefferson......

thats a thermostat set up for a cross flow...all ocean pros are 60 degree LOOPERS...they have a single thermostat in each head right up top which is sooooo easy to access...useing the same socket as the spark plug!!!!


bob

:facepalm: