old 110 johnson overheating after winter

[wayne nicol]

hi all,
i have a J110 TLCUR( i think it is a 1987 model!!), was running perfectly when i stored my boat end of last summer, i took it out today to get it running. coupl-a cranks, and had her running, but the temp climbed steadily until the buzzer went off. temp gauge showed it was high.
i know this is an old motor, but i really like it, and enjoy tinkering with it- even though i am no mechanic!!
could thermostats be stuck closed!!???!!
VRO is by passed. mix in the tank
new impellor and pump towards the end of summer, about a month befor i put her in the shed
i run in salt water, but i flush extensively after every use
any ideas, and what should i do.
please remember, i am a techno peasant, so will have to be guided through the process
thanks all
wayne

 

[boobie]

Re: old 110 johnson overheating after winter

If you want to work on it yourself the best thing to do is buy an OEM Factory Service Manual.

 

[wayne nicol]

Re: old 110 johnson overheating after winter

good advice and well accepted.
whatdo they cost, and where can i get them. i think i did the online thing last summer, where one can download. but i think the book will be better!!
looks like iu did replace the thermostats last summer too- found the old ones in the box- i keep all the old parts- just for reference.
and i remember taking the covers off, and a bolt breaking- quite a job to get it out- but we did , thankfully.

was just trying to see if there was anything i could do to remedy/identify this problem today, so that with any luck i might be able to take the boat for a short run tomorrow.
going to borrow a laser temp reader, and see if it is isolated to one bank.
\
any other ideas??

 

[64osby]

Re: old 110 johnson overheating after winter

"After Winter" ??? Had 6" of snow last night and it's 16 degrees today.

Do you have a set of muffs or a barrel so you can test in the driveway?

Thermostat, impeller and housing, hoses and connections / grommets, or a blockage are the things that cause motors to overheat.

 

[wayne nicol]

Re: old 110 johnson overheating after winter

got muffs on, water seems to be coming outta everywhere on the leg, the laser thermometer will be here in a few minutes, and will check that again.
new thermostats, impellor( entire waterpump kit)- hoses and connections seem fine- no leaking water up top, what and where do i find the grommets, what to do about the blockage- how does one isolate/identify the blocked area

thanks

 

[wayne nicol]

Re: old 110 johnson overheating after winter

ok, so this is what i got temps wise.
the port bank is running about 40f to 50f cooler than the starboard bank. port about 140f and starboard 180f when i shut it down.the after market temp sensor is mounted on the starboard bank, upper cylinder- so thats why the gauge also showed hot, when the buzzer went off.
is this temp difference normal?
what should i do now?
open the cover and examine the thermostat??

will i need new gaskets, is it normal for a new thermostat to get "sticky"
what are the grommets, and what purpose do they serve?

thanks!

 

[bonzoscott]

Re: old 110 johnson overheating after winter

If you replaced the impeller / pump, you may have mis-aligned the water tube leading to the grommet at the power head, blocking the flow.

 

[wayne nicol]

Re: old 110 johnson overheating after winter

thanks,
it ran out many times , fishing all day, after the replacement.
but i could check that if you think it is a real problem.
there is water coming out of the tell tale.
how would i check that.
should i possibly take the hoses off leading to the head, and check for flow there??

 

[boobie]

Re: old 110 johnson overheating after winter

Yes.....If you got good flow there you know there is is no prob in the P/H and the prob is in the thermo hsg. Beware. That mtr has water deflectors underneath the cyl heads in the block. They can swell up causing water flow blockage and also cause an overheat problem.

 

[wayneo99]

Re: old 110 johnson overheating after winter

take water hoses off the bottom of the heads there should be good flow and temp should drop off if it was hot before you removed them. if one side is hot vs the other its probably the t-stat on that side. I had the same issue a few yrs ago.

 

[wayne nicol]

Re: old 110 johnson overheating after winter

yea, i have read about the deflectors, are they worth replacing anyway- and how difficult are they to do.
i work slow and carefully- did the thermostats and the waterpump etc, and tinkered with other motors too.
geuss i would have to take the heads off to get to them- how will i know if it is them causing the hassles
will removing the water hoses, and seeing a reduced flow on that bank mean it is the deflectors, or a faulty/stuck thermostat.
i will try the waterhoses tomorrow morning- dark now! just seems crazy , as that thermostat is only a few months old!!!
anyway- i will look into it.
as a matter of interrest, how does the water flow?
- from pump, up to the heads( through the above mentioned hoses), then down and out to the exhaust, i geuss the tell tale is on the way to the motor, as it is always cool !
but i geuss that cant be right, as how would removing the hoses cool the motor off????
please help this fool!!!

thanks guys for all the help.
wayne

 

[emdsapmgr]

Re: old 110 johnson overheating after winter

Your heads should idle between 143 and 150 degrees. Maybe a little warmer in the summer (155). Once you get on plane, the pressure relief valves open in the thermostat housing-flooding the powerhead with extra cooling water: and the head temps may go down 20 degrees from idle temps. You will sound a hot horn when the head heats up to 212 degrees. That hot horn will silence when the head cools to 175 degrees (still too hot.) The tell tale is plumbed at the exhaust cover, close to where the fresh coolant enters the powerhead. A strong telltale indicates is that the impeller is pumping. The thermostat housing is at the back of the cooling system-if one of the stats sticks shut, the cooling water can't circulate out of the block and that head will overheat. You've changed the impeller and stats and still have the problem.... Agree with boobie, pull the heads and check the rubber water deflectors. In addition, make sure that salt deposits are not restricting water flow around each cyl. Whatever you find inside the block will probably also be inside the heads. You may need to pull the head covers off both heads and check for obstructions/deposits there also. Pulling the hoses when running is a good test. Only go with a factory manual. You can get an original factory manual from: outboardbooks.com, or call Ken Cook co. in Milwaukee.

 

[dazk14]

Re: old 110 johnson overheating after winter

If you want to work on it yourself the best thing to do is buy an OEM Factory Service Manual.

+++ Usually available on Ebay at sometimes bargain prices.

 

[James R]

Re: old 110 johnson overheating after winter

If you use in salt water funny things happen to thermostats and passages. Best to remove and check.