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1989 Johnson 110HP Overheating

"The restrictors direct how th

"The restrictors direct how the water flows through the cylinder and head to optimize and give EVEN cooling to all cylinders. Clean out all cooling channels and install new ones.
With regards to what You said about water leaking down the exhaus, there is one more possibility except the water tube and gaskets and that is a leakage in the exhaust cover gasket or corrosion hole in the plate '49'. Perhaps You should take down that as well when You are at it."
 
THanks Morten.

AM I able to

THanks Morten.

AM I able to easily remove Item 49 and inspect?

I can remove Item 51 easily but will cost me another $60 AUD in gasket :0-(

Cam
 
"Providing screws does not bre

"Providing screws does not break, it should be no problem.
Given the salt/alu-oxide buildup You mentioned to have in the heads I would not be surpriced if You find it even worse her!
It will even give You a look at the pistons exhaust side and conditions."
 
I have jsut dicoverd I have ac

I have jsut dicoverd I have accidently splash some water into the internals (inside clinders)as I have seen water droplets immersed in oil isnide. I am nervous now. Have I done irrepearble damage? What do I do now?

Cam
 
"Sorry for being late, net-pro

"Sorry for being late, net-problems.
Use fogging oil or other water-repellant oil on cyl walls, then hopefully no problems.
The boot is only a matter of 'force', but leave it. Even a minor leakage that far from waterpump will have minor result on pump function. The lower next to the pump is critical."
 
THanks Moreton.

When you sa

THanks Moreton.

When you say "lower next to pump is critical" - What ITem number are you referring to?

THe fact that the boot can be wobbled - is this not a good sign in any case? How hard must I pull the boot to make it come off to warrant a bad seal ('24')?

You have been a great help thus far Moreton. Relaly appreciate you sticking with me.

I have all my new gaskets on order and hope to receive them within next week.

Cameron
 
The lower (30) is crit

The lower (30) is critical in the way: If this is leaking exhaust is blown straight on the water-pump housing with both 'air' leak possibility into pump and heat/burn dammage to pump and seals. The upper (24) will be to far away to normally do any dammage .
Did You get the exhaust cover down?
 
I firmly beleive leaking exhau

I firmly beleive leaking exhaust was blowing straight on the water pump becuaase Item 30 was shot/scewed inwards - not allowing flsuh fit onto flanges. Looks like it is 20 yo as well!

Not taken exhaust cover yet - don't knwo if I want to go down this path yet - I took this cover off in Feb and all looked well.

Waiting on new gaskets - I live in such a remote place - postasge is a royal pain.

Cam
 
"OK Boys.

My gaskets have a

"OK Boys.

My gaskets have arrived and I now have a weekend of fun in front of me.. :0

Unfortuantely, the supplier shipped the wrong water pump housing bolts after I specifically popinted out the differnt lengths (and not to send me the longer ones - he did :-( )

So, no water pump use this weekend.

Anyway, once I put heads back on, can i use the hose up water tube to test run the powerhead - if so high or low water pressure?

HInts for re-install of head covers and t-state assy please...

Cam"
 
"During assembly use Sealing C

"During assembly use Sealing Compound or similar on ALL gaskets and screws. If installing new water deflectors, dip them in dish-washer liquid before installing. NO grease or oil.
Be sure the vent hole is open in '14' and '32'. The valves may only be installed one way, or You will not get th spring on. Be sure the springs have the same length (un-loaded). Take out bushings '13' and clean between bushing and housing, put them back using Sealing Compound.
Do NOT start the engine with gearcase down and hose on the tube!!!Wait until You get the needed pump parts.Then run in a barrel with water above pump housing and not on muffs. You may hook up the water to the tube and check for leaks in the tube and upper tube grommet '10'."
 
"THanks Moreton.

Where is t

"THanks Moreton.

Where is the vent hole in '14' and 32'?

How do I ensure they are open? (BTW - Items 14, 32 and 13 are brand new and still in the bag)

What sort of sealing compund do i use for 13 and why?

Cam"
 
"Gearcase screen -just push do

"Gearcase screen -just push down. Do NOT take out screw 3, it locks the pinion bearing!!!!!
Sealing Compound is the BRP brand name for gasket sealer. There are others like Permatex etc.
By using on screws You prevent water getting into the threads and seizing the screws over time, and it works as a very soft screw-lock so they does not vibrate out.
If 14,32 are new, note the small 1mm hole between the thermostats. It is to let air out and water quickly to the thermostats.
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"
 
THanks.

Re: Item 29 (t-

THanks.

Re: Item 29 (t-stat) in first pic - Is this shown how they must go in (with stem facing out)?

Cam
 
Re: Item 70 (Housing COver

Re: Item 70 (Housing COver) in the Gearcase pic - what is the purpose of that rasied conical portion?

I cannot access the water intake screen at all - how do I access it?

Cam
 
"Moreton,

I have just inspe

"Moreton,

I have just inspected my old Item 32.

What a mungrel!

That small 1mm vent hole between the thermostats was/is no such thing but rather 20 years build up of rock solid crud! Also, that 5mm hole directly above it was/is reduced to about 1mm from the 20 year old crud!! What a mess.

The fact that both holes were more or less bogged right up (which would not have allowed air out and water quickly to the thermostats) - direct syptoms please?

Cam"
 
"Good morning!
The water come

"Good morning!
The water comes from engine and down into the rear housing and has to hit the thermo element of the thermotat first, pic is correct.
'70' is a water tube guide and further to seal off against exhaust entering down the drive-shaft.
Water inntake screen has normally to be 'crushed' and pulled upwards. remove pump and bottom pump plate.
It is rather important that the thermostat system is as 'designed'. Blocked air-vent holes, thermostats of different types, springs with different lengths and caracteristics just add trouble. If not in 'ballance' normally on cyl runs hotter/colder than the other and it all gets messed up. When running fresh-water allways run atleast 1/2 hour on low idle so only the thermostats opends and not the valves. This will let the water clean out salt deposits in the the thermostats and normally make enough pressure to keep the vent-hole open. However it might be advisible every 3-5 years to change thermostats and impeller at the same time. That system is part of regularly maintanance and not 'run until brake'."
 
"Moreton,

I have a problem.

"Moreton,

I have a problem. Item 33 seems (first pic) to be too thick because it prevents Item 14 laying flush onto Item 32.

PLease advise.

Cam"
 
Moreton.

WHy is 1/2 hour ne

Moreton.

WHy is 1/2 hour needed to flussh with fresh water at idle (why not say 10 mins)?

Vent hole - if this hole was critical - why only 1mm dia?

Cam
 
I will now cease all work this

I will now cease all work this weekend.

THe suppleir has incorreclty supplied me with parts and I am pretty pissed!

Cam
 
"33 is a sealing gasket and wi

"33 is a sealing gasket and will be compressed during assembly. Keep it!
If vent hole too big -too much water bypasses the thermostats. Some thermostats has vent-jacks or holes in the plate, some not that may 'replace' the vent hole in the spacer housing.
Salt dissolution is a time matter, not a question of amount water flushing through. Salt tablets are used as timers in a lot of 'nautical' applications like 'automatic' life-wests, mines (Navy) etc. They drop the mines, gets at safe distance and the wire-drum is releasd -up goes the mine to set depth.The timer consists of a number of salt-blocks, all depending of the wanted delay. The most probable reason for Your salt-build-up: You have been running too short time in fresh water."
 
Re: Item 33 - Do I still inser

Re: Item 33 - Do I still insert it in - even though gasket ('14') will not sit flush on valve body ('32'). Do i proceed with install?

SPlash
 
"I guess 33 is rubber, used to

"I guess 33 is rubber, used to be cork. Yes - install or You will have a wobling thermostat that does not seal properly. Furthermore it will 'isolate' the SST thermostat (hopefully) from direct metal contact to aluminium and reduce risk if alu-oxide build-up."
 
OK - WIll install - it is cork

OK - WIll install - it is cork btw.

Oh - that spiel about the salt is really interesting - i bet not many other boaters know this. Do you happen to know the rate of decay salt has - just out of curiosity??

Cam
 
"'Salt' is not only ju

"'Salt' is not only just salt, and it all depends rock-salt, sea-salt, chemically engineered salt....... But if You go above 65C it starts to get into crystals and build up. If everything is working as should, that is the max operating temp of theengine. If You was able to monitor engine temp, You notice that the engine temp DROPS at around 2000rpm when the pressure valves starts to open. Up to this rpm the thermostats are able to handle the cooling flow alone. If Your impeller starts loosing its pumping ability, You might need to encrease the rpm to open the valves, not enough cooling, temp goes UP and the salt gets into crystals and starts blocking. The impeller might look ok, but it gets hard by years and should be replaced every 3-5 years to avoid this problem.
The best way to monitor this is by installing a pressure gauge in the cooling system. Put a T-connector in the tell-tale hose."
 
Excellent analysis Morten - It

Excellent analysis Morten - It is all becoming 'crystal' clear for me - as to why I have such severe salt build up. THansk again!

BTW - I went ahead with install - all back together - Will torque up all bolts during week when I have the right torque wrench.

Thanks for giving mw the incetive to go ahead today..

Will keep you informed over next 2 weeks after I receive my correct water pump housing bolts.

THe donk will probably start next Sunday - depending on postage for bolts etc..

Cam
 
"Moreton,

Iten 79 - ORING s

"Moreton,

Iten 79 - ORING seal bettwen steel cup and plastic water pump housing - what is it's purpose?

Big weekend - coming up - got all the gaskets and now I re-install whole lot.

Stay tuned.

Cam"
 
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