Overheating - head on one side 1993 Evinrude Ocean Pro 175

[heebeha]

My port side head is running cool but my starboard heat is hot.

Work done:
New thermostats
New water pump
New fuel lines
Took off head and cleaned out clogged ports, there were two (top round holes) that were clogged completely and the other ports (around outside edges) were half filled with gasket sealant.

There are no head gadgets just sealant.

Slapped the head back on and same issue, hot on starboard side, cool on port side.

I ran it with the thermostat cap off to check if water was getting to the thermostat, it is.

I am wondering if:
1. Thermostats are not opening early enough.
2. Clogged before head or somewhere else.

Anybody have similar problems and a possible reason for this?

Thanks in advance.
JD

 

[dish]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

No head gasket???? Clean the heads,replace deflectors and definetly get some new head gaskets

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Where are the deflectors? You think that's my problem?

 

[bmstang]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

On my 235 i have 3. 2 go between the middle cylinders and one at the bottom cylinder. They're little c shaped cut outs between the cylinders they're pretty obvious when you look for them all three line up in a row the water has a directional flow and they are needed to provide the correct flow. they're small round rubber tubes with a hole in the middle of them. On mine when i did the head gasket there were only 2 and they were melted like a pancake from over heating you will have to pull the head again and this time go get a head gasket they are about $20 good luck.

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Thanks. Ill look for them. I think I only pulled the water cover, not the whole head. Anybody have any photos of what I should be looking for?

JD

 

[bmstang]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Go to my post on page 2 one head over heating and you will see some pictures that ezeke posted of the deflectors.

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

I tore off my head: I dont see any water deflectors do you?
I see clogged ports, which I cleaned out good, and no head gasket I am replacing today but I dont see the water deflectors.

See my images clearer here: http://zetal.com/boats/trophy.html

 

[bmstang]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

I am not sure that is a different set than mine did you see the pics in my post. The way my set up is they are pretty obvious.

 

[ezeke]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Deflectors are on the crossflow engine - that's a looper. Needs a de-carbon treatment.

You need to replace the thermostat seats. There's an updated replacement part available #336416.

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Whats a de-carbon treatment? I ran salt-away throught he engine a few times with no effect.

Does this engine have head gaskets? The Evinrude parts diagram does not show one for the engine but I am pretty sure it requires one for each head. It does not have head gaskets on it now...

Thanks for the info, ill look for these thermostat seats you speak of. What are the benefits of the new seats?

Thanks for all the help guys, I appreciate it. I think im close to gettting her to purr.

 

[ezeke]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Whats a de-carbon treatment? I ran salt-away throught he engine a few times with no effect.

Does this engine have head gaskets? The Evinrude parts diagram does not show one for the engine but I am pretty sure it requires one for each head. It does not have head gaskets on it now...

Thanks for the info, ill look for these thermostat seats you speak of. What are the benefits of the new seats?

Thanks for all the help guys, I appreciate it. I think im close to gettting her to purr.

There's a lengthy discussion in the Engine FAQ Forum, but basically with that engine you use aerosols with an injector on the schrader valve for the de-carb The instructions are on the can of BRP Engine Tuner - see your BRP/Evinrude dealer. De-carbon treatment is one of the recommended preventative maintenance steps found here: http://www.evinrude.com/Content/Pdf/en-US/PressRelease/maintenance_schedule.pdf

The engine uses o-rings instead of head gaskets #0335523.

The new seats help keep the thermostats from sticking and causing overheating of the engine. I can see them in your pictures.

That gray stuff around your cooling ports is probably mostly oil. It will probably wash away when you run the engine hard on open water, but you can break up most of it with some dishwashing powder like Cascade in your test tank.

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

I found this article on de-carbing. Sound right?

I use either Sea Foam or Engine Tuner by Bombardier to de-carb my engines. No, I don't just pour it in to the tank. I remove the carburetor or injector air intake cover, start the engine and spray into each carb or throttle body until the can is empty. Run the engine only at idle or fast idle, but not over 900 RPM while spraying into the cavities. Toward the end I'm trying to flood the engine out (V6 engine). As soon as the engine either floods out or dies, I shut it down.
I remove the plugs and spray a can into the cylinders and turn the engine over by hand to be sure the solution has saturated in, behind, and under the rings. Then I put the plugs back in (but don't tighten), tilt the engine horizontal so the solution sits on top of the pistons. I put the cowling back on and let it sit overnight.

The next day I remove the cowling and spark plugs. I use an air compressor to blow the solution out of each cylinder and turn the engine over again about 10 times by hand, not with the starter. Then I put all the plugs back in (and index the plugs--only mandatory on Bombardier's Evinrude FICHT engines and for racing engines or high-performance injected engines.).

Next I either launch the boat (recommended), or put it on the hose, and start it. Keep your hand on the key because the engine will want to over-rev and burn off the excess solution. If it over-rev's, shut her down and re-start her again. You may have to shut her down sometimes up to three times before you burn off all the solution. If the boat is in the water, just start her and put her in gear and the prop will give enough resistance so the engine won't over-rev as it would if she were in neutral.

 

[bob johnson]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

of all those openings in the head only TWO are for water transfer..the big one at the top with the thermostat seat and the triangular shaped one at the bottom...none of the others are designed to allow water passage...as a matter of fact they are supposed to be sealed....did you notice ont he ehad there are no mating holes for those oval passages????

that is why there is sealant in all those holes...to seal water from leaking out of the block past the aluminum to aluminum surface between the head and the block!!!

no head gasket is used with that block design....just O rings around the bores...

use sealant on all the holes except the top thermostat seal....

the book says NOT to use sealant there!!!!


you can see there is corrosion there, because they try to leak!!! ha ha ha

when you get new t-stat seals m ake sure you put them in the right way...they install from the underside of the head, but the seat is on the other side..INSIDE the head....thats where the t-stat makes contact..


I did all that you are doing...even bought used heads cleaned them up great and installed new o-rings, t-stat seals, new T-stats, and new water pump...and it didnt change anything either..

i cleaned my carbs and cleaned the high speed jets really good and my problem was solved ..

those t-stats dont allow much water flow...but thats the way they are designed.

I left my t-stats out for several test runs and my motor never went over 120, but while they were in one head went to 180-200 often...while the other never went over 160...

i am pretty sure in the end, i was running lean on my port side.... the carb work did the job...

good luck

bob

 

[ezeke]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Quote: I found this article on de-carbing. Sound right?

Yes except it's not the recommended way of doing it for newer engines. You don't want that stuff in the carburetors, but in the engine where the carbon is.

The primer solenoid has a schrader valve. You get a can of aerosol Engine Tuner or SeaFoam's DeepCreep, and a $2.00 injector hose and spray the stuff into the engine through the injector with the engine running. Then you let it sit for 15 minutes, start the engine up and burn off the carbon that has been loosened up. On a really dirty engine you may have to do it three times.

http://evinrude.cust.shopatron.com/product/0/763644/_/Injector_Valve_and_Hose_Assembly

http://evinrude.cust.shopatron.com/product/0/777185/_/Engine_Tuner

 

[ezeke]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

One other thing on the shock de-carbon treatment: most of the factory manuals specifically warn you not to leave the treatment in the engine longer than recommended, usually one hour maximum. That's usually found in the first section of your factory service manual under Tune-Up Procedure.

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Is this what you did Bob to fix your issues?

Quote: I found this article on de-carbing. Sound right?

Yes except it's not the recommended way of doing it for newer engines. You don't want that stuff in the carburetors, but in the engine where the carbon is.

The primer solenoid has a schrader valve. You get a can of aerosol Engine Tuner or SeaFoam's DeepCreep, and a $2.00 injector hose and spray the stuff into the engine through the injector with the engine running. Then you let it sit for 15 minutes, start the engine up and burn off the carbon that has been loosened up. On a really dirty engine you may have to do it three times.

http://evinrude.cust.shopatron.com/product/0/763644/_/Injector_Valve_and_Hose_Assembly

http://evinrude.cust.shopatron.com/product/0/777185/_/Engine_Tuner

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

1. On that primer solenoid; where is the schrader valve? Under the black cap in front of the red switch?

2. What is the primer solenoid for? Am I supposed to adjust it at anytime? Mine is always down?

3. Just to clarify: I should only put this Engine Tuner solution in the primer solenoid not in the carbs or inside the plug chambers?

I appreciate all the awsome wisdom

 

[bob johnson]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Is this what you did Bob to fix your issues?

I am not sure that EZEKEs advice for treating the heavy carbon in your motor is a solution to your overheating problems...

it might be...

i didnt have that much carbon in my motor, and I has since gone through almost a whole bottle of the carbon treatment ADDITIVE... so I wont be doing a decarb...

I chimed in because i have a similar motor and I had similar issues( OVERHEAT ONE SIDE)

and since i did all the things you did with the same result...I suspect you might have a a lean condition onthat side of the block...LIKE I did

follow me??

I have small peices of specific knowledge,

guys like EZEKE have broad overall, longer term experience..and knowledge

but I SUSPECT he jumped in because of the OBVIOUS carbon buld up, which needs to be addressed....just not sure if it applies to your over heat problem..

EZEKE??????

bob

 

[heebeha]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

Bob, how did u fix the lean condition? Mine is on the starboard side.

 

[ezeke]

Re: Overheating - head on one side 1993 Evinrude Ocean Pro 175

There are specific problems with these engines that relate to overheating.

The thermostat seats were the subject of Service bulletin # 2225 which specifically staes that the earlier seats caused overheating in these engines and were recommended for change.

Excessive carbon build-up is specifically unbalances the piston, causes rings to set higher and catch the ports, and contributes to run-aways by creating hot spots. Carbon is an excellent insulating material and causes unpredictable thermal conditions.

Engines running lean create inordinate heat because of an overabundance of oxyen in the fuel mix and it can melt a piston.

There is no question that the carburetors should be serviced and synchronized. However, that all three carburetors on one bank are running rich and the cause of the carbon build-up on all three pistons is extremely unlikely.