1992 Evinrude 150 Oceanpro

[striper chaser]

I recently purchased a 1986 20' Aquasport center console with the 1992 Evinrude 150 Oceanpro on it. I pulled the thermostat caps to see what the t-stats look like after being in salt water and there was no t-stats just a hole where they go. The VRO has been removed and everything bypassed correctly, as far as I can tell from what I know and have learned.
I noticed that the starboard head gets hotter than the port side head. Do the t-stats need be in, what will happen if they are not installed?? I have run it twice so far in the Charleston S.C. bay. At first it was a PITA to start so I checked the plug gaps and they were WAY out, like .040-.045 they are now at .030 and fires right up first crank but runs rough at idle and runs like brand new at WOT. Could this be because of no t-stats? Trying to solve the rough idle situation!!!

 

[dingbat]

I noticed that the starboard head gets hotter than the port side head. Do the t-stats need be in, what will happen if they are not installed??

Runs cold...smokes like a chimney, oil runs out of exhaust ports, fouls plugs and carbons up the combustion chambers. Makes a real mess once water temps get down in the 50's

Running in SW, make sure you get SS thermostats. Mine are 10 years old and still look like new.

and runs like brand new at WOT. Could this be because of no t-stats? Trying to solve the rough idle situation!!!

Rough idle compared to what? Not the smoothest idling motors by any sketch

 

[saltchuckmatt]

I recently purchased a 1986 20' Aquasport center console with the 1992 Evinrude 150 Oceanpro on it. I pulled the thermostat caps to see what the t-stats look like after being in salt water and there was no t-stats just a hole where they go. The VRO has been removed and everything bypassed correctly, as far as I can tell from what I know and have learned.
I noticed that the starboard head gets hotter than the port side head. Do the t-stats need be in, what will happen if they are not installed?? I have run it twice so far in the Charleston S.C. bay. At first it was a PITA to start so I checked the plug gaps and they were WAY out, like .040-.045 they are now at .030 and fires right up first crank but runs rough at idle and runs like brand new at WOT. Could this be because of no t-stats? Trying to solve the rough idle situation!!!

Engine was designed to have t-stats. Perhaps you have some clogged passageways. Do you have any temp readings of each head?

Is your overheat alarm working?

 

[racerone]

Trouble shooting starts with a compression test.------Post your numbers.

 

[striper chaser]

Runs cold...smokes like a chimney, oil runs out of exhaust ports, fouls plugs and carbons up the combustion chambers. Makes a real mess once water temps get down in the 50's

Running in SW, make sure you get SS thermostats. Mine are 10 years old and still look like new.

Rough idle compared to what? Not the smoothest idling motors by any sketch

It does smoke till it warms up..

I'll put in the t-stats regardless and yes I'll get the SS ones for sure, thanks for the heads up on that...

I was not sure if rough idle was adherent to these, it doesn't seem to be a problem just wasn't sure if it was normal or not.

 

[racerone]

A 60 degree V-6 should idle nice and smooth

 

[striper chaser]

Engine was designed to have t-stats. Perhaps you have some clogged passageways. Do you have any temp readings of each head?

Is your overheat alarm working?

overheat alarm is not hooked up. I know it should chirp when the key is turned on which it does not. I have the service manual but the colors don't seem to match up. The buzzer has 2 wires going to one post and nothing on the other post so I need to find that wire. Who ever had it before did a lot of wiring that is atrocious, dead ends everywhere. I've been rewiring everything on it. When I get home I plan on tracing the temp. sensor wires and see where they go. Are they supposed to go to the buzzer or ignition?

I don't have any readings as the temp gauge is not hooked up correctly. The guy had a jumper going to each "S" post on each gauge starting from the fuel gauge.

The wires from the motor are faded and tough to decipher what color is what so I have to trace them one at a time.

 

[striper chaser]

A 60 degree V-6 should idle nice and smooth

I need to rent a comp. tester from the parts store. Been wanting to do this but been busy. I'll see if I can get one this afternoon..

 

[striper chaser]

I really like this motor, from what I read they are pretty rugged, easy to work on and parts are available...

 

[havoc_squad]

I need to rent a comp. tester from the parts store. Been wanting to do this but been busy. I'll see if I can get one this afternoon..

Really should buy a decent quality one if you plan on working engines especially outboard often.

$50 from most places in the US will get you a decent one.

Compression and spark gap tester are two key tools even weekend DIYrs need to have.

 

[saltchuckmatt]

overheat alarm is not hooked up. I know it should chirp when the key is turned on which it does not. I have the service manual but the colors don't seem to match up. The buzzer has 2 wires going to one post and nothing on the other post so I need to find that wire. Who ever had it before did a lot of wiring that is atrocious, dead ends everywhere. I've been rewiring everything on it. When I get home I plan on tracing the temp. sensor wires and see where they go. Are they supposed to go to the buzzer or ignition?

I don't have any readings as the temp gauge is not hooked up correctly. The guy had a jumper going to each "S" post on each gauge starting from the fuel gauge.

The wires from the motor are faded and tough to decipher what color is what so I have to trace them one at a time.

Shouldn't run it until alarm is hooked up. With missing t-stats there is a good possibility there was an issue.

Temp sensor comes out of the back of the head....note wire color.

I was thinking of an IR gun like this.

 

[striper chaser]

Trouble shooting starts with a compression test.------Post your numbers.

Port side from the top 1=92, 2=92, 3=94
Starboard side from the top 1=93, 2=98, 3=98
stayed the same even after I sprayed some lube in each cylinder and retested

 

[racerone]

Compression is even and that is a good sign.

 

[striper chaser]

I'm here in Charleston S.C. for a few months from Idaho doing some work so all my mechanikin tools are there. I really don't want to spend money on stuff I already have at home...
I picked up the bloat knowing it needed some TLC so Break Out Another Thousand it is but I believe well worth it...
After running it for a while, like 1/2 hour on WOT and puttering along I checked the head temp by hand, the port side was warm to hot I could keep my hand on it in different areas, the starboard side was hotter but not to where I could not keep my hand on it so I did not worry to much about it overheating. Knowing this does not have all of the electronic stuff on it the newer ones do I did not know if the carbs had to be at a certain temp to run efficiently. Also I see the rectifier is water cooled, interesting...

 

[flyingscott]

Doesn't that have plastic thermostats?.

 

[striper chaser]

Shouldn't run it until alarm is hooked up. With missing t-stats there is a good possibility there was an issue.

Temp sensor comes out of the back of the head....note wire color.

I was thinking of an IR gun like this.

that was my other option, the temp gun. should one head but warmer than the other?? and what is to hot a temp??

 

[striper chaser]

Doesn't that have plastic thermostats?.

looks like some have the metal t-stat fitting inside a plastic housing and some without the housing