Outboard Thermostat Test and Replace

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I am replacing the thermostat on my 1991 Evinrude 30hp. The motor would not get to operating temperature. When I change the thermostat I could see way. The thermostat would not close all the way or open all the way. That was probably a good thing for me.

[@TheSudburyboy]

I am impressed with the quality of the videos. The viewing angles and focus are always excellent. Thank you!

[@BUBS_HD]

You do some excellent videos! Very thorough and clear! After seeing some of your videos, then reading your comments I have to say you're a very stand-up guy.🖒 I work on alot of outboards on the side myself and have a very good reputation among everyone in my area for the quality and speed of work I do. So seeing your professionalism is very appreciated. Keep up the great work like you always do buddy and God bless 🕇🇺🇸🕆🖒

[@OmFishing]

Thank You and keep watching. Feel free to share you knowledge.

[@jamesphillippe3653]

Thanks for the video. I learn a lot from these.

[@mikekrupa8030]

thank you! I think you saved me a ton of frustration. I am working on a Mercury Mariner 60HP Bigfoot.. no pee... changed the entire W/pump and lots of pee.. but my alarms still goes off. Before i ran it i "thought i checked the thermostat... but i didn't know what to look for. It "looked larger" so i assumed it was "open".... so i ran it on the lake for a few minutes and the OVERheating alarm was constant. NOW i think I figured it out. I never looked to see the top part of the thermostat pop out- ie. "open" i ASSUMED since it got larger it was "open"! OK, now i will check it out the right way! Great video... i also like the one where you walk through how the water flows... GREAT! thanks.

[@OmFishing]

Thanks for commenting and don't forget to check the sending unit. Stay Well.

[@ethanlevoy3999]

Thank you so much for making the video, it explained my problem reallly well

[@OmFishing]

Happy to help Stay Safe.

[@stepheng7210]

Your video helped me a lot thanks

[@OmFishing]

Glad it helped, thanks for watching.

[@extracoolmurphy]

Great video Jim. It looks like it needed it. I will be checking my 1993 Johnson 30 soon. thanks again!

[@OmFishing]

Thank you ; )

[@OmFishing]

Thank you

[@ivarsmatisons]

Paldies par informaciju

[@javierc.salazar512]

Thanks Jim, I'll check the temperature on my 2003 15 hp yamaha. It run great, but I'll still check it to be on the safe side. Thanks Bud.

[@OmFishing]

Good idea don't wait till it will not run to do maintenance. Keep watching and stay safe!

[@jackfarrell4727]

Thank you for the video brother

[@OmFishing]

My pleasure happy to help. Stay Safe.

[@chrismccartney8668]

Good clear helpful video

[@OmFishing]

Happy to Help. Stay Safe.

[@cenkaetaya]

I have a 1985 with some fairly rusty bolts and I am worried about pulling cover. What would you think of drilling a small hole next to it so that a flushing liquid could enter easily into the jacket. Clean flush it well and then just plug up the hole.

[@OmFishing]

I have never tryed that. I use a heat gun and heat the block and I have had very good luck like that. If you do try your idea please let me know how that works for you.

[@gotyabitchrepo5521]

I have a 1994 evinrude 25 hp it runs fine up to 1500 rpm the it starts acting like it not getting fuel i have replaced the fuel pump all fuel lines rebuilt the carb replaced fuel line and bulb also new tank any ideas?

[@fatfreddyscat5173]

Great explanatory vid! Thanks for making it available! d:^)

[@OmFishing]

My pleasure! and thanks for watching.

[@harrycarlock800]

What manual are you using for torque specifications. I have an evinrude 6hp. Runs at slow speed but when you go full it wants to shut off. Then when you stop. I have to wait about an hour before it will start again. Do you have any ideas what could be causing that. Its a e6rcud. 1987

[@OmFishing]

I am using the Clymer Evinrude/Johnson Outboard Shop Manual. If that was my motor I would get the shop manual and start with fuel make sure the carburetor was clean all three parts low speed, intermediate and high speed. Make sure the fuel pump is working properly. Some times I set my fuel tank higher then the motor so the fuel pump does not have to draw much. Are you sure the fuel is ethanol free. I know that the electrical system is the weakest link. Does it get spark to the spark plugs when the engine is hot and don't want to start, is it getting fuel. My thought is if it will not rev up it is a fuel issues. If the Carburetor float is not set correct that can cause this too. Just take one part at a time and make sure it is set right. Thanks for watching and Stay Safe.

[@Geovar128]

My evinrude 9.9 hp 1989 keep leaking out of the carburetor area. Even when the motor is off. The motor hadn’t ran in 20 yrs. What do you recommend ? Thanks in advance for your guidance. I love the videos , you are a great teacher! God bless!

[@OmFishing]

Sounds to me the carburetor float is stuck I would clean the carburetor and the needle and seat on the float and try it again. Thanks for watching and commenting.

[@davidfranzoni7269]

Hi like the videos! Can you tell me if a broken thermostat would cause an engine to not start? I have a Yamaha Malta that has spark and fuel so I’m exploring all possibilities

[@OmFishing]

If the thermostat was broken or missing the engine would not reach operating temperature. Which would cause the engine to carbon up from not burning clean. I don't think it would get to the point that the engine would not start but it could cause it to run ruff.

[@davidfranzoni7269]

Om Fishing thanks it’s probably not that so, I’m going to drill the main jet with a tiny drill bit as Iv heard that’s the way to go

[@cramos6638]

We have the same outboard so I watch all your videos. You have helped me so much thank you. Maybe that will help my spark plug fouling. I'm going to ad a hotter plug. Champion ql82c. Please let me know what you think. Getting STRANDED in the ocean sucks

[@OmFishing]

I agree not a good feeling. School of hard knocks. I have not tried running hotter plugs let me know how that works for you. Is it the bottom cylinder fouling. I just change mine often and have extra with me just in case.

[@cramos6638]

Om Fishing so I changed the charge coil, both coils, rebuilt the carburetor, changed the thermostat. Now my outboard han no power & doesn't even plane. I'm going to light a match to this outboard 😡😡

[@OmFishing]

Not so fast I know it can be aggravating, but it is just something little stopping it from running. Make sure you have your float set right. I had one every time it started to go up on plane the engine would go back to idle. Turns out the the float was not set right and when the bow went up it shut off the gas and when the bow went back down the engine would rev back up.

[@cramos6638]

Om Fishing wow. I never thought of that. Thanks

[@lmcjmgo1]

HI from Montreal Canada. What problem the motor could have if I do not install a thermostat? I already had several issues because the thermostat gets block. Here in Canada, we use the boat for just 3 months and after it is inverted.

[@OmFishing]

Proper engine temperature is important because, if the outboard runs to cool. 1.Foul spark plugs 2. Poor idle 3.Loss of wide open throttle speed 4.excessive fuel comsumption 5.excessive carbon deposits in the combustion chamber.

[@travis.stevens]

What was the giveaway that it needed replacing? Was it running a certain way?

[@OmFishing]

When I was checking the timing the motor never felt no more then warm. Maybe warm like 70 to 80 degrees. The motor should have been around 140 degrees on the top of the head by the flywheel. If the temperature is under 125 degrees the engine is over cooling. If the temperature is over 163 degrees the engine is under cooling.

[@travis.stevens]

Om Fishing Great tip! I’ll check my service manual for operating temps before I dig deeper.

[@gregmoyers7757]

I just got an 1985 Evinrude 30 running that has been sitting for about 15 years. I replaced the water pump and had to clean up the throttle linkage because it was all gummed up from old grease. Tiller steer. It started alright but it blows water out of the pee hole as it should but also out the exhaust holes in the mid section. Did I do something wrong in water pump rebuild?

[@OmFishing]

I think you did it right. Some motor do blow exhaust from the mid section.

[@darryllee9190]

Nice videos, hay I have a 60 hrs johnson and my bottom plug and cylinder is foiling out and , took plugs out and and bottom cylinder seems to be getting to much gas. I'm getting plenty of spark. I cleaned carburetors put in new floats. It speeds up when I have the throttle at idle at low, when running it seems that it flooding, when I'm revving the engine at high speed idle or throw it in foward gear at and add more power to throttle it seems to bogg out. I cleaned the carbs as well .

[@OmFishing]

@@darryllee9190 It sounds to me like you still have a carburetor issue. Did you put new gasket between the carb and the engine. Do you know if the linkage is set correctly that makes a big difference on the timing.

[@darryllee9190]

@@OmFishing no not sure of the linkage setting and also it seem that the starter struggles to turn on it but it dose, I had the starter rebuilt and I fixed the cable to get a good current to starter but still in some instances struggle to turn, I was thinking timing as well ,could you do a linkage set up video for johnson 1985 I think engine. And you seem like a really nice person. I like your videos.

[@darryllee9190]

I think could be timing to. Hay how much play does the flywheel have. How can you tell is motor is bad

[@sc91260]

I've replace the water pump on a johnson 6hp. Did a pump test with a drill spinning the shafts before I put the lower leg back in and it pumps water.now that I have it back on water is not coming out. Watched your video and had the idea that it might be the thermostat. Took the cover off and only the top part of the thermostat is in there. No spring or anything. I've blowed all the water holes out even took the lower leg back off and blew it out from that end and put it back together but it still doesn't have water coming out.. does it have to have taken thermostat in it time make the water circulate or am I missing something. Thanks

[@OmFishing]

sc91260 Make sure the water pump tube from the pump is in the right place and good seals

[@gregreinhardt1293]

Does steam come out of the motor when it’s hot? If so, take a look at the passages inside the engine. If it’s run in salt water it might have the passages blocked by corrosion in and around the cylinder and head. Also, the passage from the powerhead to the lower leg might be blocked. If all else fails you might be looking at removing the powerhead to get at the problem. Simple things first - always.

[@jordandouble1]

I have the same issue. Did you get this fixed?

[@larryjohnson6260]

The torque on the thermostat cover was that in inch pounds or foot pounds

[@OmFishing]

That torque is in inch pounds. Thanks for watching and commenting.

[@MrSpiller1]

My tempature alarm keeps going off at idle....changed thermostat and put earmuffs on it still was overheating....do you think thermostat is stuck closed...if so how can I open it?

[@OmFishing]

That is possible that the thermostat needs change. Does it over heat when the motor is in the water. Some motors just don't do well on the earmuffs. Try it in a tank or back it in the water first. If it still over heats I would change it then. Stay safe.

[@BUBS_HD]

It could be a bad water pump. Personally I think muffs are a bad way to test a motor because it forces water through the motor regardless. Tank testing is the way to go. You can use anything, a garbage can or a plastic tote, just as long as you can keep enough water in it. Good luck🖒

[@philtrumble]

@@BUBS_HD I'm late to the conversation here I've read on forms that these motors do not like muffs one guy went through three impellers

[@BUBS_HD]

@@philtrumble that could easily be true. You want the motor to run as naturally as possible. Water isn't being forced through the motor when it's on a boat.

[@philtrumble]

@@BUBS_HD I've seen a bunch of guys running in garbage cans with good success

[@mindaugassvilpa4476]

Hi have engine 30 hp 2 stroke 1980/90 Johnson where you conect wire from temp sensor please can you tell me thanks very much?

[@OmFishing]

The temperature sensor has a brown wire on it, that brown wire will connect to brown wire on the ignition module.

[@mindaugassvilpa4476]

Power pack or startor??

[@OmFishing]

@@mindaugassvilpa4476 It is not the startor it is the ignition module I think that is what you are calling the power pack you will see the brown wire coming out of it.

[@mindaugassvilpa4476]

Yes I now but on my power pack only 8 wires 2 go coils 1 go negative to engine and 4 go connect to stator and 1 kill switch . Reason whay I am ask Tu you I see evinrude diagram wiring 9 wires my get only 8 on bout power packs

[@mindaugassvilpa4476]

This 4 wires go to down to magnet from Dow to magnet go to charging point this reason ask Tu you ?

[@tullysika]

What would happen if you left it out altogether?

[@heligeorge]

Malcolm Robertson The engine would run cold. The cylinder block would stay cold but the pistons would get hot and expand which would cause issues with regard to piston cylinder clearances. The engine would not run well because engines must come up to working temperature.

[@OmFishing]

Watch my video on outdboard recirculation systems. kzbin.info/www/bejne/qXWxhYmfbcSIlck

[@tullysika]

@@heligeorge ok thanks for the advice

[@terryknutson3202]

Hello.. can you tell me where the thermastat is on 1970 Chrysler outboard is???????????????????????/

[@OmFishing]

With out knowing the make and model but, most thermostats are on the head above the top spark plug.

[@terryknutson3202]

@@OmFishing 1970, 70 horse power, Chrysler....is this enough? The boat is 15 miles away or i wood go look for the model number. Thank you for the reply? We have changed the impeller and such but it still gets hot and does not spit much water???

[@fleetwin1]

Yeah, that is a lousy design for sure. Having to pull off that whole water cover just means techs are less likely to go through the trouble to check/replace the thermostat. Cleaning those threads is a great idea, especially in salt water. Add gasket sealer to the threads of the bolts also to ensure the bolts will never get corroded in place. It is important to clean the head surface under the thermostat gasket/seal to ensure the thermostat seals on the head and water can't seep by at lower speeds. These 32CI engines are cold blooded for sure, and won't run worth a darn with an open/missing thermostat. Many people just remove the thermostat which is a BIG mistake, the thermostat must be in place to ensure water flow is properly controlled and to avoid possible "hot spots". When I see an engine with the thermostat removed, I know there are other cooling problems that have been overlooked. Removing the thermostat to solve cooling issues is just a "band aid" which will backfire down the road.....Thanks for showing the viewers this important servicing issue, especially for salt water use.

[@searider9922]

Testig thermostat operation must be done while the thermo is suspended on water, not while lays touching the bottom of the metal pot.

[@OmFishing]

Thanks for the tip and on the old one I guess it did not matter because it did nothing.

[@masterful7574]

Ing not een

[@OmFishing]

Bedankt voor het kijken en reageren.

[@masterful7574]

@@OmFishing على الرحب و السعة

[@richardd3663]

What type of tap and dye set? I've got Metric, UNF, BSF, Whitworth, Uncle Tom Cobbly and all but none of them are the right thread! I wish you Yanks would realise that there's a whole other world outside the good ol' US of A when making these KZbin videos, and for god's sake, learn to say aluminium! Alooooominum sounds so silly!

[@OmFishing]

The tap and dye set is a american standard. the tap was using was a 1/4 - 20. one quarter of a inch diameter and 20 threads per inch. I will work on the aluminium!