Outboard Is Overheating | Why is My Outboard Overheating | Diagnosing an Outboard that Overheats

[@cornholiousgaming]

i literally just had the same issues with over heating only i found the issue, after back flushing and disassembling the entire disassemble-able parts of the water flows i found my issue was fragmented impeller peices located in the lower unit directly from the impeller pump to the feed tube the pump goes to up about 9inches into the pipe was an entire 6 peices of rubber blades now my engine ran with water during months of running before i just got sick of never going over 2400rpm, back flushing alone couldnt get the fragments out, i ended up taking a long wire and bent a tiny hook in the end and pulled each peice out one at a time. my engine seemed to run water only causing overheating when the water pressure sensor was plugged in, yes in. but this just goes to show that somtimes you really need to look hard for those peices as black in a black pipe can be mistakenly overlooked. hope this helped :)

[@blacksheep6888]

Use vinegar in a bucket that will flush out the corrosion in the galleries but keep an eye on the tell tail because the debris may clog the tell tail, but done on occasions will keep your motor clean.

[@turner111971]

Poppet valve is another problem to address. Appreciate your videos, great information.

[@rollingrecords9019]

💯

[@danieln3999]

Have a 60hp 2 stroke yamaha. Had a problem with the rubber grommets and seals not sealing on the water tube between the pump and tube. Odd place to have a problem but a zip tie tightened around the seal has held it snug against the top of the pump housing and stopped my overheat problems.

[@Jt-cc9qz]

Thank you, sir, for the video, there's supposed to be a strainer that is located above the water pump further up in the housing , I was hoping you would talk about this. Cause I'm trying to figure out how to access it. I have a 2000 Mercury 225 EFI.

[@jackcox3265]

Great video, thank you!! Question: I have 1999 225 Mercury Optimax. I saw a video recently showed how a dirty strainer that filters water going to the air pump needed to be cleaned on a regular basis. I've owned this motor since it was new and have never head of the strainer, so I looked it up in the service manual. The service manual shows two strainers, one on the exhaust plate and the other on the top of the powerhead. I can't see the one on the top of the powerhead without removing a bunch of stuff and the one on the exhaust plate appears to be plugged with no water connection. Since these cool the air pump and the air pump has no heat alarm, I am concerned that I may be neglecting a preventive measure that should be taken care of. Any advice would be appreciated.

[@mikehall3255]

Great video, my question is, my impeller blades were all sheared off, and there was not much inside when I took it apart, does that mean it is further inside the engine ? The motor is a 25hp 4 stroke yahama 2003.

[@gavirtualhustle6572]

Hi i changed thermostat on my outboard,changed new impeller..pee like a dream..changed carb as i suspected the carb, the powerhead gasket has been changed ,checked cylinder adjustments and gaps and still overheating..changed engine oil...3 5hp mercury 4 stroke..almost new hence i dont suspect anymote gasket blown..any suggestion what i have to look at...not changing the gear oil and not opening it...any suggestion what to look at for more to sort out this overheating ..thanks in advance..

[@DavidSiewiorek]

Great video, I thought you may also adress deflectors that swell on some manufacturers V6's and don't let water run down to lower cylinders and usually cause a overheat horn under throttle. Not a every day issue, but happens. Anyways great video!

[@terryknutson3202]

Hello. Thanks for the video. We have an 1970, 70 h.p. Chrysler engine. We have changed the impeller and it is still getting hot and it does not spit out much water. Could you tell me where my thermostat is? Thank you.

[@edgaravila314]

Straight forward and honest.

[@wg1408]

My impeller was destroyed. Most of the pieces felt out of the bottom. But I have a feeling some have been clogged above. How could I get them out? Use shop vac with straw attached?

[@fabian4213]

Compressed air thru all of the intake vents at the bottom, remove the thermostat and blow. Do the same thing for the pee hole. You need to get all the pieces out or it will block the system.

[@2muchgovt]

I’ve replaced the water pump, the thermostat, and the poppet. Water is flowing out the tail tell and it has never not flowed out. But this year, the motor goes into limp mode when I run at over 4500 rpm for more than a few minutes. It runs fine for long periods of time if I keep it below 4500…over an hour with no problem. Could it be a false alarm from the temperature sending unit?

[@stonedjedi87012]

I am glad I had a look at my thermostat it’s all dirty and open it’s ment to be closed when cold

[@jaredzeno]

What would cause steam to come out of upper exhaust port at idle. I’ve changed the water pump and thermostst

[@tlchild49]

I have a Honda BF40 2021. It has about 10 hours of running time. Today I started the motor and it overheated, no tell tail cooling system indicator.. I hooked up a garden hose to do a engine flush. Lots of flow exiting through the cooling system indicator. Thermostat? Any thoughts on where to start ?

[@dalehof1778]

I Have a 1997 Merc 50hp 4 stroke. Bought the boat in 2000. I've had this problem for quite some time Only when motor is idling for about 30-40 seconds I get and ALARM buzzer. It does have a SOLID stream of water coming out the discharge outlet so the impeller is sending water through the engine. So thinking the cooling ok. I thought maybe its a low oil buzzer. Checked that and oil is full. All I have to do is turn the key off and restart and its all ready to go. If I continue to idol the buzzer goes off again after a while. no buzzer at any time other than idling . I change the oil regularly and someone told me there may be a RESET oil change timer that may need to be reset. But have no idea how to reset it ?? Is that a possibility ? Thanks for any help on this manner. Dale

[@zellerized]

Figure it out? I have a 40hp merc doing the exact same thing right now.. will run strong across the lake with water existing telltale and when you slow to idle it'll alarm solid..

[@dalehof1778]

@@zellerized Yes, Changed the impeller and the alarm stopped going off. The old impeller did not look bad but was a little more flexible than the new one. Don't understand why because it looked like it was pumping water at a good flow but evidently it wasn't pumping enough water, but it did fix my problem. Hope this helps !

[@tmautos-surrey-sussex]

Great explanation Thankyou for doing this video

[@antonistourlitis2533]

I have a 20 HP 4-stroke Yamaha outboard. every month, I run the motor using a deep bucket. Last month, the bucket had a hole in it and it ran dry. I have replaced the water pump and thermostat, but the water does not run through. I have checked all hoses and everything is clear. Any idea if there's any hope for this motor or is it shot?

[@pondgo]

Replace the impeller.

[@frankdavis3486]

new impeller on my 25 evenrude. 92, 2 cycle. removed the broken thermostat. Water isnt flowing through the pee hole. Engine 0verheating. Do I remove the side plate to check for stoppage? This plate is situated where the pee hole is before going through the hose that feeds to the mounted pee thingy on the bottom side.

[@dhiradjbhaggoe7066]

Hello can i ask something i have a 25ph yamaha autolube a 3 cilinder outboard. When am running the outboard after 2 munites s getting slow down by self and a red light s get on. What can be the reason of that light?

[@homespringrealtypropertyma3333]

You didn't mention the water pressure relief valve. But can this stop an outboard from peeing?

[@alanberner]

Yamaha OX 66 - 2 stroke - 250 HP . Engine is new too me , no stream of water coming thru weep whole , , Impeller needs replacing , Today for kicks I ran two hoses , one on lower unit and other hose too flushing system , My thinking since I need new impeller maybe running flushing system might keep engine blocks cool , ( no plans on using boat ) Using gun , one side of block was cooler then other , Starboard side 111 - port 130 . . - No water coming out , ( top ) why difference in temps on blocks

[@brianlorenzo3471]

Would u knw why my sender temp wire on my Mercury Black Max 200 horsepower keeps melting

[@h2000l]

Questions about engine flush: Should full city pressure be used? Is it recommended to use hot water?

[@zellerized]

10-20lb pressure likely

[@jeanramey633]

1998 yamaha 250 2 stroke,saltwater series: new impeller, cylender heads removed and interior brush cleaned. when water is applied and engine running water doesn't make up to the thermostats and engine overheats. water comes out the tail tell. pop valve is good. i replaced the lower unit last year. plese help.

[@darrenjodiemelton670]

I have a Yamaha 90 hp outboard 2 stroke,Ive changed water pump,Thermostat,flushed all of that is good and new, and tail,tail flow is very good,but when out on water running by going by my RPM Gage I can run at 4.rpm but if I push controller up to 5rpm it will run but the alarm sounds off and I pull it back to 4 rpm and it will take a few but will go off? So if I run at 4 rpm I runs good what makes this happen? And with my Thermostat cover there is a plastic peace there and I see in all videos on here that The hole is open with No peace or spring in that area could that be the problem? I don't know what it is? or for? Appreciate your videos, great information.

[@RyanJones-uj3nr]

Did you ever find the problem? I’ve got the same motor. Same fixes. Cleaning the heads now.

[@nebraskaman8247]

Great videos! I’ll have to start buying parts from you guys.

[@daveharrison9319]

I've got a 1990 50hp johnson with the round cover type with one big 17mm bolt head .how much is a thermostat?

[@Dunkolunk]

I get plenty of water flow. The water that comes out feels hot. Not that it burns me. Just to hot to keep your hand under for more than 30 sec. Is this normal? I don't have a temp gage. Mercury XR6 159HP W459hrs on it. Alway driven easy. Flushed after use.

[@BradBraynen-bd6eh]

My engine temp.alarm stays on when in neutral only.all water pasages are clear and clean. It is still pumping .what you think is my problem?

[@E-ZMarine]

1998 175 efi solid beep,.,,replaced Impeller,.,thermostats and temp sensors,.,Still beeps,,trying to get a find for a diagnosis for warning module.,??

[@BillRodgers2]

I just bought a new pontoon with a 90 hp outboard why is their no gauges ie temp/ oil pressure? Can I add them?

[@patrickcryan1789]

2015 250hp suzuki , overheats at idle with garden hose used at alternate attachment. Plenty of flow, yet I get error an code (3-6) for exhaust over heating

[@15569903]

Good video! Thanks for the information

[@michealmentoor-yw4cy]

Hi there I have a Yamaha fl200 bet v6 the knock sensor behind the two heads I can't get to it how do I remove it without having to remove the heads because the knock sensor is irregular and I have been tested it with a new knock sensor

[@user-bl8zw9bo6w]

I've got water pumping out the outlet or tell tale.but the water quickly heats up.thoagh it flows constantly why is the temp going up in water?

[@hanhhuynh7885]

Water coming out the pee hot , what could I do to fix it , the control panel say water hot. Thanks

[@DanielLeongyee-gg7ux]

My yamaha 90hp 2 stroke cannot go past 4300 rpm. If you try it on full throttle past 4300rpm? It will only ran for 10 minutes and the alarm will come on and its on a limp mode....please need help

[@hansvankeulen2028]

Are you shipping parts to Canada ,if no why

[@landog59]

I have a 2004 Yamaha 150 4 stroke that will not idle properly when it starts, it will go at 1200 and will not go down to the proper rpm It will only stabilize at 800 only after it's on gear, causing to insert gear at 1200 with a big crouch to insert gear (not good for the lower unit) thanks

[@bakervinci163]

How do you replace the tell tale

[@williamyangitemai7846]

My waterpump impeller was damage and i clean it good but i wont pee.maybe some went somewhere.how could i trace the çlog.

[@jamdozer5127]

My 1999 90 hp Yamaha runs all day at 3800-3900 RPM BUT when I push it 4000 + RPM the alarm goes off and it enters 'Limp" mode within a few minutes. After idling for 3-4 minutes the alarms turns off and I can return to running 3800 - 3900 RPM. So far new water pump rebuild, replaced thermostat, twice, replace pop-off valve. I have run the engine without the thermostat and no change to alarm going off and turning off after 3-4 minutes at idle. Oil consumption has remained constant in the 12 years I have owned this boat. No drop-off in performance, oh I am pushing a 21' Carolina Skiff. I have always flushed my engine after each an every use. The previous owner was very meticulous when it came to engine and boat maintenance.

[@FirstLast-tw1qf]

See this is a little late but remove your thermostat see if it’s getting water if not your water tube might be damaged not allowing the water from the pump into the block

[@stratosmalakos3535]

I have a yamaha f15 2012 and it is overheating only at idle. It pees fine with new impeller new thermostat and anodes. What might be wrong???

[@claudequeen6614]

Can you put a telltale on a 125 horsepower Force outboard engine it don't have one everything comes out that exhaust but can you put one on it there's a place for it but I was just wondering can we put one on there could you please comment me back and let me know thank you and have a blessed day 🙏

[@MikeMcclain-z9g]

Are they anything you can flush your motor out with if it is stopped up? I have replaced the water pump and the thermostat on mine and I still can't get it to come water come out

[@zellerized]

Impeller installed upside down?

[@MoaisiSito-d6q]

15 horsepower for my engine very hot I take out cooling system but still hot what I can do for it

[@joeconner2669]

What temp should water coming out the the motor?

[@oseeuwimana8202]

please can you send me a video that can show me how to replace gasket cylinder head of yamaha F40JMHD. (6GLK L 1000094) and how to put on timing the engine after replacing that gasket. I am in Africa my country name is Rwanda

[@dustinschmidt5279]

Will too much 2stroke oil cause an alarm and limp mode on Yamaha 115?

[@shannonevans2541]

a bad oil tank level sending unit will

[@abishaifernandez1983]

Recently serviced a 10 yr old Yamaha F9.9 JMH L 4 stroke tiller handle which was mostly used in fresh water prior to us buying it, and for the past month using it in saltwater. I've got the following parts :- Cylinder gasket not changed Carb repair kit - parts replaced. Water Pump repair kit - impeller and gasket replaced. Fuel Pump - replaced Water Tube - not replaced Spark Plugs - both spark plugs replaced Engine Oil - changed Gear Oil - changed Oil pump gasket - not changed. Now the issue is, hardly I run it for an hour or two continously, and then run it on idle, it switches off, and refuses to start for the next 20 to 30 mins. Can't quite figure what the issue is. Can anyone help. P.S: doesnt overheat.

[@jerrypack726]

How many thermostat,s does a 2003 evinrude 225 have?

[@dustinschmidt5279]

Your videos are very appreciated!

[@tuckswanger]

Thanks for you knowledge

[@alanschreck8729]

My 1998 Vmax over heating alarm sounds after it has been trimmed up for a few minutes. The intake is still under water and pushing water out the exit port. Not sure what might be causing this.

[@josemariatrueba4568]

Double spark maybe? Does your engine stop suddenly the movement from the starting motor when you try to start the engine? An out of time spark causes an explosion that stops the movement of the heavy flywheel? Heating may occur if an out of time spark reaches a cylinder besides the right in time spark works alright. Replacing the two ignition units that send voltage to each coil may solve the problem.

[@EasyBookReviewClub]

Another great video! 👍🏻

[@patferrell3209]

Where is my thermostat located on my 40 horse marinertwo strokeoutboarb92 yr model

[@davidward5199]

What about the popet valve or check valve

[@dennisberry9621]

how come you did not mention the poppet valve which causes a lot of blown engines?

[@WesWhaley-tw5ms]

How do u determine that a poppet valve is faulty?

[@tomireland6096]

What about poppet valve failure?

[@RobertWebb-cv8do]

200 mercury yr 2000 changed impeller both thermostats all water stops took out thermostats motor now pissing but still running hot 200 degrees

[@branonbaker5963]

What about the poppet valve

[@eggrolll]

I have good water flowing from my tell tale, but not from the thermostat housing. I put a new impeller in and it didn't fix the overheating issue. Water only comes through the thermostat housing when I give it throttle, and it's still intermittent at best. Anyone know what this could be?

[@andrewjernigan799]

I think I’m having the same issue I have a late 80s 150 pro v

[@chuckbennett4526]

I'm having the same issue with a 15hp Suzuki 4 stroke. It pumps water good out through the tell-tale but overheats. I put a brand new thermostat in and it's no better. Only way I can get it to run without overheating is to take the thermostat out. Anyone know how to troubleshoot that?

[@allanthomson4639]

thank you

[@johnroberts1509]

Great Video!

[@alextellez3098]

I have a 1999 evinrude 225 and shut off when it get hot

[@Pip-qf3fv]

Nothing coming out, but motor is running only a little hot🤷‍♂️🤷‍♂️🤷‍♂️. Notice water coming out at top of lower unit looked like anyway

[@SteveGriner-n6x]

Have a problem Mercury 150 over heating. Boat man he hired couldn't fix ,,,, please help

[@kylebell850]

Be awesome if you would answer folks questions

[@halmer76]

Do you have any videos for #5 clearing an old outboards water passages?

[@danieln3999]

Remove the head(s) and manually clean or run a weak acid solution up through water tube and through cooling passages. Flush with clean water after.

[@jacobakkari6774]

See for me it’s still like overheating but it is also pissing water so I don’t really know

[@HarrisonBourne]

I’m here just to hear him say water.

[@allanabuan8889]

Complete overhauling please

[@georgeanddaddecker7563]

Poppet valves?

[@paulmarriott3885]

50hp four stroke yamaha pees hot when idle but runs cool when idle up

[@davidheitman7004]

buy factory parts!

[@richardhunley2490]

Need a water pump for a 1970 mercury 40 hp outboard motor

[@jackfrosty79ify]

Mine was smokeing bad then died .

[@dustinschmidt5279]

We’re you getting an alarm?

[@jackfrosty79ify]

No didn't have 1

[@tlchild49]

More info 1- Engine overheated no tell tail 2 - Flush engine then restart engine - overheated again 3 - removed the cooling water intake port cover and found some black rubber like chunks 4 - Flush engine again then restart engine - overheated again

[@wg1408]

Black chunks= impellor is destroyed. That's what I just learned. Not too difficult to replace.

[@fabian4213]

The impeller is made of black rubber. Change the impeller and blow compress air thru the pee hole to dislodge any remaining pieces. Take the thermostat off blow air from the bottom water intake vents. Need to get all pieces out or they will block the passage ways.

[@tlchild49]

@@fabian4213 Thanks for your help I learned that there are 3 water intake opens and when using ear muffs to run the engine the 3rd opening needs to be blocked so air cannot enter the pump causing the impeller to overheat and disintegrate into pieces.