Mercury 1.0L class Overheating/Guardian mode fix

[@BillORights1]

good vid, note: while you got it out, place the tstat in 140 degree water. it should slowly open, then put it under the cold water faucet, it should completely close! then put a little grease on the bolt threads😀

[@mattlaughead1940]

Scoured internet forever, watched your video and pulled my thermostat tiny pebbles ! Much appreciated on the info

[@extremeboating7347]

Awesome man! That's the kind of stuff I like to hear!

[@MrDonaldRich]

Good Information, Thanks!!! I wish I would have saw this before I started on mine. I just got the boat recently and it started throwing an alarm. There was obvious signs it was overheating and going into limp mode. I dropped the lower thinking the impeller failed but the impeller was good. What I found was the thermostat and housing was clear full of sand. Had I known what was going on I wouldn't have hesitated to pull it apart on the lake as it was a very long trek back to the dock with the 5 hp kicker. Cheers Don

[@extremeboating7347]

Knowledge is power Mr. Don! You may not have found out soon enough to deal with it this time, but next time, you know exactly what needs to be done to fix it.

[@MrDonaldRich]

@@extremeboating7347 absolutely!!!

[@gosteelers8322]

"MANY THANKS" for your input, insight, and recommendations when performing these highly recommended maintenance tasks or checks on the "cooling section, tell/tale tips, operation, & components" for any Mercury outboard motor. Great info for any Mercury Outboard owner and DIYer for sure!!

[@extremeboating7347]

Thanks for your feedback and for watching brother! Happy boating!

[@gosteelers8322]

@@extremeboating7347 You're very welcome.

[@Steve-qo4hi]

Great and helpful video! Thank you!!

[@ryanarmentor669]

Great video, Where did you get your motor cover?

[@extremeboating7347]

Thanks Ryan! I got my cover from outboardcovers.com. They can custom make them to the style you want.

[@ryanarmentor669]

@@extremeboating7347 thank you very much for the reply!!

[@ryanarmentor669]

I ordered a new cowling cover. I wonder if I could mail it to them so that they can print the mercury logo on the sides or if you have to buy the cover from them?

[@extremeboating7347]

@@ryanarmentor669 oh you probably have to buy the cover from them. They are based out of Australia, so the chances of them doing that and getting it back to you within the year are slim. Lol.

[@BrianRockFishing]

Right on bro. I'm having overheated alarm on mine as well...I have replaced my thermalstat for my motor there are 2 of them...I have replaced my poppet vale and also my water pump all relatively around the same time since each one of those I replaced I went and tested the motor on the water and the alarm still beeping. So even with all those 3 components replaced the motor still overheated alarm goes off. When I look at the motor it was hot steaming coming out of the exhaust. Do you happen to know what else that can cause it?

[@extremeboating7347]

A blown head gasket. Especially if it's coming out steaming. That's a pretty big indicator unfortunately.

[@tolotomas]

Good video, thanks for your help. I have a problem but when I have the motor in low. It sound a long beep. I check the pee hole water and it too hot (burning), so I understand that can be a problem. Impeller is changed every year, and I can see that maybe the problem is in the thermostat. I'm going to try to clean it! do you think that's the reason? (I talk about salt water!!)

[@extremeboating7347]

If the pee hole is too hot the thermostat is most likely not opening. I would try to change it and/ or if you don't want to try that first I would put it in boiling water to see if it opens up. If you do replace it, and it continues then you have a problem with the powerhead/ head gasket guaranteed.

[@tolotomas]

@@extremeboating7347 Thanks! It seems that worked! I want to share how the thermostat was... really bad! Anyway I could cleaned it and also clean the refrigeration circuit adding some vinegar. My idea is repeat the cleaning in a short term! Watch how it was!! : kzbin.info6VzOJQQJvK4?feature=share😲

[@extremeboating7347]

@@tolotomas wow. That's incredibly disgusting. Haha. There you go though! I'm glad that's all it was and is now resolved!

[@FranklinHicks-qs4gs]

Where'd you find that sweet cover

[@extremeboating7347]

I got you covered (no pun intended!) 😆 kzbin.info/www/bejne/mYjdkIOflLSMaZY

[@carlosprince1499]

Cover the termostato

[@extremeboating7347]

What's the thermostat have to do with this question?

[@carlosprince1499]

Qatar

[@carlosprince1499]

Termostato manifor

[@kahnkhairi9714]

Really nice explanation thanks so much

[@extremeboating7347]

You're welcome and thanks for watching! I hope the video was helpful to you.

[@marks6072]

Ran my Bass Tracker 50 into a sandbar and immediately had overheat issues (no physical damage)... 40 hours total on the motor & it went over 210 degrees per VesselView app..... RPM limited to 2000... I will try all suggestions in this vid... What about remove thermostat cover and thermostat and connect hose muff to lower unit and run engine for a minute or so on open thermostat??? Does this 50hp have a poppet valve i should replace??? Many thanks for posting this vid!!!!

[@extremeboating7347]

If you ran into a sandbar so much to the point where you are overheating the sand went all over the cooling system. Remove the stat and run it every possible way you can. I wouldn't try running the outboard without a thermostat unless the system is all closed up. The 2000 RPM issue is a guardian enabled running condition to decrease the possibility of blowing your head gasket. As for the poppet valve that is integrated into the thermostat. If there is any doubt the thermostat is no longer functioning correctly then I would replace it. You may need to flush out your system several times to be honest but I would first start with the muffs hooked up and run that for a few minutes, then hose threaded into the back to begin the backflush, and finally with the full thermostat out and gunk it has stuck to it cleared out.

[@johnvgig]

You mention a screen fix for the inlet. Any info on what that looks like?

[@extremeboating7347]

Not currently, as that is something I have not done yet myself despite having recently taken the lower end unit off to grease up the driveshaft. That is something I do plan on taking care of at some point, but as annoying as it is to put the lower end unit back on I'm going to put that on hold until I have to take care of the impeller.

[@outdoor_alaska4790]

I got a 2023 Seapro 200hp brand new last week. I followed the manual for the break in period and around 17 hours I was cruising across clear ocean back to port and got the guardian mode…I eventually went down to 1000 rpm and had to putt back to port. I had checked the lower for obstructions as it was saying it was over heating, didn’t find any. I dropped it off at the dealer and they said they have no idea right now what caused it. Any experience with that? I confirmed I didn’t hit anything, go through a scum line in the water, or anything but regular operation.

[@extremeboating7347]

Have them perform a cylinder leakage test across the cylinders. It almost sounds like you have a blown power head gasket.

[@outdoor_alaska4790]

Thanks for the response. They just called and said it was a faulty thermostat. I asked if they checked anything else and they did not and said all else seemed find aside from the thermostat sticking open. I’ll ocean run it next weekend to see I suppose. They replaced the thermostat and said it runs normal now…

[@extremeboating7347]

@@outdoor_alaska4790 excellent! I'm glad it wasn't anything big, and thermostats can fail anytime so I'm inclined to believe that it was indeed your issue.

[@rmswenson747]

i would think removing the thermostat and replacing the thermostat cover, and then reverse flushing with a hose attached to the pee port would be the most efficient...thoughts?

[@extremeboating7347]

If you do that every single time you get junk in there (which would be quite frequently if you are in a lake or reservoir) you will be spending a ton of money on something that is not needed in the first place. A simple clean out and proper reverse flush through the thermostat hole is sufficient.

[@rmswenson747]

@@extremeboating7347 thanks for the feedback, but i am unclear on what i would be spending money on? i am suggesting to remove the thermostat, put thermostat housing cover back on without thermostat, reverse flush (not having to worry about making the thermostat hot/open). when done, re-install the thermostat, and be done with it. where is the expense?

[@extremeboating7347]

Ah! I see what you're saying. I wouldn't run it that way because the PCM is looking for proper temperature control.

[@jessebanuelos4821]

We’re did you get that engine cover I want one..

[@extremeboating7347]

I made another video on it shortly after I made this video. If you have an engine smaller than a 2.1L (75- 115HP and above) watch my video. kzbin.info/www/bejne/mYjdkIOflLSMaZY If you have a 75 HP and up, hit up the Mercury Dockstore.

[@clintXknox]

Which is the correct size for a themorstat replacment for a Mercury 60HP?

[@extremeboating7347]

You are going to have to consult with their online catalog for the correct PN or with your local dealer to find that. I have not replaced the T- stat yet on my own outboard so I haven't had a reason to look up the number yet.

[@ToomersCruiser]

You mentioned that you can’t do an on water fix. When my 2005 50 hp ELPT stops pissing I use a hand-operated Guzzler pump to reverse flush and I’m pissin’ again. Moreover I use a quick connect to make the connection without having to turn the male end of the hose to thread it into the motor.

[@extremeboating7347]

That's actually good info but the real fix if you get too much of it in there is to remove the thermostat and flush it out with a garden hose like you saw towards the end of the video and there is no way to do that on the water if you ingest too much junk through the inlets.

[@mikewhitton4553]

Hey I have a question bud. Is 6beeps overheating on a 40 hp mercury 2012 ?

[@extremeboating7347]

If I remember correctly, that's usually indicative of a sensor failure or trouble code issue on Mercury's. What seems to be the issue you are having?

[@mikewhitton4553]

I was out on the lake and everything was good on my 2012 bass tracker and I was going to go to my next fishing spot and not long after I plained out the boat started to bog down and I heard 6 beeps it never died would idle fine but if I gave it more throttle it bogs and I would get the warning beeps

[@mikewhitton4553]

Thanks for your time really appreciate it.

[@extremeboating7347]

That sounds pretty much like a staple feature of guardian. The best way to reset guardian is to put the throttle handle into neutral, wait a few seconds and then you can resume running at regular speeds. Just don't bring it back up to wide open throttle because like my video, it will put you back into guardian due to debris blockages in the cooling system. If the issue persists, then it is not an overheating issue and you have other issues in play which will require you diagnose it or take it in to get the code read. You have an older model, however, so locations may be different as far as the thermostat goes. You also wouldn't have the hose inlet on it, but regardless, after you get that t- stat off you can definitely reverse flush your outboard.

[@dd1273]

@@extremeboating7347 have you found the problem of the 6 engine beeps, I have the same thing now, the engine starts flawlessly and never beeps when the engine is stopped. just when I start to leave. 6 beeps a little when he wants. the wash bottle is good, no loss of power ???

[@mayachapman1744]

Right on 🍺

[@denislalonde9747]

I think you have another stat on the othe side about the same location Check it out

[@michellefebvre3348]

Great video! My 2010 mercury 75hp 4 stroke is at the shop for an alarm I’m getting but only at 1000 RPM. (long beep). The motor is peeing steadily with a nice cold to lukewarm stream. No power loss and the motor runs smoothly. The shop scanned revealed no fault code. The shop wants to continue investigating and charging me like crazy. I don’t know what to do anymore. Can you help me please 🙏. Cheers!

[@extremeboating7347]

What kind of water pressure are you getting at idle and what happens when you try to give it any sort of throttle? A stream is never an indicator of correct water pressure. I have never seen a long beep before so this is going to require some patience and maybe even some testing on your part if we are going to try to solve this together. I have a 115HP now which is on the same engine block as a 75 so this is a good one for the both of us.

[@michellefebvre3348]

@@extremeboating7347 I don’t know the water pressure since I don’t have a gauge or any tool to measure it. If I can have my boat back from the dealer. I’m thinking of buying the Mercury Vessel View monitor. When I first heard the beep I put the throttle to neutral and it stopped. After 2-3 minutes, I came back home with medium to almost WOT without any alarm. After 10 minutes, I slowed down at 1000 rpm and the alarm went off again. If it wasn’t from that alarm I would say that the engine runs great.

[@extremeboating7347]

That's weird. I know that vesselview records long term stuff and stores it so it is really useful. I almost wonder if you are having some sort of throttle body synchronization issue. Just know that water pressure is not recorded to vesselview unless you have a digital water pressure sensor installed so you'll either need to install a manual one or a digital one prior to getting that info.

[@michellefebvre3348]

@@extremeboating7347 thanks for your input. The dealer talked about a lift pump issue of some sort. I asked them to stop investigating for the weekend in order to stop the bill from running. I might go get my boat back before getting ruined. Thanks again and I’ll keep you posted.

[@extremeboating7347]

@michellefebvre3348 it may very well be a fuel issue. Mercury in general is known to use cheap fuel pumps so it may be worth hooking up a fuel pressure gauge to it to take a look at idle pressures. You will need muffs or some sort of way of running the outboard while the gauge is hooked up to it.

[@Jambo29709]

What about how to get it out of the guardian mode?

[@extremeboating7347]

I can make a video of that if you'd like me to but it's insanely easy to do though and only requires you put it in neutral with the engine still running and wait 2 or 3 seconds before putting it back in gear and normal operation resumes as necessary.

[@Jambo29709]

@@extremeboating7347 No, This didnt work.

[@extremeboating7347]

Then you have a hard issue going on. More than likely an engine code that requires you correct the issue before it will take you out of the reduced power mode.

[@joshatkinson4880]

What is the part number 14 60hp

[@extremeboating7347]

What's the part number for what?

[@thatflippinrabbit954]

Only if it was that easy on a salt water motor with calcium build up making the overheat alarm go off.

[@extremeboating7347]

Yeah I know right. Unfortunately there is absolutely no good solution for salt water usage other than frequent cleaning.

[@bennievillanueva4052]

I can’t get mine to go faster then 320 rpm

[@extremeboating7347]

Do you mean 3200 RPM?

[@bhoits4147]

So what did you do?!

[@garyradtke3252]

It's not a design flaw. If it had screens it would stop up quicker and cause impeller damage. If you look at other Merc's and brands you will see many of them don't have screens either.

[@extremeboating7347]

I have looked at other Mercury engines and they have some sort of screening there to keep from sucking up excessive weeds and such. I guess if you look at it from one point of view or another either one is an issue, with or without screening.

[@jordanfriar8732]

Its only 10$ for a new thermostat just pop in a new one

[@extremeboating7347]

After every 3 or 4 outings? That would be a serious waste of money, not to mention the time it takes for you to swing by a dealer to pick one up. That assumes that they even have them in stock at the time that you need it considering that boats these days are assembled via mail order.

[@Wilderness87]

Thank you