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Brand New Merc 115 Overheating
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| Malikknows |
Posted on 07/16/10 - 11:37 AM
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Just bought a new 190 Montauk, took it out over the weekend and it overheated 3 times. Beeping and automatic shutdown. Dealer ran tests and thinks it was sea grass. I don't believe it. Any ideas on what to do next?
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| DWinter |
Posted on 07/16/10 - 12:37 PM
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Run it on the hose, check water flow at the tell tale and shoot the temps of the heads with an infrared thermometer. Brand new motors don't just overheat, something caused it. A restriction in water flow is the most likely cause. Did you run in any shallow water. Is this your first boat or 10th boat. Don't mean to pry but these questions really do lead somewhere.
Duane G Winter
1984 BW Sport 15 Center Console |
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| Malikknows |
Posted on 07/16/10 - 1:08 PM
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Not prying at all. Appreciate the questions. First powerboat. Switched from sailboats with small outboards that never had a problem. 3 instances of overheating: first, in ICW in Sarasota after about 2 hours of running; second, next day, also after about 2 hours of running; third, 20 minutes after 2nd incident. Running about 4000-4500 with about 8, 11 and 11:20 hours on the engine. Not in shallow water before first occurrence. Dealer ran it for 45 minutes and couldn't get it to repeat. Computer data shows overheating codes.
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| whalerman |
Posted on 07/16/10 - 1:28 PM
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Running on the hose won't give you an accurate running diagnosis. Run in the water or with a test wheel in a propper test tank. Do you have anything attatched to the transom that would interfear with the water flow or, anything mounted on the hull that would interfear with the flow of water to the lower unit? Was the water rough that day? At what height is the engine mounted, av plate in relation to the keel?
THOM : 1999 Outrage 18, 2012 E-TEC 150, 2012 EZ Loader trailer |
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| Malikknows |
Posted on 07/17/10 - 5:06 AM
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Nothing but a depth finder on the rear transom, far from the engine. First instance smooth water but lots of wakes at time of incident. 2nd and 3rd instance in 3-4 seas and I did think that might have something to do with it. It was hot down here in FL last weekend, too. Engine is mounted by factory.
Mike
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| modenacart |
Posted on 07/17/10 - 5:38 AM
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Is the engine broken in yet?
They that give up essential liberty to obtain a little temporary safety deserve neither liberty or safety.
--Benjamin Franklin |
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| John Fyke |
Posted on 07/17/10 - 6:09 AM
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It's not unheard of for an impeller to break up and lodge in the water passages even on a new motor. Happened to a friend of mine. Something to check out. Good luck.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| duf |
Posted on 07/17/10 - 6:18 AM
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i had the same problem with my almost new ETEC. After tons of trouble shooting by my mechanic it was discovered i had replaced the little water valve you remove when you flush the motor to screw in the hose. When i unscrewed the hose, and replaced the valve, i had mis-located an O ring. It was still on the valve, but in the wrong place. So simple, yet my ETEC was doing the same thing, throttling down with the over temp alarm going off.
Duf
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| JohnnyCW |
Posted on 07/17/10 - 9:43 AM
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John Fyke wrote:
It's not unheard of for an impeller to break up and lodge in the water passages even on a new motor. Happened to a friend of mine. Something to check out. Good luck.
I had trouble with a new motor several years ago. After weeks of troubleshooting and having no luck, we eventually decided to inspect the impeller. Sure enough it had significant damage. The housing showed signs of melted rubber indicating the motor had been briefly run with the pump dry. Even just a few seconds drying running the pump can destroy an impeller. The motor had been purchased already installed on a new boat that had been on the dealer's lot for a few months. Its likely somebody briefly fired the motor with the boat sitting on the trailer. Its a practice I have witnessed repeatedly at ramps with the owners claiming they're just making sure the motor successfully fires before they dump the boat into the water. Not a good idea.
Fortunately I got a good 10 years of trouble-free operation out of that motor before I sold the boat though the issue when it was new aways worried me a bit in the back of my mind every time I took the boat out.
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| whalerman |
Posted on 07/17/10 - 1:13 PM
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Mike, have the dealer change out the whole water pump assembly, under warr. should cover it. Try the engine again and see if that corrects the probblem. As stated in previous posts, the engine was probbly started with out water to the pump and it only takes a second to damage the impeller
THOM : 1999 Outrage 18, 2012 E-TEC 150, 2012 EZ Loader trailer |
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| Phil T |
Posted on 07/17/10 - 3:33 PM
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Was the engine trimmed out while at 4k? You might have been trimmed out to far and the EMM sensed low water pressure or high temperature.
What error messages and/or codes were found by the dealer?
Edited by Phil T on 07/17/10 - 3:35 PM
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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| CES |
Posted on 07/17/10 - 7:08 PM
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If I were to listen to anyone, it would be Duf. I know he knows his Etec well.
Cliff
1966 13' Sport with a 1993 40hp Yamaha 2 Smoker |
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| Malikknows |
Posted on 07/18/10 - 2:12 AM
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All: Great suggestions. I'm taking the boat out today, if it overheats again, I'll bring it back to the dealer. To your questions:
-Break-in on new engines is easy. Has about 12 hours so, yes, I think it is broken in although I'm pretty easy on it.
-Yes, engine trimmed slightly according to dealer recommendations. Not sure this could have been a factor.
-I'll check that O ring but I didn't see one when I flush. Simply screw the hose into the coupling. Good idea.
-Boat was delivered from the factory to the dealer 5 days before I picked it up. If someone burned out the impeller, he should have known better. It wasn't me!
Thanks to all,
Mike
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| duf |
Posted on 07/18/10 - 5:03 AM
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Appreciate the vote Cliff, but all are good suggestions. You know me, i go with the "KISS" theory "keep it simple stupid" and its always a good idea to check the simplest things first. I have to admit though, it drove my mechanic and me nuts trying to figure that one out. One only has to look at that old thread to see how long we wrestled with the over temp problem and how many folks tried to help out.
duf
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| mavenmatt |
Posted on 07/19/10 - 7:31 PM
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I also just purchased a slightly used 115 19 ft montauk. I bet less than 40 hrs. Before my first run i wanted to check water cooling flow. Looked good on a hose but want to check it without hose pressure. Bought a large storage container, big enough to fit the lower end in. 7 bucks. At idle had good pee action but only 1 psi pressure. 10 psi at 2K rpm. For 24 bucks and a morning worth of work i changed the impeller. The old one looked perfect but put the new one in anyway. Put it back in the container and at idle the pressure jumped up to 6 psi. I would have never bet on it??? It also only takes about 10 mins to check the thermstat. Two screws and your there!! How about oil level?? If all three are good, i might have agree with weeds. It has happened to me, but had to have been a "lot" of weeds!! Let me know what you find!!!
Whale on!!!!!!!!!!
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| MW |
Posted on 07/19/10 - 10:36 PM
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I'm wondering about the thermostats too.
Matt |
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