Merc Alarm

Ralph Wiggum
Maple Grove, MN
Posts: 11764

July 5, 2012 at 6:17 pm #1239019

I started having an issue with my 1993 Merc 60 hp (2-stroke, 3 cylinder, tiller, oil-injected, power trim).

It started sounding a continuous alarm on plane. It briefly went away, but soon started again. I believe the continuous alarm signals overheating, but the motor is shooting a strong stream, so I believe the impeller is fine. The alarm also sounds continuously when I turn the key on but don’t start the motor, so I believe there is either something wrong with the sensor or the alarm module.

Any ideas how to trouble-shoot the culprit?

sandmannd
Posts: 928

July 5, 2012 at 6:28 pm #1081342

I had the same issue with mine on low speeds a couple of years ago. The water stream was strong but still overheated. Then it started to do it on plane. Had my impeller replaced and all is well. Just because you have a solid stream doesn’t mean your impeller is in great working order.

Steve Root
South St. Paul, MN
Posts: 5623

July 5, 2012 at 6:36 pm #1081349

Quote:

I had the same issue with mine on low speeds a couple of years ago. The water stream was strong but still overheated. Then it started to do it on plane. Had my impeller replaced and all is well. Just because you have a solid stream doesn’t mean your impeller is in great working order.

Ryan I have the same motor as you. Last fall it would sound the high temp alarm after trolling for a while, and then it would go away if I ran around at higher speeds for a while. I was getting a steady stream of water out the pee hole too.

I replaced the impeller (Many thanks again Jon J.!) and that eliminated the alarm problem. The other thing I noticed is that the stream is MUCH stronger than it was before. At idle, the sound of the stream hitting the river can be heard over the sound of the engine, and it pokes a hole an inch deep into the river. The conclusion was that even a steady stream doesn’t necessarily mean the impeller is OK.

Rootski

chomps
Sioux City IA
Posts: 3974

July 5, 2012 at 6:57 pm #1081354

yep hot engine alarm, a beep…beep…is the oil alarm, either out of oil or the cap on the oil resivoir is loose or cracked and she is sucking air, not oil.

fireline
Rochester
Posts: 813

July 5, 2012 at 7:53 pm #1081358

I have my 135 Merc in the shop with the same issues and it turned out to be the gear that drives the oil pump . Big job and LOTS of money ,hope that’s not your case .

Ralph Wiggum
Maple Grove, MN
Posts: 11764

July 5, 2012 at 7:57 pm #1081361

Quote:

Just because you have a solid stream doesn’t mean your impeller is in great working order.

I could see that being the case except I get the overheat alarm even with the motor off but the key on.

sandmannd
Posts: 928

July 5, 2012 at 8:16 pm #1081366

Quote:

Quote:

Just because you have a solid stream doesn’t mean your impeller is in great working order.

I could see that being the case except I get the overheat alarm even with the motor off but the key on.

Sure, when I had the alarm I could turn off the motor then tern the key on and still have the alarm. I’m pretty positive you have to replace your impeller.

Jesse Krook
Y.M.H.
Posts: 6403

July 5, 2012 at 8:20 pm #1081368

Start with the impeller…..when is the last time you replaced it ?

fish-them-all
Oakdale, MN
Posts: 1189

July 5, 2012 at 9:04 pm #1081393

I have had the same issue with my 99 merc 3 times. I unhook the power to the battery to resolve the issue. Then reattach and the alarm stops. I believe it is a low oil sensor that is causing the problem. Luckily it doesn’t happen that often that I have wanted to replace it.

Ralph Wiggum
Maple Grove, MN
Posts: 11764

July 5, 2012 at 10:07 pm #1081408

Quote:

Sure, when I had the alarm I could turn off the motor then tern the key on and still have the alarm. I’m pretty positive you have to replace your impeller.

I am talking about turning the key on the next day, so there is no reason it would be hot.

biggill
East Bethel, MN
Posts: 11321

July 5, 2012 at 11:52 pm #1081430

Quote:

Just because you have a solid stream doesn’t mean your impeller is in great working order.

I do believe theat the “stream” is simply an indicator that the water pump is pumping water. It doesn’t tell you how well it is pumping water.

Please correct me if I am wrong…

fireline
Rochester
Posts: 813

July 5, 2012 at 11:58 pm #1081434

Let us know what you find out .

Steve Root
South St. Paul, MN
Posts: 5623

July 6, 2012 at 1:08 am #1055463

Every time I turn the key to “on” even with the motor at room temp the beeper sounds for maybe 5 seconds then quits.

walleyeben
Albertville,MN
Posts: 963

July 6, 2012 at 3:38 am #1081467

As others have stated its not moving enuff water.

Angler II
Posts: 530

July 6, 2012 at 7:48 am #1081481

Quote:

Quote:

Sure, when I had the alarm I could turn off the motor then tern the key on and still have the alarm. I’m pretty positive you have to replace your impeller.

I am talking about turning the key on the next day, so there is no reason it

would be hot.

Sounds like your alarm is bad. Mine went out on a 93 merc 50 hp.

jac714
Posts: 37

July 6, 2012 at 12:38 pm #1081500

Quote:

I started having an issue with my 1993 Merc 60 hp (2-stroke, 3 cylinder, tiller, oil-injected, power trim).

It started sounding a continuous alarm on plane. It briefly went away, but soon started again. I believe the continuous alarm signals overheating, but the motor is shooting a strong stream, so I believe the impeller is fine. The alarm also sounds continuously when I turn the key on but don’t start the motor, so I believe there is either something wrong with the sensor or the alarm module.

Any ideas how to trouble-shoot the culprit?

Had the same problem on my 75 hp of the same era. If you remove the upper cowling you should be able to find the temp sensor, it is located at the back of the engine between the plugs on mine it may be elsewhere on the head of yours. It is a dime sized sensor that fits into the head. It has one wire attached, if you remove it from the block it will not have a ground path. If you still have your alarm it is probably not the sensor. The module is easy to replace, on mine it is located on the front left side of the motor next to the oil tank.

jac714
Posts: 37

July 6, 2012 at 12:42 pm #1081502

Quote:

Every time I turn the key to “on” even with the motor at room temp the beeper sounds for maybe 5 seconds then quits.

This is normal, it is a self test of the alarm horn to make sure it works, like most of the lights on the dash coming on when you turn the key to on.

Ralph Wiggum
Maple Grove, MN
Posts: 11764

July 6, 2012 at 3:57 pm #1081564

Quote:

Every time I turn the key to “on” even with the motor at room temp the beeper sounds for maybe 5 seconds then quits.

I get that, too, but then the constant alarm comes on. I dropped it off at the shop today, so we’ll see what the experts say. He thought it sounded like the alarm module.

jac714
Posts: 37

July 8, 2012 at 12:56 am #1081896

Quote:

Quote:

Every time I turn the key to “on” even with the motor at room temp the beeper sounds for maybe 5 seconds then quits.

I get that, too, but then the constant alarm comes on. I dropped it off at the shop today, so we’ll see what the experts say. He thought it sounded like the alarm module.

It was the alarm module on mine as well. It was an easy fix, I would guess the entire repair took me an hour and the parts were around $125 if I remember correctly so it should not be too bad.

Good Luck

Ralph Wiggum
Maple Grove, MN
Posts: 11764

July 10, 2012 at 3:30 pm #1082657

‘Twas the alarm module. I had them replace the impeller as long as I had it in the shop, so all is good to go.

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