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Joseph
Starting Member
36 Posts |
 Posted - 10/21/2009 : 9:53:29 PM
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| I have a 1991 Yamaha 150 ProV. I rarely run it at full throttle, but several months ago I did & after a few minutes the alarm went off. I shut off the motor and after a few minutes started it again and ran it back to the launch at about 35 mph with no alarm or other problems. I changed the water pump after that trip, but yesterday took the boat out again, ran it at full throttle & the alarm sounded again after a few minutes. I waited a couple of minutes, started it up and ran back to the launch with no further problems. Any ideas what the problem might be? |
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jamaio
New Member
USA
16 Posts |
Posted - 10/21/2009 : 10:09:37 PM
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Did you replace the thermostat when you replaced the water pump? Restricted water flow at higher RPM's can cause the engine to over heat.
How does the water flow look when running?
Engine timing that is off can also cause the engine to overheat, I am not sure how the timing is set up on that motor, maybe one of the more experienced motor mechanics can comment on that.
2003 Fishmaster 186V Suzuki 115 4 Stroke |
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frogman
Average Member
USA
238 Posts |
Posted - 10/22/2009 : 1:26:51 PM
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Apparently you do not have a water pressure gauge. This would tell you if you have a water pressure problem and possibly eliminating the need to unecessarily replace water pump and focus on either a restriction such as a sticking thermostat or debris. Also sometimes there is a growth that will form inside the water jacket that will need to be cleaned out by removing the heads.
This is a pretty common problem.
Hope you get it figured out soon and suggest installing a water pressure gauge, which to me, is a very important/helpful addition to your ability to stay in touch with your outboards needs and performance. |
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Joseph
Starting Member
36 Posts |
Posted - 10/22/2009 : 8:06:58 PM
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| The water flow looked strong while running. Changing the thermostat seems like something I could do. A timing problem sounds a little more difficult. Thanks for the advice. |
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ed mcintyre
Administrator
USA
6079 Posts |
Posted - 10/22/2009 : 10:30:22 PM
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also make sure your depth finder/gps are not on!! ask john c.
remember we did not inherit these resources from our parents, we are merely borrowing them from our children |
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Murf
Average Member
USA
247 Posts |
Posted - 10/22/2009 : 11:06:53 PM
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Ooooh Ed, did you really just go there...?? Seriously, check out previous posts by John C, he had some problems with his depth finder's shallow alarm sounding identical to his Yamaha's outboard overheating alarm. Ruined his day and cost him a few $$. Post a question and I'm sure he'll be happy to give you details.
Murf |
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JOHN C
Advanced Member
USA
2024 Posts |
Posted - 10/23/2009 : 7:51:12 PM
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Yup, my Lowrance 59X depth-finder was inadvertenly set for max depth at 8 feet (minimum set @ 3 feet and max set at infinity-don't really care how deep---JUST HOW SHALLOW). Everytime I got into water over that depth, the alarm went off. Even the head mechanic at Cypress Cove Marine said that in all of his 19 years of servicing Yamahas, he had never heard another alarm almost identical to the heat alarm on Yamahas.
Additionally, had another alarm going off, but did not end my trip...found out it was the alarm from my Fuel Management System...forgot to reset back to 40 gallons (indicating only 15 gallons remaining in tank) after refueling several times since a week long stay in Grand Isle.
New SUV-'06 Yukon, new 56 yoa house, new boat-'06 Avenger, Semi-retired-'07, soon to get "new-wife"-'09 and in debt for the rest of my life-Now&4-ever!!! |
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hukum
Starting Member
USA
20 Posts |
Posted - 10/30/2009 : 5:08:05 PM
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| Had similar problems with my 2001 Yamaha 115. Changed water pump, did OK for a while, alarm again, changed thermostats, again OK for a while. Alarm again, removed thermostats completely, OK for about a year. All work done by reputable mechanic. Alarm again, corrosion in water passages. I understand that is quite common in Yamah motors of that type. While it only alarms when run near wide open throttle, I plan to have it cleand out during the winter when shop is nhot as buisy. |
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Joseph
Starting Member
36 Posts |
Posted - 11/07/2009 : 07:56:05 AM
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| Is cleaning the water passages a do-it-yourself job? I do use the ear muffs and run fresh water thru it after every trip. |
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Luv2Ketchum
Junior Member
USA
120 Posts |
Posted - 11/11/2009 : 11:52:23 AM
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quote:
Originally posted by Joseph
Is cleaning the water passages a do-it-yourself job? I do use the ear muffs and run fresh water through it after every trip.
Am having the same problem, I understand flushing with'ear muffs' does not do a very good job of rinsing the cooling system. I am trying to get information on connecting a garden hose to the engine block, forcing water into the cavities without running the engine. 
"Tight Lines, Bent Rods & Screeeeeeeamin Drags"
C'mon,one more cast! |
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Tailwind
Average Member
212 Posts |
Posted - 11/11/2009 : 8:11:14 PM
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Any ideas what the problem might be?
Absolutely:
Old mechanic please chime in,
My bet is your alarm wire.
First, remove the alarm wire lead at the motor, and ground it by placing it at ground such as adjacent to a spark plug. The alarm should sound. The alarm circuit is made by the ground wire.
If your alarm chimes, then you have a problem within this circuit - most likely the alarm wire is chafed, and getting a ground from somewhere within your wiring harness. No Problem, get a volt / ohm meter and check the wires for continuity back to the alarm buzzer.
Wiggle the wires, until you find the grounding.
Basically, think of it as a light socket: Power to one side of the guage, and ground to the other.
And always remember: There are no problems, only solutions!
Randy |
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Sportsman's Paradise Vol 09-37
Alarm buzzer
