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I idle out to open water for 10 minutes under normal engine
I idle out to open water for 10 minutes under normal engine temp..... once on open water after running up on plane for a few minutes the temp creeps up to around 240 and alarm sounds...... after idlin… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
I have a 350 merc magnum engine 2014 bravo 3 with 200 hours
I have a 350 merc magnum engine 2014 bravo 3 with 200 hours on it .it over heats when over one third throttle. we changed water pump on engine and the thermostat and cleaned the bypass valve. we haven… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Accidentally got water in fuel drained tank took carbs off
accidentally got water in fuel drained tank took carbs off cleaned with carb cleaner and air runs good but pull into full throttle runs for a bit then dies brought home took off fuel pump and took apa… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
I have a 2002 Key West 1900 Sportsman with a 2005 140 4
Hi. I have a 2002 Key West 1900 Sportsman with a 2005 Johnson 140 4 stroke on the back. I was told that the boat never had any problems with the motor but on my first trip out in the gulf with it, it … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662.
engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662. use boat in saltwater, engine is open cooled system using seawater for cooling. Temp are running between 185 and 205 on gauge on boa… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
2007 mercruiser 5.0 MPI, just replaced raw water impeller,
2007 mercruiser 5.0 MPI, just replaced raw water impeller, thermostat, oil, plugs, drive lube and engine runs smooth but using an IR gun thermometer I get 90F on top of riser, 180-185 on lower sides o… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
On a 350 carbed mercrusier, both waterpumps just replaced,
On a 350 carbed mercrusier, both waterpumps just replaced, runs hot ,sets off alarm after 45 mins at idle 700 rpms. Boat is in water, cools down to 170 after running 2000 rpms for about 4-5 mins. Shou… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
2003 Mercury 115 HP EFI Four-stroke, Saltwater, serial number
2003 Mercury 115 HP EFI Four-stroke, Saltwater, serial number # XXXXX Ran fine until I pulled another boat, now it will not run above 4000 rpm under load (in gear). Seems guardian mode kicked in and i… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
I have a 2007 sea ray 230 select with a 350 mag and bravo three
I have a 2007 sea ray 230 select with a 350 mag and bravo three deive. The other day we took it out and I ran it WOT with the captains call on it ran hot after about 10 minutes. We shut it down to coo… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
2005 Mercury 150 hp, saltwater alarms continuously, when temp
2005 Mercury 150 hp, saltwater alarms continuously, when temp is about 200 t0 250. This problem began when boat was about 20 hours in service. Reported this to Dealer who changed water pump, at a cost… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
Im having a problem with low idle and a primer pump bulb not
I'm having a problem with low idle and a primer pump bulb not staying firm on a Johnson 115 motor (1995). I just had the boat in for tune up/repairs and first time I took it out it started and ran fin… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Hello, I have a 2005 Johnson 90HP Saltwater (J90PLSOA) and
Hello, I have a 2005 Johnson 90HP Saltwater (J90PLSOA) and back in February we were cruising a river channel. I had been idleing most of the time to avoid hitting any stumps when I thought I was in th… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Hi there, New problem. Im running hot. in slip get up 145
Hi there, New problem. I'm running hot. in slip get up 145 fast. Driving goes to 170 and keeps creeping up to 180-190 so I shut it down. Then creeps up to 200 with engine off. Turn it on temp goes dow… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
Ford Mustang Boss 302 was running my ford 302 inboard engine
was running my ford 302 inboard engine the other day with hose water hook up ears...and noticed it ran kind of hot ..almost tea temp water comming out...seemed to be spitting water out exhaust dischar… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
i have a 2000 johnson 115 hp boat motor.i dont get to use it
i have a 2000 johnson 115 hp boat motor.i dont get to use it much but i do start & run the motor monthly.last month when i started it,it would not hold @ idle,then it stalled out and would not start.t… read more
Shane Creekmore
Shane Creekmore
Certified Mercury Marine technician
High School or GED
535 satisfied customers
i have a dd 8v53 in a 30 egg [custom job] ,temp gauge reads
i have a dd 8v53 in a 30' egg [custom job] ,temp gauge reads 100 or less at idle, when i bring boat to plane [2200 rpm] and then back off to below 2000 rpm temp rises to 180 and stays there.if i open … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
3,847 satisfied customers
I have a Mariner Optimax 135 HP outboard (2005 mod). The issue
I have a Mariner Optimax 135 HP outboard (2005 mod). The issue is that at idle speed the temperature stays steady at about 140 degrees F, and by increase the engine speed to about 1600 rpm the tempera… read more
Jason
Jason
Associate Degree
210 satisfied customers
I have a 2001 4.3L V6 Mercruiser with an Alpha outdrive. The
I have a 2001 4.3L V6 Mercruiser with an Alpha outdrive. The stock one piece exhaust elbows rusted out and water got into the engine so I pulled the motor out and rebuilt it. The heads were taken in a… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
3,847 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

2,678 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

22,043 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,409 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,730 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

3,847 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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