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I have a 1998 Volvo penta Sx which overheats on plane. When
I have a 1998 Volvo penta Sx which overheats on plane. When at idle it cools down. I assume I have a leak in water tube oring but am not sure. What is the correct diagnosis procedure and what are the … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
Please help. I am having a motor heat issue on our boat. We
Please help. I am having a motor heat issue on our boat. We have QSB 5.9 370's. In May, we took our boat out, starboard engine was 200 degrees, port 175. We contacted a service company, they came out … read more
Jason
Jason
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I have a Evinrude/ 200 (VJ200TXETD) with a heating problem.
I have a Evinrude/Johnson 200 (VJ200TXETD) with a heating problem. I will start from the begining. We purchased this boat last fall from a person down the street. He was fixing it up and the last thin… read more
Tan
Tan
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11,264 satisfied customers
K, I'm trying to figure out my overheat problem, over 3000
Hi K, I'm trying to figure out my overheat problem, over 3000 rpm only. First, I had a bad stern drive, replaced it, now coincidence or not, over heating. I first pulled the lower & removed the pump &… read more
Jason
Jason
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i have twin mercrusier 496 8.1 motors closed cooling on a 36
i have twin mercrusier 496 8.1 motors closed cooling on a 36' formula. both motors overheat. replaced the thermostats and cleaned the system. still overheat. the motors start up and run after 3 minute… read more
Jason
Jason
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I have a overheating problem in a 5.7 volvo penta 1999 .we
I have a overheating problem in a 5.7 volvo penta 1999 .we have changed water pump ,impeller,cleaned risers , flused block ,changed thermostat,removed thermostat,flushed block,swapped outdrives ,used … read more
Jason
Jason
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what causes a 7.4 to run 200 degrees when its twin runs 175
what causes a 7.4 to run 200 degrees when its twin runs 175 degrees. I have changed everthing then I crossed wired everthing to the port motor.It still runs 200 deg. Ive used a laser temp. gun and com… read more
Jason
Jason
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i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold sensors throw an alarm at about 175 degrees. The engine temp with a temp gun is 165, the manifold are the same and the risers get up to 20… read more
James
James
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Vocational, Technical or Trade Scho
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hi there, 1997 38 carver sant. runs hot like 210 degrees and
hi there, 1997 38 carver sant. runs hot like 210 degrees and every part has been changed.454s 650 hours and i am afraid to go far because it will overheat.… read more
Jeremy R
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hi, i have an aqad31a,my tempreture gauge is staying around
hi, i have an aqad31a,my tempreture gauge is staying around 150 when im steaming around and then when i slow down it goes up to about 200+ and then slowly comes back down to 150 again,ive changed my t… read more
Tan
Tan
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Mercruiser inboard motor, Serial # 5770788, 165 hrsp. Problem
Mercruiser inboard motor, Serial #(NNN) NNN-NNNN 165 hrsp. Problem: Motor runs hot. Put new water pump on it, thermostat, 3 inch heat exchanger cleaned and a complete tune up on motor. Motor runs hot … read more
Yachtwork
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I have a reman 1989 merc 4.3 litre engine in my Searay. Has
I have a reman 1989 merc 4.3 litre engine in my Searay. Has an orca half closed system. The temp guage started showing a higher reading, usually runs at 185 and started creeping up over 200 while maki… read more
Master Tech
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Vocational, Technical or Trade Scho
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Hi I have a 350 mercruser engine that is running hot. At idle
Hi, I have a 350 Mercruser carburetor engine that runs hot at idle and hotter on way. At idle it runs at 145 degrees without a thermostat. On way - at the dock tied up 1200 RPMs the temperature rises … read more
Captain Dave
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How do I know if I have a bad manafold Over the winter the
How do I know if I have a bad manafold? Over the winter the antifreeze seems to have disapeared from the exchanger and when I start the motor now for the first thirty secods or so, there seems to be a… read more
Dominick
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Universal diesel engine model 5416 has history of overheating.
Universal diesel engine model 5416 has history of overheating. Currently, system has been flushed, heat exchanger cleaned, new hoses & thermostat & impeller, water pump is two years old, has 50/50 mix… read more
Yachtwork
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I have a 2001 Chaparral280 SSI with a 7.4 Merc brovo 3 outdrive.ran
I have a 2001 Chaparral280 SSI with a 7.4 Merc brovo 3 outdrive.ran in saltwater.I have changed everything in the coolong system { open cooling }Top to outdrive intake hose. At idle and WOT the temp i… read more
Pappy's Sales and Service
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Went to take the Sig 310 for a run yesterday and it just wouldnt
Went to take the Sig 310 for a run yesterday and it just wouldn't get out of the hole. We have twin 5L Mercruisers with Alpha drives and she usually get up and on the plane very quickly. It seemed lik… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
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I have a 2002 Mercury 225 EFI on a 23 Sport Pro-Line ...
I have a 2002 Mercury 225 EFI on a 23 Sport Pro-Line Center Console. It runs hot according to the temp guage at around 185 degrees when running around 4000 RPM. When idling it runs around 160 degrees.… read more
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Meet the Experts:

Dominick

Dominick

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

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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Jeff G.

Jeff G.

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Captain Dave

Captain Dave

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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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