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I am seeking help with a cooling problem with 2007
I am seeking help with a cooling problem with 2007 Mercruiser 350 MAG MPI with a Bravo III drive. Need an experienced mechanic with experience on this specific engine. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
If possible I need the exhaust system schematics for aTropez
If possible I need the exhaust system schematics for a*****Tropez with twin 454's. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
My MerCruiser 350 mag is only overheating under heavy load.
My MerCruiser 350 mag is only overheating under heavy load. Under 2500 RPM are so it will maintain 160 to 170 about 3000 4000 RPM the temperature rises to 200… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
Mercruiser Mag 350 overheating. Have replaced raw water
Mercruiser Mag 350 overheating. Have replaced raw water pump. Thermastat looks "charred" with build up that looks like carbon on a spark plug. Ran w/thermastat completely removed. Still overheating. A… read more
Jason
Jason
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Vocational, Technical or Trade School
19,150 satisfied customers
Have a 1981 260 Mercruiser with an overheating issue, has a
Have a 1981 260 Mercruiser with an overheating issue, has a new water pump, exhaust manifolds, new risers, new thermostat housing and and thermostat. Still overheats.Engine runs excellent!… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
I have the same problem with my boat,how was this resolved, I changed manifolds,risers, el
I have the same problem with my boat,how was this resolved, I changed manifolds,risers, elbows,sea water pump, sensors thermostat still gets hot engine has only 98hrs… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
I have a 2000 Mercruiser 7.4L MPI engine on a Bravo 3,
I have a 2000 Mercruiser 7.4L MPI engine on a Bravo 3, serial # ***** I hit the risers with a IR temp gun during the first cruise. At 1000 RPMs, both are 85 degrees. at 3600 RPMs, the port riser is 90… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
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, Im having ongoing issues with my mercruiser 5.7 MPI
Hello, Im having ongoing issues with my mercruiser 5.7 MPI Horizon motor overheating. I have tried many things including manifolds, elbows, raw water pump etc... It is a half closed cooling systems. I… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
I have an an 88 wellcraft with an 3.0 mercruiser I/0 apha one
I have an an 88 wellcraft with an 3.0 mercruiser I/0 apha one gen 1 and believe I have a small blockage from the manifold riser down to exit port.. what is the best way to flush it out and how? it may… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
i have an old mercruiser 228 i am in oklahoma previous owner
i have an old mercruiser 228 i am in oklahoma previous owner let it freeze the exhaust manifolds froze and have the cracks welded is it possible this is causing overheating at low idle… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
i have a 1976 mercruiser 250 (350) gm engine. Boat has sat
i have a 1976 mercruiser 250 (350) gm engine. Boat has sat for eight years . I rebuilt engine complete (30 year heavy equip mechanic) My yard installed the engine and outdrive New water pupm twice in … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
I have a over heating problem on my 350 mpi merc br 3. I have
I have a over heating problem on my 350 mpi merc br 3. I have changed the raw water pump and risers and the thermostat. This is not in the water. It is on mufs. had the problem last year and changed i… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
I am having to replace the engine in my boat due to an overheat
I am having to replace the engine in my boat due to an overheat issue. I am ordering a reman mercruiser mag 350 mpi longblock and am going to be swapping out the remaining components from my existing … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
i have a 1999 7.4 mpi horizon v drive. this engine is fresh
i have a 1999 7.4 mpi horizon v drive. this engine is fresh water cooled. after engine warms up the raw water side starves for water as if there is a blockage or raw water pump problem. it pumps enoug… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
I have a 1990 Donzi with a OMC 5.7L Cobra. Two problems, first,
I have a 1990 Donzi with a OMC 5.7L Cobra. Two problems, first, an exhaust smell in the cockpit when running ( this is new) but I do not hear or see any leaks in the engine compartment. Secondly, moto… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
8.1 liter mercruiser engine keeps overheating. i have check
8.1 liter mercruiser engine keeps overheating. i have check changed evryting that i woud thing would cause it… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,150 satisfied customers
1999 7.4 mag 454 / with bravo 3 rand gr8 last two years but
1999 7.4 mag 454 / with bravo 3 rand gr8 last two years but after winter this year over heating @hi rpm or on plane no prob till over 2 rpm. replaced water pump, theristat, inpeller, checked all hses … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
I have an older (1976) mercruiser 233 (351) which I purchased
I have an older (1976) mercruiser 233 (351) which I purchased with a serious overheating problem. I have replaced the outdrive impeller with a kit and checked most of the cooling system for blockages … read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

Ted G.

Ted G.

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

John White

John White

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

Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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

Jeff G.

Jeff G.

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4,730 satisfied customers

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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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