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Prospective purchase. 5.7 mercruiser 350 mag mpi. risers at
prospective purchase. 5.7 mercruiser 350 mag mpi. risers at 100 degrees, manifolds at 189 or so, both temps via handheld IR temp reader. Temp at guage at helm stays around 175. This was after bringing… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
3,332 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
Marine Mechanic
Vocational, Technical or Trade School
23,724 satisfied customers
2004 Mercruiser 5.0 MPI V8 Bravo 3 is overheating. History:
2004 Mercruiser 5.0 MPI V8 Bravo 3 is overheating. History: It was a salt water boat that was drystacked in SC. Boat is a 2004 Sea Ray Sundeck 260. Engine serial number 668946 it has dry joints and a … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,724 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
23,724 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
We have a mercruiser 350 magnum and it is overheating above
We have a mercruiser 350 magnum and it is overheating above 3000revs. It has just been serviced and a new water pump, manifold and risers have been installed… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,724 satisfied customers
Mercruiser 4.3LX V6 with Alpha Gen 2 drives. Thunderbolt Ignition.
Mercruiser 4.3LX V6 with Alpha Gen 2 drives. Thunderbolt Ignition. Standard carburetor. Problem: Starboard Engine High Speed Overheating At idle and speeds up to 2000 rpm, temp is ok. After getting up… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I am looking to purchase a 1987,32 Bayliner w/twin 260hp Volvo
I am looking to purchase a 1987,32' Bayliner w/twin 260hp Volvo gas fresh water cooled marine engines. Are there any recorded common problems with these engines I need to be aware of? The "transmissio… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
454 mercruiser engine. What could cause white smoke, other
454 mercruiser engine. What could cause white smoke, other than a bad head gasket. I did a valve job on a friends boat. Sent heads out to machine shop. After completion engines ran fine. Several month… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,724 satisfied customers
I have an older Sea Ray w/188 hp 888 (302) Mercruiser i/o,
I have an older Sea Ray w/188 hp 888 (302) Mercruiser i/o, started overheating the same day I lost my gears in LU. I have replaced the LU, new water pump, impeller, new BLOCK water pump. Getting low w… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,724 satisfied customers
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
Marine Mechanic
Vocational, Technical or Trade School
23,724 satisfied customers
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
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I just recieved two rebuilt engines, one works great and the
I just recieved two rebuilt engines, one works great and the other over heats. The oil in the port engine has less than one hour useage. New oil and filter put in a few weeks ago. I was told that the … read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar ), installed new 160 degree thermostat. Engines starts fine, temp goes to 180 and stays there. Can cruise for hours below approx. 2500 r… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 1997 Mariah Shabah Z210 w/ a 454 Mercruiser bravo
I have a 1997 Mariah Shabah Z210 w/ a 454 Mercruiser bravo one drive. I have replaced the impellar and the thermostat but it still seems to over heat is the something else tha could be causing this?… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I had a 2003 350 mag mpi installed in a 32 ft aluminum boat
I had a 2003 350 mag mpi installed in a 32 ft aluminum boat with a keel cooler. The place I had install it said the motor was made to run raw water through it but would be no problem hooking it to the… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
Hi. On a 2006 Mercruiser MPI 350 Engine (300 hp) which is
Hi. On a 2006 Mercruiser MPI 350 Engine (300 hp) which is sea water cooled, with a Bravo III outdrive, where is the sea water intake for the coolins system. The boat was grounded in mud last night and… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
Hi - I have cooling problems on my 7.4 liter raw water cooled
Hi - I have cooling problems on my 7.4 liter raw water cooled mercruiser bravo III's. The port runs hot although i just changed the waterpump and thermostat. i pulled the risers and they look very cle… read more
Dr. Joe
Dr. Joe
Bachelor's Degree
198 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

3,332 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

23,724 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

Noel Schembri

Noel Schembri

Marine Mechanic

2,759 satisfied customers

Advanced technical diploma

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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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