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Overheating on 1997 Mercruiser 7.4L. THe exhaust tube on the
THe exhaust tube on the right side of the engine is getting hot. Left side runs at 103 degrees F, right side is 170 … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
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
22,804 satisfied customers
I have a 1977 mercruiser stern drive. it is over heating
I have a 1977 mercruiser stern drive. it is over heating after about 4or 5 minutes. I replaced the main water pump and the lower unit pump. It is still over heating I am try to follow the cooling syst… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a 2008 5.7Gi300J with 250 hours. Just recently the
I have a 2008 5.7Gi300J with 250 hours. Just recently the engine over heats slowly (10 minutes at idle) when in sea water. If I attach hose water it will idle indefinitely without overheat. Thermostat… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
i have twin Mercruiser 305 ci (MIE228) in a 1978 Bertram 28
i have twin Mercruiser 305 ci (MIE228) in a 1978 Bertram 28 the port engine has been overheating with the temp gauge showing rapid increase at higher rpm, then dropping when rpms are reduced and engin… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
working on a mercrusier 350 5.7, alpha one gen 2 thats runnig
working on a mercrusier 350 5.7, alpha one gen 2 that's runnig hot enough to set off the warning buzzer 200 degrees. changed raw waterpump in lower unit and new engine circulating pump. changed transo… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
3,332 satisfied customers
Hi. I have a 2003 Mercruiser 4.3 MPI alpha one Gen II. I recently
Hi. I have a 2003 Mercruiser 4.3 MPI alpha one Gen II. I recently performed the following maintenence: New exhaust bellows, driveshaft bellows, shift bellows, water hose, and impeller. On the test run… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I replaced my raw water pump impeller and now i have water
I replaced my raw water pump impeller and now i have water leaking from the plugs in both the exhaust mainfold just before the riser. More water is coming out of the starboard side then the port side … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a 2001 4.3L. It will start to over heat the faster
I have a 2001 4.3L. It will start to over heat the faster I go, but sometimes it will start to cool down going fast. I've replaced the impeller and the thermostat but it keeps running hot. I can't fig… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
5.7L raw water cooled. Starboard side riser running too hot
5.7L raw water cooled. Starboard side riser running too hot to touch. Changed the riser with a new one, no difference. Still running hot on the one side.… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
5.7L 350, OF601827,stern drive Alpha/gen. The impeller,both
5.7L 350, OF601827,stern drive Alpha/gen. The impeller,both manifolds & risers,thermostat,water pump have been replaced(new) this month. The engine still heats til the alarm goes off as the temp rises… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Gets water in all 8 cylinders only when its in the water. If
Gets water in all 8 cylinders only when its in the water. If you run it with a garden hose its fine. Its a 1979 Gm 305… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Hi,i have a 5.7 mercruiser and alpha one stern drive,i installed
Hi,i have a 5.7 mercruiser and alpha one stern drive,i installed a closed cooling system.But the engine starts overheating after a while when i speed up.If i install a raw water pump insted of using t… read more
K. Kergan
K. Kergan
Marine Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a over heating problem with a 260 hp Mercruiser chevy
I have a over heating problem with a 260 hp Mercruiser chevy thru the hull drive engine.It is overheating so I removed the thermostat,boats in Miami,still over heats and the cooling water is black and… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
i have a 1979 470 mercruiser inboard that heated up i found
i have a 1979 470 mercruiser inboard that heated up i found a broken hose on the leg and replaced it then hooked up mouse ears and garden hose and tested the engine thinking we solved the problem same… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
543 satisfied customers
my impeller has total disentegrated due to be run dry, how
my impeller has total disentegrated due to be run dry, how should I flush the system to make sure have all the pieces out? it is a mercruiser with a 350 engine, bravo three stern drive… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
Hi, I have a 1988 2.3l ford tko with cobra 400 I/O. Ive had
Hi, I have a 1988 2.3l ford tko with cobra 400 I/O. I've had this boat since new. Overheating problem within minutes of cold start up, does not matter whether it is idling or powered up. Here is a lis… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
I have a 1979 305 cu. in. small block chevy mercurymarine engine
I have a 1979 305 cu. in. small block chevy mercurymarine engine with direct seawater cooled manifolds. The engine runs fine when on the trailer with water earmuffs connented to the lower leg. The pro… 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:

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

22,804 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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