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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
22,043 satisfied customers
Cobra 4.3, 1986, overheats when cruising, temperature gauge
Cobra 4.3, 1986, overheats when cruising, temperature gauge does not move at idle. New impeller installed. … read more
Jason
Jason
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Vocational, Technical or Trade School
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Are all 1988 3.0L Mercruiser 4 cylinder engines LH? Water
Are all 1988 3.0L Mercruiser 4 cylinder engines LH? … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Wanted to ask Tan about my overheating issue. 1986
Wanted to ask Tan about my overheating issue. 1986 Mercruiser 3.0 I/O … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
My mercruiser engine raw water cooled the port riser very
hi my mercruiser engine raw water cooled the port riser very hot to touch engine temp normal… read more
Jason
Jason
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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
Ive got a Mercruiser 350 Mag in my 2000 Tige wake-board boat.
I've got a Mercruiser 350 Mag in my 2000 Tige wake-board boat. We had a major service in early June 2012 (fluids, plugs, impeller, etc.) It ran great on our next trip out two weeks later. Then in earl… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a mercruiser 3.0 liter 1992 motor in my Bayliner. The
I have a mercruiser 3.0 liter 1992 motor in my Bayliner. The motor has 400 hours on it and is used 75% in salt water. After every use I flush the motor with fresh water and a product called salt away.… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have a Rinker 232 with a mecruiser 5.0l alpha one engine
I have a Rinker 232 with a mecruiser 5.0l alpha one engine with steam coming from the exhaust. Cleaned both risers and replaced the thermostat but still have the same problem. Starboard riser is also … read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,715 satisfied customers
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer I noticed it was running hotter than what I remembered....~190-200. I checked the impeller and it looked OK. I replaced the thermostat … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
hi, i recently purchased a 2003 rinker 232 with a 5. merc alpha
hi, i recently purchased a 2003 rinker 232 with a 5. merc alpha one. The boat was out of the water for a season and i just put it in 2 mos ago. Unknown service history. Boat runs bullet proof for a 3 … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 1988 Mastercraft with 351 that will rise in temperature
I have a 1988 Mastercraft with 351 that will rise in temperature to 190-200 in about 10 minutes of operation. If I slow down and idle, it cools back to 160 and stay there. I have replaced raw water pu… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
What could cause water in #4 cylinder on Mercruiser 140/GM
What could cause water in #4 cylinder on Mercruiser 140/GM 3lt. Removed head and gasket lookks OK no cracks that I could see. Did not remove the manifold… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I might be buying a boat that has a I/O mercruiser 140 in it.The
I might be buying a boat that has a I/O mercruiser 140 in it.The looks to be in great condition with only 60hrs on the rebuild.The owner says thats it overheats after having it running for about 30 mi… read more
Jason
Jason
Associate Degree
210 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 1976 140 hp mercruiser. It all started the spring,
I have a 1976 140 hp mercruiser. It all started the spring, I took the boat out for a test run and it started missing bad. I pulled the plugs and NO.4 was wet with water. I pulled the head and it was … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
I have a Mercruiser Alpha One 140 hp installed in my 1986 Stingray
I have a Mercruiser Alpha One 140 hp installed in my 1986 Stingray bowrider. The engine and stern drive are the originals. The problem is that water is getting into the engine oil ... the engine oil l… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
Have a 86 mercruiser 3.0 140 with a cracked head, due to the
Have a 86 mercruiser 3.0 140 with a cracked head, due to the impeller in the outdrive going bad as well as my temperature gauge not alerting me that it was running hot. My head casting #2778954, and w… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
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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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