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Steve here. 2003 merc 5.0 injected. overheating iasue due to
Steve here. 2003 merc 5.0 injected. overheating iasue due to rrestricted flow. pickups r clear, new impeller. new manifolds risers amd blocks in 2014.… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 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
11,406 satisfied customers
I have a mercruiser 8.2l with bravo 3, and changed the impeller
I have a mercruiser 8.2l with bravo 3, and changed the impeller on the raw water flow. However ow I'm getting low water flow. Do I need to bleed the air valve… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I am working on a 2001 Mercruiser 5.7 litre 2bbl, thunderbolt
I am working on a 2001 Mercruiser 5.7 litre 2bbl, thunderbolt V ignition with a friend. The boat was purchased at auction. When purchased, he had the water pump impeller replaced. The engine runs at t… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 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
11,406 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
11,406 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
11,406 satisfied customers
I have an after-factory Chevrolet 454cc "big block" engine
I have an after-factory Chevrolet 454cc "big block" engine with a Merc. Alpha I sterndrive on a 22 ft Formula boat, which consistently runs hot after 10 to 15 minutes at full throttle. Could the engin… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 satisfied customers
I have a 1993 Merc 350 Magnum 5.7 L with Alpha 1 outdrive.
I have a 1993 Merc 350 Magnum 5.7 L with Alpha 1 outdrive. Engine overheats under heavy throttle (usually runs about 170 according to gauge), but not while keeping below 3000 rpm. Checked flow from ou… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 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
11,406 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
11,406 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
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
i am overheating. 2005 mercruiser 5.0l fuel inj (at 2800rpm).
i am overheating. 2005 mercruiser 5.0l fuel inj (at 2800rpm). new water pump impeller last year, changed themostat this week. always flushed engine of salt water. do you think i have plugged exhaust r… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 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 1998 Sea Pro with a Chevy 350 inboard/outboard with
I have a 1998 Sea Pro with a Chevy 350 inboard/outboard with alpha drive. The engine temp is good at idle, but runs hot when under load, like trying to get on plane. When you slow back down, the temp … read more
Rick Gay
Rick Gay
High School or GED
106 satisfied customers
I have an 1989 17 vip boat. It has a 2.3l engine with an omc
I have an 1989 17' vip boat. It has a 2.3l engine with an omc outdrive. I know there is a conversion to make it a mercrcruiser outdrive. What I need to know is which particular outdrive and conversion… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
mercruiser alpha 1 5litre v8 stern drive my problem is as soon
mercruiser alpha 1 5litre v8 stern drive my problem is as soon as boat goes up on the plane audio alarm comes on engine tmperature rises over 175 i have checked and cleared intake holes and even used … read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I have an 1989 alpha 1 outdrive with a 3.8 V 6 it was getting
I have an 1989 alpha 1 outdrive with a 3.8 V 6 it was getting hot but would cool down at idle 2 to 3 years ago I had the impeller replaced at a local marina and figured it was the same thing. I droppe… 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

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

Dominick

Dominick

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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

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

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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

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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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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