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Mid 80s mercruiser inboard 305 4 barrel. Raw water cooled,
Mid 80s mercruiser inboard 305 4 barrel. Raw water cooled, only fresh water for life of boat. Replaced manifolds Ans risers last year no problem. Replaced impeller sender and have tried with 2 known g… read more
DavidJ25
DavidJ25
Marine Mechanic Supervisor
Vocational, Technical or Trade School
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Thermostat housing SEEMS to be the only hot spot at 180
thermostat housing SEEMS to be the only hot spot at 180 degrees (which sets alarm off). Pulled and cleaned the housing new 160 t-stat cleared water hoses , temps at 2000 rpms on risers 80 port 95 star… read more
Ted G.
Ted G.
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I'm overheating and getting smoke from a 7.4 mercruiser. The
I'm overheating and getting white smoke from a 7.4 mercruiser … read more
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Jason
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I have a 1992 Sea Ray 27' Sundancer. 1992 Sea Ray 27'
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Jason
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I am seeking help with a cooling problem with 2007
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Jason
Jason
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I recently replaced my impeller and thermostat in my
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Jason
Jason
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22,804 satisfied customers
Recently had manifold and risers opened and checked.
Recently had manifold and risers opened and checked. Replaced with new gaskets. At that point the engine starting overheating at idle, 225+ add a little throttle 1000rpm, it would cool off below 160. … read more
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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
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I have a 2006 Crownline 202 with a volvo pent 5.0. It has
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Jason
Jason
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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
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hi i have a 4.3 v6 mercruiser and the risers are getting hot.
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Jason
Jason
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Vocational, Technical or Trade School
22,804 satisfied customers
We have a mercruiser 350 magnum and it is overheating above
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Jason
Jason
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I have a 23.6 eliminator with a 1997 mercursier 502 mpi, bravo
I have a 23'.6 eliminator with a 1997 mercursier 502 mpi, bravo 1 drive. new manifolds, salt water cooled. now steam is coming though the through hull exhaust and over heats at high rmp to where the a… read more
Noel Schembri
Noel Schembri
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Hello, I have a 4.3 litre V6 MPI mercruiser with Alpha outdrive.
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Noel Schembri
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Last week i dewinterized my boat and everything flushed out
Last week i dewinterized my boat and everything flushed out fine.. I replaced the thermostat and now it won't circulate at all...… read more
Jason
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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.
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I am about to replace the raw water manifolds on a year 2000
I am about to replace the raw water manifolds on a year 2000 2bbl mercruiser engine /bravo 1 combination equipped with the factory mercruiser freshwater cooling kit. Engine has seawater pump low starb… read more
John White
John White
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I have a 2004 Mercruiser 5.7L, 250hp Sterndrive, Bravo lll.
I have a 2004 Mercruiser 5.7L, 250hp Sterndrive, Bravo lll. I am replacing the exhaust gaskets below and above the 3" risers. Dry Joint The engine is raw water cooled. Serial No. for the engine is OM6… read more
mercmastertech
mercmastertech
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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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