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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
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2014 Mercruiser 5.7 fresh water cooled. It
I have a 2014 Mercruiser 5.7 fresh water cooled. It overheated yesterday. I put a gallon of coolant in tonight and ran it. It stayed at 160-170 at dock idling for 15 minutes. I took it for a ride and … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 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
22,043 satisfied customers
Background. mercruiser 6.2 mpi 377 . bravo 3, ser 0w004265,
background. mercruiser 6.2 mpi 377 cid. bravo 3, ser 0w004265, '04. has factory installed thru hull pick up added to T fitting between the drive intake and the pump..so the bad news is skimmed across … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 8.1 Merc with 40 hrs on it. Boat over heat alarm started
I have a 8.1 Merc with 40 hrs on it. Boat over heat alarm started coming on after about 15 mins and only at higher RPM's. Mech changed water pump and impeller, Still doing the same thing, mech has giv… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a Volvo penta 3.0 glma motor and water comes out the
I have a Volvo penta 3.0 glma motor and water comes out the water intake instead of tack it in… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
just shipped my boat over land with 8.1s (Cruisers 3870).
just shipped my boat over land with 8.1s (Cruisers 3870). Running fine before shipping but now the port engine will not run water through it. Could there be an air bubble in it? thanks, Eric… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 454 bravo. The engine overheated,it would not draw
I have a 454 bravo. The engine overheated,it would not draw water from the leg. I disconnected the hose going to the leg and put a garden hose directly into the hose going to the pump.Engine still ove… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Hello, I have a 4.3 litre V6 MPI mercruiser with Alpha outdrive.
Hello, I have a 4.3 litre V6 MPI mercruiser with Alpha outdrive. Have problems with marine groth in the seawater inlet system through the outdrive and therefore want to convert to direct seawater inle… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,681 satisfied customers
I have a overheating problem in a 5.7 volvo penta 1999 .we
I have a overheating problem in a 5.7 volvo penta 1999 .we have changed water pump ,impeller,cleaned risers , flused block ,changed thermostat,removed thermostat,flushed block,swapped outdrives ,used … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Im trying to run anti-freeze thru my 1997 454 mercruiser.
I'm trying to run anti-freeze thru my 1997 454 mercruiser. I've drained the seawater from the engine. When I start up the seawater pump will not draw the anti-freeze thru. I'm using a bucket and hose … read more
hokuspokus614
hokuspokus614
Owner/Technician
Vocational, Technical or Trade Scho
6 satisfied customers
My lower unit on my mercruiser bravo one does not have
I need help!!! My lower unit on my mercruiser bravo one does not have intake and I replaced impeller on top already is there another one in the lower unit… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I am installing an auxiliary heater in my 1988 Searay 30D
I am installing an auxiliary heater in my 1988 Searay 30D with 5.7 Mercruiser inboards with shaft drives. It states in the manual to only connect auxiliary heaters by connecting the heater hose to the… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
My 3-year-old, well-maintained Yanmar 3YM20 seems not to be
My 3-year-old, well-maintained Yanmar 3YM20 seems not to be pulling seawater into the engine for cooling, as no seawater is exiting with the exhaust, and the motor overheats within 10 minutes or so. I… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Bravo I out drive on a 7.4 /454 gm. New to me boat. We
Bravo I out drive on a 7.4 /454 gm. New to me boat. We water hosed the unit before going to the lake and everything worked , water out the exhaust etc. When we put it in the lake after running a littl… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 1988 wellcraft with a 3.7 litre freshwater cooled
I have a 1988 wellcraft with a 3.7 litre freshwater cooled mercruiser engine with a heat exchanger. Presently I'm having a problem with high temps (220+ degrees) at medium to high rpms. The seawater g… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
2007 Formula, 496 with fresh water cooling has low water pump
2007 Formula, 496 with fresh water cooling has low water pump pressure. 60 hrs.total engine time, replaced impeller, transom grommet OK. Brass housing looks to have heated up but no scoring or burn ma… read more
K. Kergan
K. Kergan
Inboard/Outboard 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
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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

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Dominick

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Jason

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Tan

Tan

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Jeff G.

Jeff G.

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Captain Dave

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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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