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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 Scho
18,660 satisfied customers
Over heating issue. changed impeller, was in complete pieces
over heating issue. changed impeller, was in complete pieces .back flushed from oil cooler to pump. changed thermostat. found clog in fitting beneath both starboard and port exhaust risers. flushed fr… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,660 satisfied customers
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
Marine Mechanic
Vocational, Technical or Trade Scho
18,660 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
11,264 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
11,264 satisfied customers
I am considering the purchase or a 90 Sea Ray 42 Cruiser
I am considering the purchase or a '90 Sea Ray 42' Cruiser with two MerCruiser Model 7.4L with 1032 hours on them. How many additional hours do I have before a major overhaul? Thank you, John XXXXX XX… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 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
I have restored a 1974 Chris Craft XK-19 boat. Fresh water
I have restored a 1974 Chris Craft XK-19 boat. Fresh water use only - no salt water use. It now has a 2007 Chevy 350 replacement crate motor. It uses the log style, wet marine manifolds with "hump ris… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,545 satisfied customers
I have recently purchased a used 2004 Crownline 225BR sporting
I have recently purchased a used 2004 Crownline 225BR sporting a 5.7L GXI 350 Mag Volvo Penta and Volvo Penta Duo Prop outdrive. Only to find out later that it was once a salt water vessel. Before eve… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a 1979 mercruiser with 350 chev engine having over heating
I have a 1979 mercruiser with 350 chev engine having over heating problems. How much water should come out of the house right after the stern drive hooked up to garden hose? Trying to trouble shoot pr… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 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
11,264 satisfied customers
i have an1997 prostar 205. I have aproblem with the water temp
i have an1997 prostar 205. I have aproblem with the water temp going up I have checked the impeller and the transmission cooler scren both are clear. I ran my boat today at low speed for a few minutes… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
what is the average lifespan of a mercruiser 4.3L V6 motor,
what is the average lifespan of a mercruiser 4.3L V6 motor, it runs around a consistant 3600-4800RPM for about 30-45 minuts at a time befor resting. It has had oil changed every 15hours of run or at l… read more
Jason
Jason
Associate Degree
210 satisfied customers
I have an over heating problem in the starboard bravo 2 mercruiser;
I have an over heating problem in the starboard bravo 2 mercruiser; oil pressure is good and there appears to be adequate coolant. Is the water intake clogged and if so where do you repair it from… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 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
Marine Mechanic
Master's Degree
2,672 satisfied customers
I have a 5.7 fuel injected I believe about 270 HP factory installed
I have a 5.7 fuel injected I believe about 270 HP factory installed original in a 2000 WA250 Sportcraft engine is running about 190-200 degrees usually stays about 170 this has been a gradual increase… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
Hi guys. I have a 2001 Baja 302 with 454 efis Never noticed
Hi guys. I have a 2001 Baja 302 with 454 efi's Never noticed before but both stb. exhaust risers are much hoter than port side when running. Boat has 75 hours on it and has always been fresh water flu… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
Over heating problem. 5.7 mercruiser I/O, 1989, open system,
Over heating problem. 5.7 mercruiser I/O, 1989, open system, impeller was replaced 18 months ago, boat has been run at least monthly, I have checked power steering heat exchanger and it was clear. I a… read more
davesoutboard
davesoutboard
owner
Associate Degree
1,570 satisfied customers
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

704 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

18,660 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,264 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,729 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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