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Im back ...same problem ,boat over heating ....replaced
Hi...Im back ...same problem ,boat over heating ....replaced water impeller on raw water pump and its still over heating...can impeller be put in backwards and not work...we took off outlet line of wa… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
I have a Universal M-25XPB 3 cylinder diesel engine in my
I have a Universal M-25XPB 3 cylinder diesel engine in my catalina sail boat. I am losing fresh water out the exhaust. It is going over almost as fast as I can fill it with the dock side water hose. I… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
My Kohler 5e marine generator is overheating. At some point
My Kohler 5e marine generator is overheating. At some point in the past, the previous owner had let a number of impeller blades into the heat exchanger which was causing overheating. All debris has be… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
I have a 1999 mercruiser 7.4 block 454 horizon engine was
Hello I have a 1999 mercruiser 7.4 long block 454 horizon engine was just replaced 3 months ago. Was rebuilt. Took it out and ran it at 3000 rpm for about 45 min after two months boat was docked. Boat… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,739 satisfied customers
I'm working on an 8.1 Mercruiser new long block manifolds
Hello I'm working on an 8.1 Mercruiser new long block manifolds and impeller I'm running on hose with plunger to through hole. (Works fine for port engine) I have good flow all the way to the manifold… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 1987 sea ray with twin 5.7's that I just bought.
Hello, I have a 1987 sea ray with twin 5.7's that I just bought. The port engine is overheating at idle speeds and it's losing fluid. Ive seen it boil out of the cap, also boiling into the overflow an… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
got a 2005 498 mag mercruser 92 hrs on engine. After 3 min
got a 2005 498 mag mercruser 92 hrs on engine. After 3 min run time constant alarm comes on, got oil and coolant?… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,507 satisfied customers
i bought a 1978 penn yan sportfisher 26 with twin crusaders
i bought a 1978 penn yan sportfisher 26' with twin crusaders and enclosed cooling system. i have not had time to play with it yet and dont know much about this setup. is is safe to crank the engines w… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 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
hello, i have a 86 bayliner 131 ,have a overheating problem.
hello, i have a 86 bayliner 131 ,have a overheating problem. changed the impeller, thermosts good, while heat exchanger was low on coolent, looked clean from the hole on top. or do i have to take the … read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,396 satisfied customers
My 3GM30F is loosing water from the heat exchangerz I have
My 3GM30F is loosing water from the heat exchangerz I have checked impellers, fresh water intake oil sump to no avail. HELP !!!!! drains are closed.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
hi there, 1997 38 carver sant. runs hot like 210 degrees and
hi there, 1997 38 carver sant. runs hot like 210 degrees and every part has been changed.454s 650 hours and i am afraid to go far because it will overheat.… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 04 reinell with the 496 volvo penta closed cooling
I have a 04 reinell with the 496 volvo penta closed cooling system. I have replaced the lower unit oil, stabilized the fuel, and drained the exhaust manifolds. Do I need to worry about water in the wa… read more
Rick Gay
Rick Gay
High School or GED
106 satisfied customers
I have a pair of Yanmar 6LY2a-STPs in a Formula 2005 40 PC
I have a pair of Yanmar 6LY2a-STP's in a Formula 2005 40 PC on an inland lake in Kentucky. The boat stays in the water all year. This past weekend I changed oil and winterized engines (I hope!). To dr… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
2,059 satisfied customers
Winterizing my hunter 336 with 3gm30f Yanmar engine. The antifreeze
Winterizing my hunter 336 with 3gm30f Yanmar engine. The antifreeze has been changed in the system on board. I would like to get suggestions for how to best winterize the external water intake through… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
boat engine over heated , so replaced impeller at front of
boat engine over heated , so replaced impeller at front of engine , i launched the boat and the engine ran hot again , what could be the problem . larry… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
Volvo 5.0GXI, 270 Horsepower Starboard side engine in a ...
Volvo 5.0GXI, 270 Horsepower Starboard side engine in a 27'' Formula PC, with Volvo DP-1.95 Outdrives, Starboard side engine overheats. Already replaced thermostat and inpeller (sp). Still overheating… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
2,059 satisfied customers
I have a Mercruiser 485. Coolant is escaping from the ...
I have a Mercruiser 485. Coolant is escaping from the coolant reservoir. Lost antifreeze thru winter as drain cocks were open, some coolant observed in hull. Filled reservoir, ran boat in water for ab… read more
Larry B.
Larry B.
Marine Service Tech
High School or GED
574 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

2,678 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

22,043 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,507 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

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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