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Checking on a 2017 Mercruiser 8.2 Horizon. Trying to
Checking on a 2017 Mercruiser 8.2 Horizon. Trying to understand how the closed cooling system works and if in fact it is closed cooling. Saw a mechanic in my boat yard taking apart manifolds and riser… read more
Ted G.
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Vocational, Technical or Trade Scho
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Ted G.
Ted G.
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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
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Jeff G.
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I have a engine overheating problem.Mercruiser 2000 model 5.7
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volvo penta 4.3L 1996 new motor installed in 1984 bayliner
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Tan
Tan
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I have a 06 mercruiser/alpha with a closed cooled system went
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James
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I have the 496 Merc Bravo II with 300 hrs. Last outing I got
I have the 496 Merc Bravo II with 300 hrs. Last outing I got an alarm and noticed the antifreeze level low. I added antifreeze and later noticed it was low again. I can not find any leaks in the engin… read more
Jason
Jason
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Hi, When I winterized the engine, I observer that the cooling
Hi, When I winterized the engine, I observer that the cooling fluid/antifreeze was heavily contaminated. The antifreeze is greenblack with a lot of small black particles, and it is non transparent. Th… read more
Captain Dave
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I have a 1987 Jasper rebuilt 165 4-cyl fresh water cooled engine.
I have a 1987 Jasper rebuilt 165 4-cyl fresh water cooled engine. There is plenty of water flow in the salt eater system (lower unit). The problem is in the engine. When the boat is started the tempat… read more
Tan
Tan
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I have a 1983 bayliner with the AQ125 engine, it will run hot.
I have a 1983 bayliner with the AQ125 engine, it will run hot. I have changed the sea water pump impeller, the thermostat, flushed out the heat exchanger (did not notice any dirty fluid when I did thi… read more
Tan
Tan
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I have a kohler marine genset 5E. Changed impeller flushed
I have a kohler marine genset 5E. Changed impeller flushed all lines including heat exchanger. Now it runs 5 mins then shut off and the heat exchanger is somewhat cool but the closed system is very ho… read more
Tan
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I have a 2000 mercruiser 350 mpi engine with the mercury closed
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I have just had a new SX-A outdrive installed on my boat, which
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We have a 1987 Regal with twin Merc 470s. One motor runs extremely
We have a 1987 Regal with twin Merc 470's. One motor runs extremely hot when under power then when placing in nuetral and run at approx 2000 rpm cools right down - We had had the impellor replaced, th… read more
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I have an 04 Polaris MX150. Need to change the antifreeze this
I have an 04 Polaris MX150. Need to change the antifreeze this fall. What is the best method for this?… read more
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1985 4/cylinder mercruiser 470 with a closed loop cooling system
1985 4/cylinder mercruiser 470 with a closed loop cooling system heat exchanger. Their is Lake water in the crankcase. The internal cooling section is not contaminated or loosing antifreese. Could it … read more
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How do I know if I have a bad manafold Over the winter the
How do I know if I have a bad manafold? Over the winter the antifreeze seems to have disapeared from the exchanger and when I start the motor now for the first thirty secods or so, there seems to be a… read more
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

1,865 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

20,078 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

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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