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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
17,310 satisfied customers
I have twin inboard mercruiser 5.7 inboard with closed
I have twin inboard mercruiser 5.7 inboard with closed cooling system...I am having a high speed overheating issue on both..high temp is within a couple of degrees on both of them..I am seeing air bub… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,491 satisfied customers
I just repowered my 28 bertram with two reman 5.7's these are
i just repowered my 28 bertram with two reman 5.7's these are the older block 010 gm's (pre vortec). i have new risers, manifolds, raw water pump, and all hoses are new. the boat is fresh water cooled… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,491 satisfied customers
I have a 2001 Mercruiser 7.4L MPI on a Bravo 3, Serial #
I have a 2001 Mercruiser 7.4L MPI on a Bravo 3, Serial # ***** My temp gauge goes up and down from 160 to 170. I'm planning on changing the sender and checking the wires on the sender and gauge but th… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Freshwater cooled mercruiser bravo 5.7 overheats under load
i have a freshwater cooled 1999 mercruiser bravo 5.7 that overheats under load (really quickly). It will not overheat on the mooring at fast idle. I have replaced the raw water pump, manifolds / riser… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,741 satisfied customers
I have a reinell 22 ft with a 188 mercruiser which sat for
I have a reinell 22 ft with a 188 mercruiser which sat for the past year, but the seller started right up prior to the sale. however when i put it in the water and attempted to run it,it overheated an… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,741 satisfied customers
On a 350 carbed mercrusier, both waterpumps just replaced,
On a 350 carbed mercrusier, both waterpumps just replaced, runs hot ,sets off alarm after 45 mins at idle 700 rpms. Boat is in water, cools down to 170 after running 2000 rpms for about 4-5 mins. Shou… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,491 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
11,491 satisfied customers
I have a 7.4 mercruiser fuel injected with a bravo 3 outdrive.
I have a 7.4 mercruiser fuel injected with a bravo 3 outdrive. It is raw water cooled with raw water pump below alternator. the engine would start to run hot when I went over 2500 rpm. I took thermost… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,491 satisfied customers
I have a 25 ft Davis Bahia with a 5.7 GI-EF model engine in
I have a 25 ft Davis Bahia with a 5.7 GI-EF model engine in it with a fresh water colsed loop cooling system. A couple of weeks ago the raw water impeller disintegrated on me just off the boat ramp. W… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 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 2005 5.7 black scorpion that just lunched a cooling
I have a 2005 5.7 black scorpion that just lunched a cooling water impeller. Changing the impeller was no problem but I'm worried about where some of the little bits of impeller ended up, should this … read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I HAVE A 1985 CHRIS CRAFT FRESH WATER COOLED MERCRUISER 230
I HAVE A 1985 CHRIS CRAFT FRESH WATER COOLED MERCRUISER 230 THAT GOES UP TO 190 DEGREES AT HIGH SPEEDS 2500 RPM OR HIGHER WHERE SHOULD I START LOOKING FOR THE CAUSE I KNOW IT SHULD BE RUNNING AT 160 D… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,491 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
1984 omc 3.8 liter fresh water cooled. Having overheating issues.
1984 omc 3.8 liter fresh water cooled. Having overheating issues. replaced lower unit pump (looked ok) and circulation pump (impeller a mess). Originally was able to run boat on a plane to keep engine… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
I have two inboard motors when they are in idle, the one motor
I have two inboard motors when they are in idle, the one motor is running at 145, the other is running at 175, I changed out the thermostates, what else could the problem be?… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 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
Went to take the Sig 310 for a run yesterday and it just wouldnt
Went to take the Sig 310 for a run yesterday and it just wouldn't get out of the hole. We have twin 5L Mercruisers with Alpha drives and she usually get up and on the plane very quickly. It seemed lik… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
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Dominick

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John White

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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Jeff G.

Jeff G.

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4,729 satisfied customers

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Captain Dave

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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