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Overheating only when boat on plane. 1988 3.7 mercruiser 470
1988 3.7 mercruiser 470 overheating only when on plane. Cool back down when slows down. Can troll all day long run half throttle and stays cool … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,123 satisfied customers
I have a 6.2 mercruiser. during flush out it wasnt pumping
i have a 6.2 mercruiser. during flush out it wasnt pumping water. changed impeller of raw water pump ,old one did not look bad. on start up ,no water from outdrive , idled up and water flow normal.idl… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,123 satisfied customers
I have a 3.0l volvo penta motor that is seized due to an
I have a 3.0l volvo penta motor that is seized due to an impeller failure … read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
3,038 satisfied customers
I took out my boat and when I speed up it cut off and my
I took out my boat and when I speed up it cut off and my temp gage was up … read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
3,038 satisfied customers
Have a re built 5.7 Mercruiser that over heats after 3000
Have a re built 5.7 Mercruiser that over heats after 3000 rpm. risers look clear new outdrive. last time had it out left side felt hotter then right … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,123 satisfied customers
We have a 2670 Bayliner Explorer with a 125AQ Volvo Penta
We have a 2670 Bayliner Explorer with a 125AQ Volvo Penta coupled to a 270 outdrive. Built in 1981. Boat long distances in Prince William Sound. Last tune up was about 200 hours ago. I did not properl… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,123 satisfied customers
Hi, just bought a 2004 Chaparral 220 SSI with a 5.7 Volvo Penta
Hi, just bought a 2004 Chaparral 220 SSI with a 5.7 Volvo Penta engine which runs great up to about 3,200 RPM's but overheats when it gets above 4,000 RPM's. The boat yard has replaced the impeller, 1… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 2000 Volvo Penta 5.7GSi that I just changed the manifolds
I have a 2000 Volvo Penta 5.7GSi that I just changed the manifolds and risers in. I also installed new plugs, changed the oil, new impeller and replaced the hoses running from the manifolds running to… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
24,123 satisfied customers
I have a 7.4 litre mercruiser with a bravo 1 outdrive. Last
I have a 7.4 litre mercruiser with a bravo 1 outdrive. Last weekend I took the boat out and it began to overheat while in neutral. When I ran the boat a little bit the temp guage dropped down to about… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have an older (1976) mercruiser 233 (351) that when connected
I have an older (1976) mercruiser 233 (351) that when connected to a garden hose it cools off fine and water is running through the entire system. I put the boat in the lake but it seems like no water… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
1986 Mercruiser 140 HP in line 4. Engine #A586058 Model#2140W Overheating
1986 Mercruiser 140 HP in line 4. Engine #A586058 Model#2140W Overheating? Have replaced thermostat and still overheats. Have run without thermostat and still overheats. My thinking is either the wate… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 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 just bougth a boat with the mercruiser 470,year 1985 .He
I just bougth a boat with the mercruiser 470,year 1985 .He started the engine to show me that the engine was fine , is it posible that the water pump impeller got damaged ?… read more
shane j forrest
shane j forrest
Vocational, Technical or Trade Scho
270 satisfied customers
Recently purchased 96 Four Winns Sundowner 225 w/Volvo Penta
Recently purchased '96 Four Winns Sundowner 225 w/Volvo Penta 5.8efi and FWC and a Cobra outdrive. When I attempt to flush the outdrive most of the water sprays on the outside of the outdrive and very… read more
Master Tech
Master Tech
Marine Technician
Vocational, Technical or Trade Scho
1,168 satisfied customers
i have a 5.7 l mercruiser inboard that is overheating at trolling
i have a 5.7 l mercruiser inboard that is overheating at trolling speed only. changed the impeller and it's still happening. runs cool at higher rpms in fact if it starts to climb when trolling 2.5 mp… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
Have a 86 mercruiser 3.0 140 with a cracked head, due to the
Have a 86 mercruiser 3.0 140 with a cracked head, due to the impeller in the outdrive going bad as well as my temperature gauge not alerting me that it was running hot. My head casting #2778954, and w… read more
Master Tech
Master Tech
Marine Technician
Vocational, Technical or Trade Scho
1,168 satisfied customers
I have a 1975 marktwain with a mercruiser 888. It was winterized
I have a 1975 marktwain with a mercruiser 888. It was winterized last year and the antifreeze was left in the block. It was stored in doors. Early in the spring the gimal bearing and shift cable was r… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
403 satisfied customers
I have a 79 Beachcraft with a 400 OMC outdrive. 2 Problems
I have a '79 Beachcraft with a 400 OMC outdrive. 2 Problems: Tilt Lift doesn't move up or down via the switch. Have to pull out the worm gear and move manually. (motor is good I pulled and checked it)… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Marine Mechanic

4,115 satisfied customers

40 years experience, Safe boating instruct., 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

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

Jason

Jason

Marine Mechanic

24,123 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

Noel Schembri

Noel Schembri

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Advanced technical diploma

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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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