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I have a remanufactured late-80s/early-90s 260 hp 5.7L
Good morning, I have a remanufactured late-80s/early-90s 260 hp 5.7L MerCruiser MCM with raw water cooling & log-style exhaust manifolds & elbow risers. Currently have 160-degree thermostat but having… read more
Jason
Jason
Marine Mechanic
24,178 satisfied customers
Overheating on 1997 Mercruiser 7.4L. THe exhaust tube on the
THe exhaust tube on the right side of the engine is getting hot. Left side runs at 103 degrees F, right side is 170 … read more
Jason
Jason
Marine Mechanic
24,178 satisfied customers
I HAVE 89 MERCRUISER WITH BIG BLOCK, 3 YEARS AGO I CONVERTED
HELLO , I HAVE 89 MERCRUISER WITH BIG BLOCK, 3 YEARS AGO I CONVERTED IT TO ***** MANIFOLDS COOLANT RISERS FRESH WATER COOLED HAS BEEN COOLING PERFECTLY THE MANIFOLDS I HAD USED AT THE TIME WERE USED A… read more
CalebA820
CalebA820
Technician
Marine technology
22 satisfied customers
Have a 454 Crusader engine which is overheating a bit and
Have a 454 Crusader engine which is overheating a bit and blowing stream . When it reaches about 180 I drop rpm and stays around 160 . All liquid levels are fine . No milky oil . Checked impeller it's… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662.
engine SN: OW673430, mercruiser 5.0 MPI, drive serial num OW927662. use boat in saltwater, engine is open cooled system using seawater for cooling. Temp are running between 185 and 205 on gauge on boa… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 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
11,409 satisfied customers
mercruiser 3.0 took out of storage for winter engin was completly
mercruiser 3.0 took out of storage for winter engin was completly drained of water, changed fuel filter, put muffs on it, got side tracked started engin ran for about 2 min.then started to squeal, rea… read more
Jason
Jason
Marine Mechanic
24,178 satisfied customers
Hi there, New problem. Im running hot. in slip get up 145
Hi there, New problem. I'm running hot. in slip get up 145 fast. Driving goes to 170 and keeps creeping up to 180-190 so I shut it down. Then creeps up to 200 with engine off. Turn it on temp goes dow… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
One of my engines is overheating at a slow rate. The raw water
One of my engines is overheating at a slow rate. The raw water cooled engine temperature normally sits at 175 degrees, but has been increasing slowing (over past 8 months) to 200 degrees at present. R… read more
Jason
Jason
Marine Mechanic
24,178 satisfied customers
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar ), installed new 160 degree thermostat. Engines starts fine, temp goes to 180 and stays there. Can cruise for hours below approx. 2500 r… read more
Jeremy R.
Jeremy R.
5,362 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
11,409 satisfied customers
I have twin 3208s (375 hp) with about 1800 hrs. Port engine
I have twin 3208s (375 hp) with about 1800 hrs. Port engine has been running about 10 degrees hotter. Have changed impeller, circulating pump and cleaned heat exchanger none of which has made a differ… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a Crusader 454 330 hp overheating. Older engines. Replaced
I have a Crusader 454 330 hp overheating. Older engines. Replaced manifolds and risers 2 yrs ago. Also replaced U cooler, and water pump. Replaced zincs and ran acid through u cooler and heat exchange… read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
3,041 satisfied customers
I have 1986 454 Crusaders, the right engine steams a small
I have 1986 454 Crusaders, the right engine steams a small bit at idle. I have installed new raw water pump,new exhaust manifolds, new 4" risers, new exhaust elbows,new oil cooler and had the heat exc… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
installed fresh water cooling on my 350 mercruiser one manifold
installed fresh water cooling on my 350 mercruiser one manifold reading 145 degrees other 190 puzzeled have new thermostat housing new hoses new manifolds and risers… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
Hi - I have a 1993 volvo penta 230 engine that has been running
Hi - I have a 1993 volvo penta 230 engine that has been running hot. The cooling water guage has been showing 200 to 205 F. Used an infrared thermometer and the thermo housing was in the high 190s aft… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
Hi, It seems the freshwater coolant circle of one of the two
1980 Mercruiser 470 freshwater coolant cycle clogged. I bought the Sea Ray 260 a while ago and started today for the first time the engines. The left engine runs fine after correcting the ignition cab… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
I have a 2001 4.3L V6 Mercruiser with an Alpha outdrive. The
I have a 2001 4.3L V6 Mercruiser with an Alpha outdrive. The stock one piece exhaust elbows rusted out and water got into the engine so I pulled the motor out and rebuilt it. The heads were taken in a… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Marine Mechanic

4,135 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

Marine Mechanic

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

Jason

Jason

Marine Mechanic

24,178 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

Marine Mechanic

3,041 satisfied customers

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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