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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
11,504 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
11,504 satisfied customers
I have a 1989 bayliner 2455 ciera sunbridge with the 5.8 motor,
I have a 1989 bayliner 2455 ciera sunbridge with the 5.8 motor, just put new exhaust manifolds on and first time out motor got hot about 220 deg motor then had a slight knock ,oil pressure dropped. sh… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 1978 Egg Harbor sport fish with twin 270 HP Crusader
I have a 1978 Egg Harbor sport fish with twin 270 HP Crusader gas engines (350 GM blocks) - raw-cooled. The starboard engine has never been touched and has around 2200 hours. Over the past couple of s… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
I have a 7.4 L , closed cooling, inboard. The motor was running
I have a 7.4 L , closed cooling, inboard. The motor was running around 160 to 180. Replaced the raw water pump but it did nothing. Old one was in good shape. Pulled out the thermostat, that got me hom… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
i have a yanmar 6lpa-stp-stzp . it keeps blowing hoses they
i have a yanmar 6lpa-stp-stzp . it keeps blowing hoses they tell me it has a restriction, but where is the restriction?… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
i have a volvo penta 3.0 gs marine engine that is building
i have a volvo penta 3.0 gs marine engine that is building alot of water pressure through out the cooling system has blown a ciculator pump hose . motor keeps a good temp at 150 degrees and thermostat… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a over heating problem on my 350 mpi merc br 3. I have
I have a over heating problem on my 350 mpi merc br 3. I have changed the raw water pump and risers and the thermostat. This is not in the water. It is on mufs. had the problem last year and changed i… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a Yanmar 3GM30F in my 33 sailboat. While motoring at
I have a Yanmar 3GM30F in my 33' sailboat. While motoring at 3400rpm for 45 mins. it overheated. I checked the impeller and strainer and all was OK. I restarted and cruised for another 2hrs at 2400rpm… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 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
Vocational, Technical or Trade School
18,955 satisfied customers
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer
I have a 1981 Starts and Stripes with a 351 Windsor. Last summer I noticed it was running hotter than what I remembered....~190-200. I checked the impeller and it looked OK. I replaced the thermostat … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
1988 big block 454, 34 searay, idle it runs fine 140-145,
1988 big block 454, 34 searay, idle it runs fine 140-145, good water flow out both exhausts,any power the temp max spike right away 202+ I have to shut it down right away. New impeller, new thermostat… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 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 1989 mastercraft tristar boat. The boat is running
I have a 1989 mastercraft tristar boat. The boat is running hot, 200-220 F. I take the thermostat out and it runs cool 130 F. I put in two different 143 F thermostats and no change. I did a water flow… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
I have a mercruiser 5.7L engine. aside from the choke unit,
I have a mercruiser 5.7L engine. aside from the choke unit, is the intake manifold the same as an automotive? I searching for a running hot situation, with all raw water components being new. (manifol… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
what is the normal operating temperature for exhaust manifolds
what is the normal operating temperature for exhaust manifolds for a 1995 mercruiser 5.0lx… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a over heating problem with a 260 hp Mercruiser chevy
I have a over heating problem with a 260 hp Mercruiser chevy thru the hull drive engine.It is overheating so I removed the thermostat,boats in Miami,still over heats and the cooling water is black and… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 1973 chris craft express, 25 ft. I replaced the 307
I have a 1973 chris craft express, 25 ft. I replaced the 307 with a 350 automotive engine. It is sea water cooled. the problem i have is the engine doesn't seem to be circulating water. Have osco exha… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

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40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

Dominick

Dominick

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25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

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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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40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

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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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