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I have a 1997 mercruiser 350 chevy. We built a new engine
Hi, I have a 1997 mercruiser 350 chevy. We built a new engine and upon start up, we are experiencing temperature fluctuations from 150 degrees all the way up to 200 degrees. I've changed the water pump, thermostat, out drive impeller and confirmed that we have flow to the block and the problem still remains. Do you have any idea what else could cause the temp control issue? … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,771 satisfied customers
I have twin 1998 5.7s, this season temp fluctuates between
I have twin 1998 5.7s, this season temp fluctuates between 120 and 150 on both, previous always stayed around 180, changed thermostat, sender, raw and circulating pumps, checked gauge, working properl… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,771 satisfied customers
I ahve a 2004 mercruiser 5.0 with dry joing exhaust bravo
I ahve a 2004 mercruiser 5.0 with dry joing exhaust bravo drive. the water pick up has been changed to through hull pick up new raw water pump,new circulator pump.manifolds were removed checked and ap… read more
Jason
Jason
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Vocational, Technical or Trade School
20,771 satisfied customers
Greetings... I have a 1996 Catalina Sailboat with a
Greetings... I have a 1996 Catalina Sailboat with a universal / Westerbeke engine (M3-20). Shortly after buying the boat, I was changing out the hoses and discovered that a thermostat was not installe… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,771 satisfied customers
If the cooling system is airbound because of a head gasket
If the cooling system is airbound because of a head gasket would you see milky oil or other signs? My block is running at 200 degrees when over 2500 rpm. I can run 2500 or under at 180. When it runs h… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
402 satisfied customers
I have a 3116 300 HP temperature at thermostat getting up to
I have a 3116 300 HP temperature at thermostat getting up to 220 replaced thermostat and still there took it out ran the engine and it is running at 110 at thermostat. Any suggestions we are at a lost… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
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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.
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Vocational, Technical or Trade Scho
4,730 satisfied customers
Our sailboat has a Universal 5411 engine which appears to have
Our sailboat has a Universal 5411 engine which appears to have been converted from raw to fresh water cooling. In the two seasons we've had it the temp gauge has never moved, and coolant hoses do not … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,771 satisfied customers
I have a 1985 Catalina 27 that is overheating.Impellor was
I have a 1985 Catalina 27 that is overheating.Impellor was recently replaced. I removed impellor cover and opened thru hull valve. Only a trickle of water came up. Should there have been more ? The bo… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have 2000 Mercruiser 454 Magnum. What is the normal operating
I have 2000 Mercruiser 454 Magnum. What is the normal operating temerature ? The last several years, it and other mercruiser engines, seemed to run around 180 degrees, At the end of the boating season… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
My boat mechanic that tuned my new used 2001 Chapparal with
My boat mechanic that tuned my new used 2001 Chapparal with a Volvo 4.3 GS engine said the engine does not heat up at all. The temperature gauge does not move and he tested the thermostat ( out of the… read more
Jason
Jason
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Vocational, Technical or Trade School
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My 1989 Catalina 36 has a Universal M-25XP engine which has
My 1989 Catalina 36 has a Universal M-25XP engine which has had ongoing overheating problems. Recently, while running the engine for 10 minutes at 2000 RPM in the slip (with a mechanic) we noticed coo… read more
Jason
Jason
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Vocational, Technical or Trade School
20,771 satisfied customers
My engine warms to 210 degrees gauge after 15 min of cruising
My engine warms to 210 degrees gauge after 15 min of cruising slightly above idle. Then when I accelerate to engine stalls (once it backfired) and the throttle is unresponsive until I go back to idle.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,771 satisfied customers
I have had problems with coolant loss for some time, which
I have had problems with coolant loss for some time, which was decreased by fitting new pressure caps to both engines. NB this boat has been converted to LPG so the coolant also runs through the LPG g… read more
Tan
Tan
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Certified Marine Technician
11,409 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
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Vocational, Technical or Trade Scho
1,009 satisfied customers
Hi I have a 350 mercruser engine that is running hot. At idle
Hi, I have a 350 Mercruser carburetor engine that runs hot at idle and hotter on way. At idle it runs at 145 degrees without a thermostat. On way - at the dock tied up 1200 RPMs the temperature rises … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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I have a 33 ft. Sea Ray powered by twin 7.4 Merc Horizons,
I have a 33 ft. Sea Ray powered by twin 7.4 Merc Horizons, 380 HP. Last year I replaced the heat exchanger on port engine. Recently I noticed some bubbling, more than normal compared to other, in the … read more
ROCKET
ROCKET
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Vocational, Technical or Trade Scho
426 satisfied customers
I have a md30a volvo diesel turbo. One overheats and ...
I have a md30a volvo diesel turbo. One overheats and the other runs cold. Replaced the impellers, cleaned the strainers, backflushed from the heat exchanger. I''ve noticed that the hot running engine,… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

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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

John White

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

Jason

Jason

Marine Mechanic

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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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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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