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Port engine is heating up to 192, replaced manifolds,
Port engine is heating up to 192, replaced manifolds, thermostat and impeller, pumps plenty of water and risers are not hot to touch, thinking maybe a temp sensor? … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I am seeking help with a cooling problem with 2007
I am seeking help with a cooling problem with 2007 Mercruiser 350 MAG MPI with a Bravo III drive. Need an experienced mechanic with experience on this specific engine. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Recently had manifold and risers opened and checked.
Recently had manifold and risers opened and checked. Replaced with new gaskets. At that point the engine starting overheating at idle, 225+ add a little throttle 1000rpm, it would cool off below 160. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Mercruiser 5.0 possibly overheating. Have 2003 5.0
Have 2003 5.0 Mercruiser. Alarm sounded. Its either low drive lube or overheat. Lube level is correct. Changed water pump and thermostat. Alarm still sounded. Guage on dash shows approx. 180 degrees at idle. Temp gun shows approx. 160 degrees at thermostat housing. Nothing warmer than that except manifold shows 200 degrees. Removed one riser and seems fairly good shape … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have 2003 Sea Ray 240, with Mercruiser 496 Mag Bravo
Hello, I have 2003 Sea Ray 240, with Mercruiser 496 Mag Bravo 1, with the SmartCraft monitoring system. The boat has recently had a lot of regular maintenance done, including new water pump housing, i… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
402 satisfied customers
2007 mercruiser 5.0 MPI, just replaced raw water impeller,
2007 mercruiser 5.0 MPI, just replaced raw water impeller, thermostat, oil, plugs, drive lube and engine runs smooth but using an IR gun thermometer I get 90F on top of riser, 180-185 on lower sides o… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have an overheating issue. My 2005 5.0L MPI has overheated
I have an overheating issue. My 2005 5.0L MPI has overheated twice after launching. I have replaced the water pump and thermostat and find that at low RPM the port exhaust has smaller flow than starbo… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,665 satisfied customers
Hey Jason, I have twin bravo 3 drives with 496 mercs. My Starboard engine runs 30 degrees
Hey Jason, I have twin bravo 3 drives with 496 mercs. My Starboard engine runs 30 degrees hotter than port and the exhaust overheat alarm sounds above 3400 rpm and guardian kicks in. The temp gauge sh… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2001 Mercruiser 5.7 litre Thunderbolt V engine. The
I have a 2001 Mercruiser 5.7 litre Thunderbolt V engine. The engine ran hot a week ago. I replaced the outdrive water pump, both risers and manifolds, the thermostat, checked all the hoses for blockag… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I just purchased a 1989 searay with a 4.3 L 175 hp v6 with
I just purchased a 1989 searay with a 4.3 L 175 hp v6 with alpha drive and it temp says it is 220 degrees I replaced the water pump in the outdrive, the sending unit and the thermostat and it still sa… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
1,031 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
11,409 satisfied customers
I just replaced my risers and manifolds on vp 5.7 gxi 2003.
I just replaced my risers and manifolds on vp 5.7 gxi 2003. Now the engine alarm sounds after idling for 5 minutes. temp gun shows the risers are hot at 150 degrees. The manifold at 140. much hotter t… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,557 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 can run all day as long as i dont exceed 3500 rpm. Any time
I can run all day as long as i don't exceed 3500 rpm. Any time I do, the temp creeps up to 175, goes into alarm and the motor goes into protection mode. The temp then spikes to 205. Used a temp gun an… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
We have a 2001 8.1 liter Horizn engine. It appears a temperature
We have a 2001 Mercruiser 8.1 liter Horizon engine. It appears a temperature sensor goes off when the temp gauge shows 175 degree F. Engine goes to idle when sensor initiates alarm. After 1-2 min. ala… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have 2003 volvo penta 8.1 GIs with about 300 hrs. Lately
I have 2003 volvo penta 8.1 GIs with about 300 hrs. Lately will running @ about 3250 RPMs I get warning sounds which cuts back on my engines. I check My temps they are @ 175 degrees, oil pressure is u… read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
1,009 satisfied customers
I have a 2005 Cobalt with a Bravo 3 and a 496 HO. It was used
I have a 2005 Cobalt with a Bravo 3 and a 496 HO. It was used in fresh water for its first season and salt for the next 3. I am having a cooling problem. The engine is runnig nice at 170 -175 degrees,… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
I have a 5.7 fuel injected I believe about 270 HP factory installed
I have a 5.7 fuel injected I believe about 270 HP factory installed original in a 2000 WA250 Sportcraft engine is running about 190-200 degrees usually stays about 170 this has been a gradual increase… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
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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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