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I have a 2007 mercruiser 496 mag ho. The the port reservoir
Hello. I have a 2007 mercruiser 496 mag ho. The the port reservoir keeps filling up with water and overflowing from the cap. Could it be my heat exchanger or my hot water heater. I'm not sure how to d… read more
DAVID BALLARD
DAVID BALLARD
OWNER
Vocational, Technical or Trade School
10 satisfied customers
I recently purchased a 2007 24ft River jet boat and want to
I recently purchased a 2007 24ft River King jet boat and want to change the oil but I dont know what oil the previous owner was using. On the oil fill cap it says 5w-30 but my manual recommends 10w-40… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,605 satisfied customers
My engine is a Perkins 4.236. I bought the boat 2.5 years
My engine is a Perkins 4.236. I bought the boat 2.5 years ago. The exhaust warning light and alarm goes off after about 15 minutes running the engine at load at 1200 rpm at the dock. Sea strainer is c… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
What is the proper way to refill the coolant in my Mercruiser
What is the proper way to refill the coolant in my Mercruiser engine? I replaced my exhaust manifolds and of course had to drain the coolant out of my engine. Now I need to refill. Is there anything s… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,605 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
388 satisfied customers
I have problem with MerCruiser MAG 496 on mine Chaparral 286.
I have problem with MerCruiser MAG 496 on mine Chaparral 286. When I drive for a while 20 to 30 mph for 30 40 minutes and stop, temperature is between 156 to 161, 161 when I stop. If I start the engin… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,605 satisfied customers
I have a Volvo Penta MD22A and my coolant temperature gauge
I have a Volvo Penta MD22A and my coolant temperature gauge is reading 120 deg.C The temperature of the coolant has barely reached warm to the touch from the radiator cap. Is it possibly the coolant p… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,605 satisfied customers
My header tank on the 2GM20F is filling the reservoir to overflowing,
My header tank on the 2GM20F is filling the reservoir to overflowing, but coolant does not flow back to the tank when the engine is cool or off. Changed the header tank cap but no change. Eventually n… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
got a 2005 498 mag mercruser 92 hrs on engine. After 3 min
got a 2005 498 mag mercruser 92 hrs on engine. After 3 min run time constant alarm comes on, got oil and coolant?… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
Hello I have 2008 496 HO. The boat has 250 hrs and has never
Hello I have 2008 496 HO. The boat has 250 hrs and has never had a problem until this spring. It started having over heating problems so we replaced the impeller and that seamed to fix the problem tem… read more
Malta Tech
Malta Tech
Marine Tech
High School or GED
287 satisfied customers
I have a Yanmar 30 in my 2005 Hunter 36 sailboat. I am currently
I have a Yanmar 30 in my 2005 Hunter 36 sailboat. I am currently on the ICW and am having a overheat light problem. The light would come on any time I run the engine at 3200-3400 rpm on the occasion i… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,605 satisfied customers
Twin crusaders 7.4 L on a pursuit 34. We are having problems
Twin crusaders 7.4 L on a pursuit 34. We are having problems with one engine that suddenly overflows coolant into reservoir. It will spew. The engine has not overheated to any extreme. We assumed ther… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
hi i have a yanmar 3 HM 35 F. i took the boat out yesterday
hi i have a yanmar 3 HM 35 F. i took the boat out yesterday in order to run the engine, discovered the engine overheats when run ant 3,000 rpm (alarm turns on). when slowing down to 1,000 or 2,000 the… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have a formula boat withe twin Mercruisers 496 Mag. Both
I have a formula boat withe twin Mercruisers 496 Mag. Both engines are working well. I checked the fluids as usual before leaving the dock. The coolant reservoir on the port engine was completely empt… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
20,605 satisfied customers
I have a 2007 volvo penta 8.1 Gi-H with 20 hrs and am experiencing
I have a 2007 volvo penta 8.1 Gi-H with 20 hrs and am experiencing increased engine temps when the boat is running between 2000 and 2500 rpm. the temp runs normal at 3000rpm but when in rough seas we … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
i have a volvo penta aq125a im having overheating problems
i have a volvo penta aq125a im having overheating problems the seawater pump is cold on both tubes the circulating pump is turning but the exahust manifold is very hot is there to check this for being… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
Why would you drop 6 to 8 miles per hour after replaceing the
Why would you drop 6 to 8 miles per hour after replaceing the seales in the out drive? Have a 26' Formula Bow Rider with 405 Engin.… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
i have 2007 mercruiser 496 mag bravoIII that overheats after
i have 2007 mercruiser 496 mag bravoIII that overheats after running hard and turning off engine. removed alot of hydrilla and replaced impeller. old impeller still intact no fins removed. has closed … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 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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