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My 496 mag ho 2007 keeps overflowing the coolant tanks.
Hi Jason.My 496 mag ho 2007 keeps overflowing the coolant tanks. Engine has not over heated and no alarms. But after time running the boat hard. The coolant tank will fill up on it's on and over fill?… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Perhaps a greenhorn question, but we've been troubleshooting
Perhaps a greenhorn question, but we've been troubleshooting the cooling problems on my boat with 2 1996 7.4 Mercs. It's in the Bahamas which has made the process difficult for parts access and I can … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 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
18,955 satisfied customers
Dominick, 2004 Crusader Engine 8.1 MPI For the last 5 or 6
2004 Crusader Engine 8.1 MPI For the last 5 or 6 years the anti freeze overflow bottle not working. Before starting engine I have to take the antifreeze out of overflow bottle and put back into heat exchanger approx 40 ounces. Seems to be getting worse last year on a 3 hour run when I slowed down going in to port the temp started rising up to about 185 degrees.The next day after engine cooled antifreeze had overflowed the overflow bottle into bilge.I once again removed antifreeze from overflow bottle and put back into heat exchanger and ran the boat back to home port without any issue with rising temps the only thing that continued to happen is that the antifreeze from overflow bottle is not siphoning back into heat exchanger. I must mention that only when the overflow bottle overflows i have to add antifreeze to system.Most case i just remove from overflow bottle and put back into heat exchanger. Also no visible leaks any where and have changed the thermostat made no differance at all. On short local runs engine temp 160 to 165 no problem there. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 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
18,955 satisfied customers
I am working on a 496 MerCrusier S/N OW612285 and have
I am working on a 496 MerCrusier S/N OW612285 and have several questions to ask if possible. (1) What year is the engine? (2) The engine is port injected is this correct for this engine? (3) Is the en… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
1981 TMD 40. One engine has a pressurized system, the reservoir has the cap and the overfl
1981 TMD 40. One engine has a pressurized system, the reservoir has the cap and the overflow outlet is capped off. The other engine has no cap and has a drain hose, when I fill up the reservoir and ru… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Horizon Mag 454 HO on a Sundancer 380/2000. Both engines have
Horizon Mag 454 HO on a Sundancer 380/2000. Both engines have about 310 hours. Port engine is steaming (white smoke). Water flow between port and starboard the same. Port Eng temp 1 degree lower than … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
Hi, I just replaced a hot water heater that runs off the
Hi, I just replaced a hot water heater that runs off the heat exchanger of my Mercruiser 350 CID 5.7L inboard engine. I added coolant since the heat exchanger hoses were replaced and the new water hea… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 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
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
18,955 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
18,955 satisfied customers
i have a older sangster boat and want to hook an auxillary
i have a older sangster boat and want to hook an auxillary heater to the 470 mercruiser engine is this a safe thing to do ie will the water pump handle the extra fluid movement required and also is th… read more
John White
John White
Marine Mechanic
Vocational, Technical or Trade Scho
306 satisfied customers
I would like to flush and change the anti-freeze on the fresh
I would like to flush and change the anti-freeze on the fresh water cooling side of my Mercruiser 350 Magnum MPI engine. It is a model year 2004 with the dealer installed fresh water cooling package w… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
I have a 1993 Tiara Model Open 2700 with twin inboards Mercruiser
I have a 1993 Tiara Model Open 2700 with twin inboards Mercruiser 5.7L 350/250. These are carborated engines (probably manufactured in 1992) I ahve owned the boat since 2006. Each engine is losing coo… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 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
i have a 170 hp. 3.7 4cyl. mercruiser inboard. when i pour
i have a 170 hp. 3.7 4cyl. mercruiser inboard. when i pour water in to the cap it is coming back out a hole in the lower unit up next to the transom on the left side. i replaced the heat exchanger yes… 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

1,074 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, 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

306 satisfied customers

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

Jason

Jason

Marine Mechanic

18,955 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,406 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

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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