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Looking at the diagram of the exhaust system their seems to
Looking at the diagram of the exhaust system their seems to be a coolant sensor and a temp sender. We installed coolant sensor and still no reading at dash. Dont know where sender is an dont know if t… read more
Noel Schembri
Noel Schembri
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Diploma
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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
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Vocational, Technical or Trade School
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I just re powered my 2007 crownline 250 cr 350 mag mph with
Hi I just re powered my 2007 crownline 250 cr 350 mag mph with a 496 ho engine. Ho do I connect the tachometer. I have an analog tachometer … read more
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Matthew John
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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
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I have to replace the idler pulley on my 496 mag HO engine.
I have to replace the idler pulley on my 496 mag HO engine. Mercury marine sent a photo of it to me (manual 30 section 4C tensioner) but did not explain how to release the tension so I can remove and … read more
Tan
Tan
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Certified Marine Technician
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John: Do you know of any after market boat services in the
John: Do you know of any after market boat services in the Austin TX area that can reflash a mercrusier computer on a 496 MAG HO. I have a IAC 155 fault code coming back even after the IAC was replace… read more
Tan
Tan
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Certified Marine Technician
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I have a Formula 370ss with twin 496 Mags HO. Went to take
I have a Formula 370ss with twin 496 Mags HO. Went to take it out last night and getting to about 1,400 RPM the engines start cutting out and low on power. Acts like its not firing on all cylinders bu… read more
Jason
Jason
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Vocational, Technical or Trade School
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Why wont the tach work on my 496 mag ho? I could have sworn
why wont the tach work on my 496 mag ho? I could have sworn it worked the other night when I was at the sellers house but didnt work on the sea trial. I tried pulling harness off engine an sprayed con… read more
Jason
Jason
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Vocational, Technical or Trade School
22,858 satisfied customers
Next question -- I am now trying to decide between two boats
Next question -- I am now trying to decide between two boats as follows: 1. 2005 Cobalt 272 with a MerCruiser 496 Mag (375-hp) w/Bravo 3 drive 2. 2006 Cobalt 272 with a Volvo 8.1L Gi (375-hp) w/duo pr… read more
Tan
Tan
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i have a 496 mag ho with 200 hours its a 2002 it looses rpms
i have a 496 mag ho with 200 hours its a 2002 it looses rpm's by itlelf. i was going at about 5000rpm and all of a sudden it dropped to 4000. also it hs a hard time planing out i noticed its at 3000rp… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I have a 2002 Powerquest with twin 496 Mag HO engines. The
I have a 2002 Powerquest with twin 496 Mag HO engines. The starbard side engine is blowing the fuse link on top of the starter. This only happens when RPM's are above 3000. I have checked everything f… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I need a electrcial schematic of my mercruiser 496 mag ho engine.
I need a electrcial schematic of my mercruiser 496 mag ho engine. My alternator is functioning but not charging the battery.… read more
Jeremy R.
Jeremy R.
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I keep getting water in some cylinders on my merc 496 mag engines.
I keep getting water in some cylinders on my merc 496 mag engines. the engines are only 4 yrs old , never overheated and have been winterized propertly!!!! I can take out the plugs and pump the water … read more
Jeremy R.
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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
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Is there a current link for Service Bulletins from 2003 on
Is there a current link for Service Bulletins from 2003 on? I'm interested in one pertaining to the 500 HP EFI Bravo engine. I know the prior build the 496 MAG HO had a problem with the push rods. I t… read more
mercmastertech
mercmastertech
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i have a 2003 baja 33 w/ twin 496 mag hos. one engines alarm
i have a 2003 baja 33' w/ twin 496 mag ho's. one engines alarm system is giveing me 2 short beeps about every 4 minutes. the boat is wired for smartcraft but just has gaffrig guages. the water temp., … read more
ROCKET
ROCKET
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Hi; How do I do a freashwater flush on my 496 ho mag if I go
Hi; How do I do a freashwater flush on my 496 ho mag if I go into saltwater? I cant find the intake hose ect.Thanks… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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I have an 07 496 ho mag and a warning alarm just came
I have an ''07 496 ho mag and a warning alarm just came on it is a short intermitent tone all fluids and guages are reading normal do have any input on what this problem could be?… read more
Ted G.
Ted G.
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Vocational, Technical or Trade Scho
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

2,678 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

22,858 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,409 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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