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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
2002 baja with twin 496 ho no fuel pressure with key on or
2002 baja with twin 496 ho no fuel pressure with key on or when cranking but can make pumps run by jumping … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
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
Matthew John
Matthew John
Cert II Electronic Engineering
76 satisfied customers
I have a 2008 496 mag with a B1 that i got stuck on a
Hi, i have a 2008 496 mag with a B1 that i got stuck on a sand/mud bar today and now it has a constant warning beep and very reduced power. i turned off and started it again and no beep until i got on… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 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
11,409 satisfied customers
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
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 496 Mag, and was wondering what I could do to it to
I have a 496 Mag, and was wondering what I could do to it to achieve the hp rating comparable to the 496 HO? Thank You… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Im trying to find the serial number for the engine to our
I'm trying to find the serial number for the engine to our boat. It has a Mercruiser 496 MAG inboard motor for our 2001 Mariah 302 Shabah mid cablin. On the top of the engine is a "sticker" that says … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Mercury say: "For maximum corrosion protection, we recommend
Mercury say: "For maximum corrosion protection, we recommend that the engine be flushed with freshwater after each saltwater use." but they do not provide any in-water kits for a boat on a mooring. I … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
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
4,730 satisfied customers
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
What is the length of the rods in an 04 496 Mag HO Also what
What is the length of the rods in an '04 496 Mag HO? Also what is the diameter of the connecting rod jounals? !NONE OF THIS INFO IS IN THE 496 MERCRUISER SERVICE MANUAL I JUST PAID GOOD MONEY FOR !!! … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 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.
5,362 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 want to flush the saltwater out of my 350 mag mpi engines.
I want to flush the saltwater out of my 350 mag mpi engines. They are V-drives with seawater cooling. I am about to install closed cooling but want to flush them first. There is a quick connect hose m… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,396 satisfied customers
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.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
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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

22,043 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

3,847 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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