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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
2001 496 mag mercruiser. pulled boat out of storage now i
2001 496 mag mercruiser. pulled boat out of storage now i have no fresh water pressure (exhaust is dry). worked fine last year… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,063 satisfied customers
I have a mercruiser 496 mag ho, and it won't rev over 3000
I have a mercruiser 496 mag ho, and it won't rev over 3000 rpms. No beeps or alarms changed plugs fuel pressure is good. Plugged in scanner no codes that would affect this situation. So i unplugged th… read more
Charles
Charles
Certified Mercury Tech
5,752 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
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there I have a 2001 496 mag ho, I was 10 nautical miles
Hi there I have a 2001 496 mag ho, I was 10 nautical miles off shore when the guardian kicked in and Imcould only limp back to port at 980 rpm, the motor runs sweet, no cooling or fluid problems, oil … read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
I have a Bayliner 2855 96 model and it has a 7.4 mercruiser
I have a Bayliner 2855 96 model and it has a 7.4 mercruiser with bravo 3 drive and 26 p props on it . i was out with a group of 6 adults on board and it could not get up on to the plane. the engine wa… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
2,681 satisfied customers
Chevrolet Silverado 2500: 2001 496 ho mercruiser (chevy), we
2001 496 ho mercruiser (chevy), we just put roller rockers on and they hit the valve cover. We only need about .150 more clearance. We have already shortened the poly locks and machined a little off t… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,063 satisfied customers
2004 Baja 27.5 with a mercruiser 496 mag engine (not HO) had
2004 Baja 27.5' with a mercruiser 496 mag engine (not HO) had water in the 8 spark plug slot. No water in any other slots. Drained and dried, put a new starter on boat started several different times … read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have a 2004 Conquest Top Cat with a 496HO. When the engine
I have a 2004 Conquest Top Cat with a 496HO. When the engine is cold, like on the first start of the day, it runs very rough and smells extremly rich. After about five minutes it clears up and runs gr… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 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
23,063 satisfied customers
Hi all. I have a 496 ho mag in my searay and the problem is
Hi all. I have a 496 ho mag in my searay and the problem is it is a bit loud with the pipes straight out the back. The Question is how much performance will i loose by going back through the leg or pu… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,063 satisfied customers
I have twin 8.1S mercruiser engines. My manifolds are starting
I have twin 8.1S mercruiser engines. My manifolds are starting to show corrosion. I read that mercruiser is backing all engines with aluminum manifolds. Is this true? I was also told by a mercruiser m… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
mercruiser 496 ho will not rev beyond 4200rpm.The boat is acrownline
mercruiser 496 ho will not rev beyond 4200rpm.The boat is acrownline 255ccr,the boat and props are clean,the prop spec is correct just had 100hr service, no faults recorded… read more
shane j forrest
shane j forrest
Vocational, Technical or Trade Scho
270 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
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
Service Manager, Master technician
Technical School
249 satisfied customers
mercruiser 496 mag, power is cut down warning buzzer goes off
mercruiser 496 mag, power is cut down warning buzzer goes off when launching with exhaust thru hull, when launching with captains call going under water, no buzzer, oil pressure fine, water temp fine,… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
hi i have a GXI 5.7 320hp Volvo Penta motor and leg, duro props.
hi i have a GXI 5.7 320hp Volvo Penta motor and leg, duro props. I've just had it anti fouled and the boats just been put back in the water. After warming the boat up and about 3-5mins driving a warni… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a thin film of milky colored oil floating out from the
I have a thin film of milky colored oil floating out from the back of the boat. When I touch this milky film, my finger is covered with black sooth like substance. The boat is equipped with a 4.3L EFI… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
1,972 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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