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I have 1998 Merc 250 efi offshore. after about 1 hour
I have 1998 Merc 250 efi offshore. after about 1 hour cruising on plane, the oil sensor warning will sound and the engine start to auto shut off (I guess) as the power drops off the alarm stops and th… read more
Charles
Charles
Certified Mercury Tech
5,519 satisfied customers
I have a Yamaha 250 outboard with just 14 hrs. I had it wide
I have a Yamaha 250 outboard with just 14 hrs. I had it wide open on a lake for about 10 minutes and then turned off to fish. 15 minutes later I tried to restart the engine. It would not start, just r… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
HI Looking to buy a 2002 sea ray bowrider with merc 4.0 220
HI Looking to buy a 2002 sea ray bowrider with merc 4.0 220 horsepower engine. Inboard/outboard Boat has been all fresh water to date, and 200 hours. I plan to use in salt water, was told ok, and that… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
We recently (2 weeks) purchased a 2009 Sea Ray 270 Sundancer
We recently (2 weeks) purchased a 2009 Sea Ray 270 Sundancer that has a 350 MerCruiser with ~130 hrs on it. We have had repeated issues with either the O2 sensor alarm or the exhaust sensor alarm. The… read more
Jason
Jason
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Vocational, Technical or Trade School
18,955 satisfied customers
My 5.0 2004 merc cruiser in a 24 sea ray sundeck has intermittent
My 5.0 2004 merc cruiser in a 24' sea ray sundeck has intermittent overheating. ranges from 155 to 185. does not get much hotter than 185 but of course alarm spounds arount 177. Did this last week so … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a 1996 FourWinns 190 equipped with a 4.3 ltr V-6. I
I have a 1996 FourWinns 190 equipped with a 4.3 ltr V-6. I am the second owner, so don't know much about the repair/service history. I bought it three years ago and had the engine and outdrive service… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Question for your Daddy---Please help if can- (Pro-active Maintenance
Question for your Daddy---Please help if can- (Pro-active Maintenance $2300) I just recently changed both my Head gaskets on my(NNN) NNN-NNNNOptimax since I needed to change out Both Motor Mufflers, F… read more
Jason
Jason
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Vocational, Technical or Trade School
18,955 satisfied customers
just bought a boat, took it out for a test drive and idle speed
just bought a boat, took it out for a test drive and idle speed was fine but when i went to accelerate the motor would increase rpm but the boat speed was barely noticeable and when it got to around 5… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I recently purchased a 1988 Sea Ray. It has a Mercruiser 4.3L
I recently purchased a 1988 Sea Ray. It has a Mercruiser 4.3L Engine (S/N 0B931062). A week ago, there was squealing noise coming from the belt that goes around the alternator (it wasn't tight). The s… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 satisfied customers
I have an alpha drive on my 98 sea ray and had an over heat
I have an alpha drive on my 98 sea ray and had an over heat situation where the engine alarm went off and shut down. I am in a marina that had lwo tide when I left the slip. The lower unit kicked up m… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,556 satisfied customers
Hi - I have a 96 Searay w/7.4LX Merc sterndrive. Yesterday
Hi - I have a 96 Searay w/7.4LX Merc sterndrive. Yesterday it overheated while at idle in the marina (seawater impeller shot) and pegged the temp gauge. After I shut it down and let it cool a little, … read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have twin 4.3 liter mercruisers with alpha one drive on a
I have twin 4.3 liter mercruisers with alpha one drive on a 1998 sea ray 290. one engine is running at 400 rpms higher than the other 260 hours. I have recently had them both tuned so plugs and cap ar… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
I have a 1998 Mercruiser 7.4 MPI (L29) with 450 hrs on it that
I have a 1998 Mercruiser 7.4 MPI (L29) with 450 hrs on it that ran fine before it sat for 4 years after being decommissioned by the dealer (Sea Ray). Upon recommissioning, the engine has developed a n… read more
Dr. Joe
Dr. Joe
Bachelor's Degree
198 satisfied customers
I have a 1998 sea ray sundancer with a 5.7 merc and bravo three
I have a 1998 sea ray sundancer with a 5.7 merc and bravo three outdrive. When I am in the slip about to pull out and the boat has warmed up I put the boat in drive and it stalls out. Each time I enga… read more
Dr. Joe
Dr. Joe
Bachelor's Degree
198 satisfied customers
Ihave a sea ray 340 sundancer 2001 with twin 496 mercruisers.
Ihave a sea ray 340 sundancer 2001 with twin 496 mercruisers. Had it out yesterday everything was fine then the port engine rpm drop and an alarm sounded. Temp and oil pressure were fine. Manual says … read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
1,009 satisfied customers
I have a 2001 Chaparral280 SSI with a 7.4 Merc brovo 3 outdrive.ran
I have a 2001 Chaparral280 SSI with a 7.4 Merc brovo 3 outdrive.ran in saltwater.I have changed everything in the coolong system { open cooling }Top to outdrive intake hose. At idle and WOT the temp i… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
I have a1996 Larson Cabrio 310 with 5.7L closed cooling and
I have a1996 Larson Cabrio 310 with 5.7L closed cooling and Alpha Gen 2 drives , the port engine will over heat once on plane and cruising, the temp. keeps rising setting off the alarm, once i back of… read more
Scott
Scott
Vocational, Technical or Trade Scho
10 satisfied customers
I have a 2003 Sea Doo Islandia, low hrs. 240 EFI, Optimax ...
I have a 2003 Sea Doo Islandia, low hrs. 240 EFI, Optimax Merc. 4th of July, charged and took out first time this year. Ran great. 1/2 hr. or more she started to beep continuously, orange warning lite… read more
JamesHorvath305
JamesHorvath305
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Meet the Experts:

Ted G.

Ted G.

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40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

Dominick

Dominick

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John White

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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Jeff G.

Jeff G.

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Captain Dave

Captain Dave

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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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