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4.3 mercrusier new engine installed bought the boat it over
4.3 mercrusier new engine installed bought the boat it over heats at idle only so I replaced lower water pump same thing pulled upper water pump replaced it same thing thermostat was replaced same thi… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
1989 34 searay express 34 both engines run at 165 degrees
1989 34 searay express 34 both engines run at 165 degrees but gauges show 40 degree difference … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
I have a 2005 Mercruiser Magnum MPI with the SmartCraft
I have a 2005 Mercruiser Magnum MPI with the SmartCraft system. I get a continuous engine alarm when throttling up above 1500-2000 RPM. Alarm goes of when throttle reduced to idle. All dash gauges hav… read more
Michael
Michael
master marine technician/charter captain
Vocational, Technical or Trade Scho
256 satisfied customers
Engine gauge reads between 170-175 degrees. Left side of
Engine gauge reads between 170-175 degrees. Left side of engine is getting significantly hotter than the right...I will burn my hand almost instantly if I touch the exhaust manifold. Water circulation… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,133 satisfied customers
I have a 2011 8.2L mercy stern drive and I'm getting a
Hi, I have a 2011 8.2L mercy stern drive and I'm getting a fault sensor on the smart craft system. Had the same thing last year and replaced the impeller and housing and fixed the problem. 4th trip ou… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
374 satisfied customers
I have a mercruiser 4.3 raw cooled. Running on muffs the exhaust
I have a mercruiser 4.3 raw cooled. Running on muffs the exhaust water is v hot but temp gauge ok. The pipes from balls on top of thermostat housing are cold does this sound right? Thanks… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
I have a 350 MAG MPI Inboard Centre mount 1999. Recently changed
I have a 350 MAG MPI Inboard Centre mount 1999. Recently changed the manifolds and risers, impellor and thermostat. I was told to drill out the small hole in the stainless steel gaskets between the ri… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have a 2007 sea ray 230 select with a 350 mag and bravo three
I have a 2007 sea ray 230 select with a 350 mag and bravo three deive. The other day we took it out and I ran it WOT with the captains call on it ran hot after about 10 minutes. We shut it down to coo… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
Overheat problem mercruiser mpi 5.0 2005 smartcraft, searay
Overheat problem mercruiser mpi 5.0 2005 smartcraft, searay 240 sundancer 2006 Bravo 3 sterndrive raw water cooled. Engine normal at dead idle 600 rpm. Temp is steady at 163 during cruise. Overtemps q… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 7.4 mercruiser fuel injected with a bravo 3 outdrive.
I have a 7.4 mercruiser fuel injected with a bravo 3 outdrive. It is raw water cooled with raw water pump below alternator. the engine would start to run hot when I went over 2500 rpm. I took thermost… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold
i have a mercruiser 496 mpi 8.1 closed coolant sysem manifold sensors throw an alarm at about 175 degrees. The engine temp with a temp gun is 165, the manifold are the same and the risers get up to 20… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar
Have a 5.7L I/O with raw water pick-up pump ( replaced impellar ), installed new 160 degree thermostat. Engines starts fine, temp goes to 180 and stays there. Can cruise for hours below approx. 2500 r… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 2001 sea ray 290 sunsport with twin 350 mags mpis,bravo
I have a 2001 sea ray 290 sunsport with twin 350 mags mpi's,bravo I's with approx 260 hrs on each motor.I bought it last month with 220 hours on it. It had been running fine untill yesterday. Yesterda… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
747 satisfied customers
I have a 2004 Regal 2400 with a 350 Mag Bravo III. Last summer
I have a 2004 Regal 2400 with a 350 Mag Bravo III. Last summer an audible alarm kept going off. Long story short after changing the thermostat, everything performed correctly. Now, this spring, the se… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
converted my v8 mercruiser log stye manifold system to the
converted my v8 mercruiser log stye manifold system to the Center rise model...The problem is that one side of the exhaust runs warm and the other side runs hot ? The temp guage on dash is normal...Wh… read more
Kenny
Kenny
Mercury & Mercruiser Diagnostics
Master's Degree
99 satisfied customers
I own a Regal with a 354 mercruiser mag i/o motor. I bottomed
I own a Regal with a 354 mercruiser mag i/o motor. I bottomed out my boat on a sand bar and motor stalled. I was towed out and got the motor running again. It ran fine at approx 175 degrees for two ho… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have a 2006 Mercruiser 5.0 w/ Bravo III. The engine stalls
I have a 2006 Mercruiser 5.0 w/ Bravo III. The engine stalls at idle after being run 30 minutes or so. The engine will not start again until it has apparently cooled down. I have hade the entire fuel … read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I have a 2002 Mercury 225 EFI on a 23 Sport Pro-Line ...
I have a 2002 Mercury 225 EFI on a 23 Sport Pro-Line Center Console. It runs hot according to the temp guage at around 185 degrees when running around 4000 RPM. When idling it runs around 160 degrees.… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

747 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

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

Jason

Jason

Marine Mechanic

19,133 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,399 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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