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I have a 1996 Mercury 225 EFI Serial number 0G373727 i
I have a 1996 Mercury 225 EFI Serial number 0G373727 i replaced the thermostats with 143 degree stats and my motor still reaches about 170 in temp is this correct or should i be using 120 stats for th… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,311 satisfied customers
My 96 Merc 225hp is running hot,165 to 170degrees at mid
My 96 Merc 225hp is running hot,165 to 170degrees at mid throttle and above,put in new thermostats in the spring,replaced poppet valve 3 seasons ago, it just started to do this this week, also new wat… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,311 satisfied customers
I asked you a question a couple weeks back about the
Hello Charles, I asked you a question a couple weeks back about the operating temps of my 2005 150xr6. You helped me narrow down that the exhaust tuner was loose and that was probably causing my eleva… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
2005 Mercury 150 XR6. Have a question about operating
2005 Mercury 150 XR6. Have a question about operating temperature. Boat was new to me last year. Did not have a temp or water pressure gauge when I got it. I installed both this year so I could keep a… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
2005 Mercury 150 XR6. Have a question about operating
2005 Mercury 150 XR6. Have a question about operating temperature. Boat was new to me last year. Did not have a temp or water pressure gauge when I got it. I installed both this year so I could keep a… read more
Jason
Jason
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Vocational, Technical or Trade School
23,311 satisfied customers
I have a 2014 Mercruiser 5.7 fresh water cooled. It
I have a 2014 Mercruiser 5.7 fresh water cooled. It overheated yesterday. I put a gallon of coolant in tonight and ran it. It stayed at 160-170 at dock idling for 15 minutes. I took it for a ride and … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,311 satisfied customers
Mercury opti max 1999 135 overheating thermostats opening poppet
mercury opti max 1999 135 overheating thermostats opening poppet valve opening but still overheating no poppet valve exhaust also looked at water jacket looked clean this problem is making nuts thank … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
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Mercury engine cutting out at high RPM. What can be the issue?
I have a 2003 Mercury 300X. Engine cuts out at approximately 6,100 rpm, with a solid alarm and a flashing motor icon on the smart craft gauge.… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
2001 merc 150 carb engine. S/n 0t395869 , engine is running
2001 merc 150 carb engine. S/n 0t395869 , engine is running warm at idle speed in gear temp around 160-180 and tell tail is weak,anything above idle speed all is good,temp is steady at 140-145 and goo… read more
Charles
Charles
Certified Mercury Tech
5,752 satisfied customers
2003 OPTIMAX 135 OVERHEATING on starport side only? thermostats
2003 OPTIMAX 135 OVERHEATING on starport side only? thermostats changed, temp sensors water pumps ect, changed many times. always acts the same for 5 or 6 years now. install new water pump, get great … read more
Greg Robinson
Greg Robinson
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Vocational, Technical or Trade Scho
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I have a 2005 mercury 150 efi. Runs hot at higher rpm.s cools
I have a 2005 mercury 150 efi. Runs hot at higher rpm.s cools back down at idle. New water pump and t-stat.s. I was thanking popit valve, but don,t want to just throw parts at it. water intake OK, Wat… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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2005 merc 2 stroke runs at 180 degrees at 3200 and above and
2005 merc 2 stroke runs at 180 degrees at 3200 and above and below 1500 degrees at 2000 rpm the temp rises until rpms are increased. water pump checks good, poppet valve good, removed the orfices from… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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The warning sensor goes off at about 3000 rpm and shuts down
The warning sensor goes off at about 3000 rpm and shuts down the motor on my 150 Merc Optimax. Oil reservoir is full, water pump is working fine, fuel level is fine. Getting worse about how often it h… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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I have a 1995 Mercury Black Max 175 hp outboard that is overheating
I have a 1995 Mercury Black Max 175 hp outboard that is overheating at lower speeds. When I go fast it cools. I replaced the water pump but the old one looked good. I checked the t-stats and they look… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
4,730 satisfied customers
I have a 1998 Promax 225 that has the overheat sensor going
I have a 1998 Promax 225 that has the overheat sensor going off we have tested the water temp with a thermometer and it is in the normal range… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
4,730 satisfied customers
Mercury 200hp Hi, I got a 1994 200hp carburated V6 2.5
Hi, I got a 1994 200hp carburated V6 2.5 Mercury with a corroded midsection and steering arm, found a 2001 Mercury 200hp carburated with a bad powerhead, can i transfer my 1994 powerhead to 2001 witho… read more
Noel Schembri
Noel Schembri
Marine mechanic
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I have a Mariner Optimax 135 HP outboard (2005 mod). The issue
I have a Mariner Optimax 135 HP outboard (2005 mod). The issue is that at idle speed the temperature stays steady at about 140 degrees F, and by increase the engine speed to about 1600 rpm the tempera… read more
Jason
Jason
Associate Degree
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What should the water temperature (degrees) be at high speeds
What should the water temperature (degrees) be at high speeds for a 1993 Mercury 200 EFI. Bob Davenport… read more
Captain Dave
Captain Dave
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Master's Degree
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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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