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I have 2001 mercruiser 7.4 mpi that overheats at high rpm.
I have 2001 mercruiser 7.4 mpi that overheats at high rpm. Anything below 3000 rpms is running about 170 degrees. with the seawater input taken off the thermostat housing and a hose put in the housing… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Motor: 1990 Yamaha ETLD sn: 6L1 L 302500 Problem: overheat
Motor: 1990 Yamaha ETLD sn: 6L1 L 302500 Problem: overheat alarm above 1700 rpm Observations (while running on ears): seems to have a lesser amount of water exiting thru hub. Water is exiting from ope… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a BMW Hatz D50 engine with hot water system attached
I have a BMW Hatz D50 engine with hot water system attached to the coolant line with a ball valve vent at the top of the tank. When replacing the coolant through the radiator cap into the top of the b… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a boat with a Volvo Penta 5.7 GiF engine. The temperature
I have a boat with a Volvo Penta 5.7 GiF engine. The temperature gauge on the control panel reads low going to zero when accelerating, much lower than its normal operating temp around 165-170. It coul… read more
KKassel
KKassel
OWNER
High School or GED
381 satisfied customers
Hi I have 1989 wave runner GP760 . once an awhile she runs
Hi I have 1989 wave runner GP760 . once an awhile she runs hot ? is their a thermostate or sensor that I could check ? the bottom intake is clean . no seawweed or fod in the cage. the water coming out… read more
Jeremy R.
Jeremy R.
MarineTechnician
9,020 satisfied customers
i have a yamaha sx 210 at the end of last season my right engine
i have a yamaha sx 210 at the end of last season my right engine overheat light started to come on, i never ran it hot I shut it down. it never overheated right away, always after running for over 30 … read more
Jeremy R.
Jeremy R.
MarineTechnician
9,020 satisfied customers
1989 Mercruser 5.7 L V-8, Alpha one drive. Engine starts to
1989 Mercruser 5.7 L V-8, Alpha one drive. Engine starts to overheat when pushing RPMS 3800 & above. It creeps slowly from 146 to 180 degrees or more. As soon as I back off the throttle it comes down … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Have a 1997 Mercruiser 5.7V inboard sterndrive boat is scr24
Have a 1997 Mercruiser 5.7V inboard sterndrive boat is scr24 Maxum Cruiser.The boat heat sensor will go off if rpm reaches 2700 rpm. I will pull back on throttle and immediately the thermostae/ heat g… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
704 satisfied customers
i have a mercruser 5.0 inboard and when i run 4000 rpm it runs
i have a mercruser 5.0 inboard and when i run 4000 rpm it runs hot about 190 f if i run for a period of 5 minutes or more but if i run 3000 rpm it stays below 190 f . i also have duel props on the out… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
Can a motor slip at high RPM level when it is engaged/with
Can a motor "slip" at high RPM level when it is engaged/with a load on it? *I have two recently rebuilt MERCRUISER big block engines *I took out my boat, a 1987 35 foot SeaRay this afternoon *At 3200 … read more
shane j forrest
shane j forrest
Vocational, Technical or Trade Scho
270 satisfied customers
I Have a 2008 Baha 23 Foot Boat and would like the procedure
I Have a 2008 Baha 23 Foot Boat and would like the procedure for winterizing the engine 496 Mag and the oil filter number and grade of Oil i should use.… read more
Rick Gay
Rick Gay
High School or GED
106 satisfied customers
when running my 120 mercruiser inboard with muffs how much
when running my 120 mercruiser inboard with muffs how much water should come out of the exhaust bellows in the rear of the boat and what temp should my motor run?… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have a 2004 Merc 5.0 and it has 166.1 hrs on it. I keep
I have a 2004 Merc 5.0 and it has 166.1 hrs on it. I keep up on the maintenance very well. Just recently it started running hot (close to 220 degrees) and almost over heating and then it will start ru… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
How do I change the thermostat in a Volvo boat 5.0L V-6 FI
How do I change the thermostat in a Volvo boat 5.0L V-6 FI Volvo Penta motor for my 2003 Four Winn 210 Horizons?… read more
Dr. Joe
Dr. Joe
Bachelor's Degree
198 satisfied customers
I have a 1996 225HP EFI Mercury Outboard it runs warm sometimes
I have a 1996 225HP EFI Mercury Outboard it runs warm sometimes 150-170 degrees and sometimes runs normal it if I am not watching sometimes it will set the overheat alam off but if I throttle back to … read more
TOM
TOM
Vocational, Technical or Trade Scho
196 satisfied customers
Hi I have a 350 mercruser engine that is running hot. At idle
Hi, I have a 350 Mercruser carburetor engine that runs hot at idle and hotter on way. At idle it runs at 145 degrees without a thermostat. On way - at the dock tied up 1200 RPMs the temperature rises … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
I have a volvo penta 4.3 and the first time I took it out this
I have a volvo penta 4.3 and the first time I took it out this year the left manifold got so hot that the blower tubing caught fire. However, the motor did not overheat. The manifold on the right was … read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a 1996 Maxum with a v eight engine, and brovo III out
I have a 1996 Maxum with a v eight engine, and brovo III out drive. The boat hasn't been run for two years, but started and ran great a week ago. The othern day, I started it again and it wants to ove… read more
Michael
Michael
master marine technician/charter captain
Vocational, Technical or Trade Scho
256 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

704 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

17,310 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,264 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,729 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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