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I have a 2007 150 mercury EFI. It is running too hot. Going
I have a 2007 150 mercury EFI. It is running too hot. Going into guardian mode. I have replaced the water pump assembly, 143 degree Thermostats, poppet valve,base gasket, adapter plate gasket, head ga… read more
Charles
Charles
Marine Mechanic
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I recently replaced my impeller and thermostat in my
Hi I recently replaced my impeller and thermostat in my mercruiser 502. Boat has been running great and between 165-175 water temps, then the other day it spiked up to about 190 within a minute of tak… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Cooling problem with my 150 efi v6... one side of the engine
cooling problem with my 150 efi v6... one side of the engine cools the other side ( starboard) gets hot and the alarm will sound.... impeller , waterpump, EVERYTHING is replaced...HELP!!!! … read more
Jason
Jason
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Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 1998 mercury 200 efi that just had a rebuilt motor
I have a 1998 mercury 200 efi that just had a rebuilt motor on it. During break in ran great then I heard a different sound in engine witch at boat ramp the splines on flywheel are stripped. The mecha… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I ahve a 2004 mercruiser 5.0 with dry joing exhaust bravo
I ahve a 2004 mercruiser 5.0 with dry joing exhaust bravo drive. the water pick up has been changed to through hull pick up new raw water pump,new circulator pump.manifolds were removed checked and ap… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Hello, I have a 96 Mariah Z220 with a 5.7 mercruiser, fuel
Hello, I have a 96 Mariah Z220 with a 5.7 mercruiser, fuel injected. My temp gauge hardly moves up if at all. I ran the boat off and on yesterday on the lake for several hours (3-4) it ran great. Soun… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
1994 Mariner 150 Mag EFI. I just had a mechanice replace the
1994 Mariner 150 Mag EFI. I just had a mechanice replace the water pump and impeller. The thermostats were also replaced. First time I ran the motor it was fine at idle and lower RPMs. I put it on pla… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I just had a new Bravo 3 intsalled on my 7.4 merc sea ray 270.
I just had a new Bravo 3 intsalled on my 7.4 merc sea ray 270. runs fine untill you go up on plane above 3200 RPM and the temp begins to swing up and down and then the over heat alarm goes off within … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 1993 Sea Ray with a 5.0 litre LX Mercruiser. My temperature
I have a 1993 Sea Ray with a 5.0 litre LX Mercruiser. My temperature guage is maxing out at 220 degrees. My lower unit water pump appears to be pumping sufficiently, I changed the thermostat and temp … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a Marine 2.5 Liter Magnum EFI that runs great but. when
I have a Marine 2.5 Liter Magnum EFI that runs great but. when on the lake the temp shows its over 200 but I never get any alarms nor does the moter shutdown. I do have water coming out of the pee hol… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I just purchased a refurbished 1980 Beretta 18 foot with a
I just purchased a refurbished 1980 Beretta 18 foot with a 165 Mercrusier I/O, motor is an inline 6... on my 1st trip around the lake last Sundaythe temperature gage spiked out at 240 F about 1/2 way … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
My 1988 V150 has a figure-8 shaped poppet valve cover--one
My 1988 V150 has a figure-8 shaped poppet valve cover--one larger hole where the poppet valve is and a smaller hole,both in the engine block --the small hole has a plug and o-ring that was just laying… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
My boat mechanic that tuned my new used 2001 Chapparal with
My boat mechanic that tuned my new used 2001 Chapparal with a Volvo 4.3 GS engine said the engine does not heat up at all. The temperature gauge does not move and he tested the thermostat ( out of the… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
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.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a merc 150 2004 with only 50 hrs on it. model# 1-150462c.
I have a merc(NNN) NNN-NNNNwith only 50 hrs on it. model# XXXXX It seems to overheat. I had a service by auth merc dealer done in nov 2008 because of its lack of use. Replaced water pump and checked p… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,545 satisfied customers
i wrote last night and you answered my question about a 200
i wrote last night and you answered my question about a 200 merc running hot besides changing complete water pump and popet valve i replaced head gaskets and water jacket gasket all looked good no res… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
i have a 1984 200 hp mercury outbard at idle it runs between
i have a 1984 200 hp mercury outbard at idle it runs between 170 and 220 degrees if i idle it to 2000 rpm it cools down to 145 when i drive boat it wiil heat up to just under 220 ichanged the complete… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
Hi, I have a 1996 Searay Sundancer 250 with a 7.4L engine
Hi, I have a 1996 Searay Sundancer 250 with a 7.4L engine (Bravo III). I am not getting a reading on the Temperature Gauge after summarizing the boat. Thus far I have tried: 1.) Putting Thermostat in … read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
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