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Old 08-07-2008, 06:58 PM
Acnas's Avatar
Acnas Acnas is offline
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Join Date: May 2005
Location: Epping, NH
Posts: 20
Default 2005 Merc outboard High Temp

Friend has a 2005 Merc 150 outboard on a 19 Trophy CC. At 2000-2500 rpm temp gauge climbs to 200-240 within 5 min. Water shoots out of the hose and feels hot. Has steam showing at the back of motor. We never ran hot to get buzzer to sound. At other rpms temp is fine. New thermostats and pop valves. Water pump is new as well and installed correctly. These are trolling rpms so we are hurting. Any help would be great.
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Old 08-16-2008, 10:10 PM
freebie freebie is offline
Join Date: Sep 2006
Location: Massachusetts, close to the beach
Posts: 61
Default Re: 2005 Merc outboard High Temp

we just had a similar problem with a 60 hp four stroke only it was getting an alarm, there was a blockage in the water passage under the powerhead, one of the grommets was mis shaped causing the motor not to get enough water and overheat, pain in the you knowwhat to find and fix
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2005, high, merc, outboard, temp

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