This is a new motor with 10 hours on it. I did not notice any high temperatures last fall when idling. Now the motor is showing a high temperature of up to 160 degrees when idling in a no wake zone in 51 degree water. No high temperature alarms sound. On plane the temperature is around 85 degrees. Is the idle temperature normal?
Seems high. I was thinking 130ish was normal. May be a thermostat not opening..ask Don and see if he can help out.
I think that's normal. I run a 175 opti, and it will go 165 before it starts to fall.
How is water pressure?
Thanks
/Martin
Askeladden 635 Freestyle
Mercury Verado 300
Welcome to BBC!
Since this engine utilizes 143 degree thermostats, it's not abnormal to see 160-161 degrees at idle (especially under load).
However.... most will remain in the 135-155 degree range.
What is your current WATER PRESSURE at idle (preferably as indicated on a Smartcraft Instrument) when you're at this temperature?
When was the water pump replaced (in a fishing application- recommended ONCE PER YEAR, or every 100 HOURS, whichever occurs FIRST).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Water temperature is 2-3 at idle and 15 at wot on Smart craft Instrument. This is a new motor with 10 hours on the engine and water pump. Seemed like the temperature was around 125 last fall when idling through a long no wake zone though I do not remember for sure. I believe the temperatures did remain in the 135-155 degree range most of the day so am relieved. Will take the boat out again next week and verify psi and temperatures.
<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by gfugate »</td></tr><tr><td class="quote">Water temperature is 2-3 at idle and 15 at wot on Smart craft Instrument. This is a new motor with 10 hours on the engine and water pump. Seemed like the temperature was around 125 last fall when idling through a long no wake zone though I do not remember for sure. I believe the temperatures did remain in the 135-155 degree range most of the day so am relieved. Will take the boat out again next week and verify psi and temperatures.</td></tr></table>
Have you perhaps mixed up Water Pressure and Temperature above (I hope so)?
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
You are correct, water pressure is 2-3 at idle and 15 at wot. Temperatures are the higher numbers. I will keep a close watch the next time I am out, but am not quite as concerned based on your replies. Thanks to all for responding.
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