Temp goes up when cruising at 5 mph..help?

[stunod]

Hi,<br /><br />I'm wondering if this is normal....<br />During the ny heat wave which was 100 degrees on saturday, I drove my boat at top speed for 1/2 hour and then entered a NO WAKE ZONE 5mph for another 1/2 hour. By the time I got out of the 5mph zone, I noticed that the temp was just a hair shy of the RED ZONE. As soon as I increased my speed (25-30 ) the needle started back down to normal.<br /><br />Question: Should the temp gauge go up that high at 5 mph traving for a 1/2 hour??<br /><br />Thanks in advance,<br />Lou

 

[6MISFITZ]

Re: Temp goes up when cruising at 5 mph..help?

No, that is not normal. What type of motor / outdrive do you have and what year is it?<br />How long has it been since the water pump impeller has been changed?<br />Is the screen for the water pump clear of debris?<br /><br />You might consider posting this topic in the engine section for some more answers but list year, outdrive or outboard, make, etc.

 

[stunod]

Re: Temp goes up when cruising at 5 mph..help?

Hi,<br /><br />The motor is a 470 merc I/O 1986<br />The water pump inside the outdrive was changed this spring. The engine runs cool all day with the exception of going 5 mph for long periods of time.

 

[rickdb1boat]

Re: Temp goes up when cruising at 5 mph..help?

You might try posting this in the I/O section. May get better reponse!<br /><br />Rick

 

[cannonfodder]

Re: Temp goes up when cruising at 5 mph..help?

The timing may be a little off. Just a thought.