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TOPIC: Temp Problems?

Temp Problems? 14 Jun 2009 13:41 #1

  • Smokeio
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I am a little concerned over my operating temperature. This is my third season, I have a 5.0 MPI, Bravo 3, with 70 hours. Though I am not getting an alarm, my operating temperature has risen slightly. My first season, I remember the operating temp running at 175 degrees. Now it's at about 182 degrees. Though I should have documented it last year, I do remember it running slightly over 175. I've changed the thermostat and no difference. Should I change the impeller? I was talking to someone from Mercury this week about another subject and I asked them about this issue. They told me the gauges are notorious for being inaccurate. Any suggestions?

Thanks.

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Mike
2006 Bayliner 265 Lena

Temp Problems? 14 Jun 2009 13:49 #2

  • JohnL
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Impeller should be changed every other year as a minimum. If it has not been, then start there.

You can borrow a IR temp gun and confirm the gauge reading accuracy, but imo it is more important to find out why the reading is changing (upward).

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Blue Highways
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Temp Problems? 24 Jun 2009 11:40 #3

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JohnL;309384 wrote: Impeller should be changed every other year as a minimum. If it has not been, then start there.

You can borrow a IR temp gun and confirm the gauge reading accuracy, but imo it is more important to find out why the reading is changing (upward).

Thanks for the feedback. I borrowed an IR gun and the temp at the thermostat housing is 158 to 164. I'm going to assume the reason why the gauge is climbing is there may be bad connection in the wiring. I do agree I need to get the impeller changed, just not looking forward to doing it while it is in the water.

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Mike
2006 Bayliner 265 Lena

Temp Problems? 24 Jun 2009 12:27 #4

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If it continues to creep up you'll have to address the problem. Could be the impeller, or could be the initial signs of a cooling system becomming clogged or corroded. Watch it carefully ecspecially at high engine loads like high planing speeds. Meanwhile, enjoy the boat :)

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Blue Highways
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Temp Problems? 24 Jun 2009 14:56 #5

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I borrowed an IR gun and the temp at the thermostat housing is 158 to 164.

158 to 164 is fine. What did the guage read when the gun gave those readings?

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Ralph
Ciera 2855

Temp Problems? 24 Jun 2009 16:03 #6

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Seaquel;314134 wrote: 158 to 164 is fine. What did the guage read when the gun gave those readings?

The gauge read approx 175 to 180.

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Mike
2006 Bayliner 265 Lena
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