Engine Temp

[bliss]

My 1997 SD 330 has Merc 454s-no genny and does not carry a lot of extra weight. I just had the impellers replaced. The engine temp on both engines is still 175 degrees after warm-up and running at 3300 rpm. They have about 400 hours on them. That seems hot to me. Should I be concerned?

 

[rondds]

Nope. Normal. Be concerned if you see the temp creep up over that number as you increase load and/or speed. These engines are designed to run at 170-180 degrees F. If you're concerned pick up a cheap-o laser temp gun an shoot some readings while running. Elbows should be warm but not scalding to the touch all the time - they'll get hotter once you shut down so don't check their temps while not running.

 

[mwph]

My gauge performs exactly the same every time I run the boat. It takes a few minutes to gradually climb to 170 and barely moves until I shut down.

 

[Nehalennia]

I'm consistently one needle width warmer than the 170 mark.

You're fine as Ron said, as long as it's consistent.

 

[Spot]

Todd, do you have closed cooling on your tub?

 

[bliss]

Thanks. I'll sleep better now.