Engine Break-in Thermostat or No Thermostat?

Engine, Trans & Driveline

  1. EngineerDoug

    EngineerDoug Well-Known Member

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    Folks,

    The title pretty much says it all - what is the consensus on engine break-in? Thermostat or no thermostat? BTW we are talking about temperature climate, maybe 60 or 70 degree day. Thanks.
     
  2. Bill76

    Bill76 Well-Known Member

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    Put in a thermostat , you want heat in the motor.
     
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    • toolmanmike

      toolmanmike Moderator Staff Member FBBO Gold Member

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      Thermostat. I use 180°. Warm it up in a pan of water on the stove with a known acurite thermometer to make sure it works as it should.
       
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      • 440Coronet500

        440Coronet500 Well-Known Member

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        Yes, install the thermostat! 440'
         
      • Jerry Hall

        Jerry Hall FBBO Gold Member FBBO Gold Member

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        Yes on the thermostat.
         
      • Don Frelier

        Don Frelier FBBO Gold Member FBBO Gold Member

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        Watch for leaks and have a fire extinguisher and a hose ready just in case.
         
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        • ruffcut

          ruffcut FBBO Gold Member FBBO Gold Member

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          YES!Thermostat. Like others said, you want heat in the engine. RUFFCUT
           
        • 91r/t

          91r/t FBBO Gold Member FBBO Gold Member

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          Before you install the stat, fill the engine with coolant as much as possible through the stat neck in the water pump housing. I often let it burp several times over a few days until the block is chucked full and then I leave the level a tad lower than the stat and install the stat. This keeps 98% of the air locks out of the equation because the block is full and there's little to no room for air behind the stat. I have never had one air lock when doing it this way. It is very hard to get the stat to burp on a fresh motor when the block is empty and you are fighting all that air.
           
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          • Stanton

            Stanton Well-Known Member

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            Make sure you install the rad cap !! Years ago we were breaking in the motor with no rad cap. When I shut it off it puked the entire contents all over a buddy who was standing at the front of the car. He was scalded BIG TIME !! The skin literally fell off his upper body.
             
          • EngineerDoug

            EngineerDoug Well-Known Member

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            Got it; thanks!
             
          • MoparLeo

            MoparLeo NRA PATRON LEVEL LIFE MEMBER FBBO Gold Member

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            Pressure test the cap, even if it is new. They don't always work. 16 lbs.
             
          • 493 Mike

            493 Mike FBBO Gold Member FBBO Gold Member

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            Drill a small hole in the stat ( 1/8" ) to help bleed air it won't slow the warm up noticeably.
            Mike
             
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            • joemish

              joemish Well-Known Member

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              ALWAYS use a thermostat. No exceptions.
               
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