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Cat Engines

Discussion in 'Engines' started by HOBBES II, Jul 18, 2011.

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  1. HOBBES II, Jul 18, 2011
    #1
    HOBBES II

    HOBBES II New Member

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    I have a 2004 cabo 35 flybridge with 2 - 450HP 3126B engines.
    They appear to run consistently hot - 195 - 200D

    I have just replaced the port heat exchanger and cleaned the core on the starboard side.
    The raw water impeller was checked prior to launch.
    I believe these engines should be running around 185D. Any ideas?
  2. Yachtjocky, Jul 18, 2011
    #2
    Yachtjocky

    Yachtjocky Senior Member

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    Are you sure the engines are actually running hot as most of those boat / engine packages had to have a shunt installed at the gauges. Do you have digital or analog guages.
  3. HOBBES II, Jul 18, 2011
    #3
    HOBBES II

    HOBBES II New Member

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    I have analog gauges. We put a heat gun on the engines and they are running 10 degrees lower than the reading on the guages. Still seems high to me.

  4. Yachtjocky, Jul 18, 2011
    #4
    Yachtjocky

    Yachtjocky Senior Member

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    ask your cabo dealer to install the shunts and you should be fine.
  5. Capt J, Jul 18, 2011
    #5
    Capt J

    Capt J Senior Member

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    They're supposed to run this hot from what I've seen and I ran many sets when new. I'd usually see 196-198 degrees on the CAT displays........Some of the 3126B's even ran 202-204 at cruise when brand new or they might have been the c7's ........
  6. RER, Jul 18, 2011
    #6
    RER

    RER Senior Member

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    I recently did a sea trial on a 2005 32' Topaz express with the same motors. Both ran at 198 degrees... I was told Cat used higher temp thermostats to meet tier 2 emission standards (at that time). That boat ran like a bat out of hell.
  7. Capt J, Jul 19, 2011
    #7
    Capt J

    Capt J Senior Member

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    Have you called your local marine Caterpillar dealer and asked them? I'm sure they'll confirm what everyone else is saying on here.
  8. CatTech, Jul 21, 2011
    #8
    CatTech

    CatTech New Member

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    Those temps are normal for 3126B engines.

    Edit for specs: The regulator (thermostat) is not fully open till 208 F