Cat 3406e getting hot

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Nestor, Aug 3, 2020.

  1. Nestor

    Nestor Light Load Member

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    Oct 21, 2015
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    I was wondering if I can get some help please. I have a 3406e on a 96 kenworth w900 that gets pretty warm . When parked at idle for 5 10 min, my coolant temp starts rising pretty fast. Also when I hit a small hill it also starts climbing pretty fast and this is while empty . This happens with fan off. When I hit my fan, it cools it down really fast at idle and when I hit a small hill.
    I recently rebuild engine . New radiator and water pump. Before rebuild it was kinda doing same thing . Ended up rebuilding because I had 2 broken pistons. Throwing coolant tru overflow . I went from 190 to 180 to 170 thermostats . The 170 help a little but eventually will start rising . Any one have any clue why this is happening thank you
     
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  3. zinita17601

    zinita17601 Road Train Member

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  4. p608

    p608 Road Train Member

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    thermostats, low coolant
     
  5. Inderjit

    Inderjit Light Load Member

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    The fan cools it down when switched on manual. Is the fan coming on automatic at 195 degrees?
     
  6. Nestor

    Nestor Light Load Member

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    Oct 21, 2015
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    Would a clogged oil cooler do it? My oil temp always around 150 170
     
  7. Nestor

    Nestor Light Load Member

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    Oct 21, 2015
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    Before I rebuilt it I had a sensor thermo sensor that was set 195. One of the tabs broke off on top so I replaced it but I got a 205 one . My fan doesn’t come on at 205 . But I’m turning on fan manually . I plumed in a external gauge that I bought for autozone right into thermostat housing . It reads like 15 20 degrees hotter than the one on my dash
     
  8. Inderjit

    Inderjit Light Load Member

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    Sep 17, 2017
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    If the fan does not come on at 205 then that is your problem. if you short the terminals on the fan temp sensor together when the engine is idling the fan should engage. If it does the wiring is good and you need a new temp sensor.
     
  9. Nestor

    Nestor Light Load Member

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    Oct 21, 2015
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    Yea that’s what I was thinking . But temp climbs fast when at idle and when I’m loaded or empty going on a small hill .
     
  10. 062

    062 Road Train Member

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  11. p608

    p608 Road Train Member

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    He said it's new
     
    062 Thanks this.
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