C15 SDP engine brake problems

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Travelr23503, Feb 4, 2021.

  1. Travelr23503

    Travelr23503 Bobtail Member

    2
    0
    Jan 25, 2017
    east Tenn
    0
    I have an SDP series C15. it has installed a jacobsen 340E jake. I have been told it's the wrong jake for that model engine. It engages when I release the throttle, however it growls a little but doesn't roar. and it's squeezes a little but doesn't grip. under any substantial load (meaning over 20k on deck and 70k gross) it doesn't slow me down until I drop at least 6 gears (13sp). and it barely slows me down any sized hill empty until I drop 2-3 gears. anyone have any ideas?
     
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  3. pushbroom

    pushbroom Road Train Member

    1,722
    6,986
    Sep 1, 2012
    0
    SDP came with a IVA/Jake head combo.
    Rockers are different between a 6NZ and a SDP.
    Do your rockers match your jake brake?
     
    Don379 Thanks this.
  4. ETechOklahoma

    ETechOklahoma Bobtail Member

    2
    1
    Dec 1, 2020
    McAlester Oklahoma
    0
    Check engine light on? Any codes for cylinder actuator or VVT pressures? Miles since last overhead?
     
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