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Thread: Help Me Better Understand About a Runaway Diesel

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  1. Top Of Page | #1
    n_hall's Avatar

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    Help Me Better Understand About a Runaway Diesel

    How concerned should I be about a runaway on a 2017 RAM?

    Is this something Cummins has resolved over the years?

    From what I understand blocking off the intake and starving the engine of oxygen is the best way to stop it.


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    #1 VENDOR cumminsdieselfreak's Avatar

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    Whoaaa, how come you're worried about a runaway diesel?

    In my opinion it's not anything that I'd ever worry about with your truck.

    Last runaway diesel I remember within the last 20 years was 1 Duramax, other than that it was old Detroit's.

    My advice, if i were you I'd be more worried about what I was going to have for supper tonight than your diesel running away.

    2018 Ram 2500 4x4 G56
    Romans 10:13

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  5. Top Of Page | #3
    Old & Grumpy! Polaraco's Avatar

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    Quote Originally Posted by cumminsdieselfreak View Post
    Whoaaa, how come you're worried about a runaway diesel? In my opinion it's not anything that I'd ever worry about with your truck. Last runaway diesel I remember within the last 20 years was 1 Duramax, other than that it was old Detroit's. My advice, if i were you I'd be more worried about what I was going to have for supper tonight than your diesel running away.
    Nailed it.

    But if you must know, block the air at the turbo intake with a thick piece of plywood or 2 X 6.

    If you try to block at the filter, there's a chance you could swallow the plastic duct.


    2003- 3500 RWD Automatic.
    S & B intake, BD Intercooler, Pusher Air Horn, MM3 Double R Tuning, Turbo Timer, electric Flex-a-lite fans, FASS 95,
    50 HP tips, upgrade to 351 turbo, 3.42 gears, Twin air compressors, air bags, Remote dual oil filters, Hellwig sway bar, Front Winch. Home made Fuel Heater, BD Exhaust brake with Torque Lock. Tons of TLC

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  7. Top Of Page | #4
    n_hall's Avatar

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    Works for me.

    Thank you.


  8. Top Of Page | #5
    Rambling Rump Ranger! SyN's Avatar

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    I actually didn't know how to take that question - would the engine actually start on its own & engage & move?

    2017 Bighorn (Delmonico Red & Chrome) CC-HD2500-4WD-6.7L-3:42w/Anti-Spin
    Oil: -SHELL- Rotella T6 5W-40 & T5 15W-40 combo w/LF16035
    68RFE/BW44-46/Power Steering: -Red Line- C+ ATF
    Frontend & Rearend: -Red Line- SAE GL-5 75W-90NS
    Many Small Mods: Interior & Exterior
    Mileage: 28,541

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  10. Top Of Page | #6
    #1 VENDOR cumminsdieselfreak's Avatar

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    Quote Originally Posted by SyN View Post
    I actually didn't know how to take that question - would the engine actually start on its own & engage & move?
    If you've never saw a runaway diesel, YouTube it, seriously.

    2018 Ram 2500 4x4 G56
    Romans 10:13

    See what we are up to on:
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    Or Email me at:
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  12. Top Of Page | #7
    BlackBart's Avatar

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    Re: Help Me Better Understand About a Runaway Diesel

    Quote Originally Posted by SyN View Post
    I actually didn't know how to take that question - would the engine actually start on its own & engage & move?
    No but the ones that did also had a tendency to wanna run backwards when ya went to shut em off.

    Good stuff.... Truckers bring it

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  14. Top Of Page | #8
    Rambling Rump Ranger! SyN's Avatar

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    Ok - will do!
    Ok now I feel really ignorant! I'm probably the only member who had no clue what truly this subject was about!

    I guess all my years around diesel engines & other diesel owners - This subject was never talked about or was it brought up in conversation. I guess my concerns were directed towards different issues...

    For others who didn't know - don't admit it... Here is what I found.



    Learning something new everyday.. Thank You CDF

    2017 Bighorn (Delmonico Red & Chrome) CC-HD2500-4WD-6.7L-3:42w/Anti-Spin
    Oil: -SHELL- Rotella T6 5W-40 & T5 15W-40 combo w/LF16035
    68RFE/BW44-46/Power Steering: -Red Line- C+ ATF
    Frontend & Rearend: -Red Line- SAE GL-5 75W-90NS
    Many Small Mods: Interior & Exterior
    Mileage: 28,541

  15. Top Of Page | #9
    BlackBart's Avatar

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    Re: Help Me Better Understand About a Runaway Diesel

    Quote Originally Posted by SyN View Post
    Ok - will do!
    Ok now I feel really ignorant! I'm probably the only member who had no clue what truly this subject was about!

    I guess all my years around diesel engines & other diesel owners - This subject was never talked about or was it brought up in conversation. I guess my concerns were directed towards different issues...

    For others who didn't know - don't admit it... Here is what I found.



    Learning something new everyday.. Thank You CDF

    Yup... mostly the screamin demons, aKA 2 stroke Detroits that did that

    Here it is on a 4-53




    Good stuff.... Truckers bring it

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  17. Top Of Page | #10
    BrentM's Avatar

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    Re: Help Me Better Understand About a Runaway Diesel

    I remember having emergency shut off levers on my Dad's boat that had Detroit 671's.

    Never had to use them but they were there and they worked.

    We tested them every once in a while.

    They activated a flap that shut off the air into the engine.

    Brent
    2017 Ram 2500 Limited / 6.7 / 68RFE / BDS 8" Lift / 38 x 13.5 Trail Grapplers / 20 x 10 Hostile Wheels
    2020 Ram 2500 Tradesman / 6.7 / 68RFE
    1993 W250 LE / 5.9 12V / G360 - 5 Speed


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