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Thread: 2012 RAM 3500 - Coolant Leak?

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    Gsxrgrizz's Avatar

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    2012 RAM 3500 - Coolant Leak?

    I discovered a large standpipe coolant leak on my Sinister EGR delete hose.

    Does anyone know what size o-ring I need so I can try to temporarily stop it until I can figure out a more permanent solution?

    I’m in Canada, and it’s Thanksgiving Sunday; no one is open.

    The only practical use for that pistol is to fight your way back to the rifle you should not have dropped in the first place!!

    2012 Ram 3500 6.7 HO Black QC SB - Full EGR/DPF Delete, 4" Flow Pro Turbo Back - FASS Titanium 150 with sump and fuel heater - Awesome Double R Tune

  2. Thanks Corkey, AK Bob, IGOTACUMMINS thanked for this post
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    I WILL STAND! AK Bob's Avatar

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    Re: 2012 RAM 3500 - Coolant Leak?

    The O ring you need is the "Viton" Cummins P/N CUM5266152.

    The dimensions are OD: 1 1/64" (1.056), ID: 3/4" (.75), Thickness: 9/64" (.1406).

    The closest size match I could come up with is the Danco #210.

    See the chart attached.

    The green Vitron material is highly recommended.

    https://yardandgardenguru.com/danco-o-ring-sizes-chart/

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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    Gsxrgrizz's Avatar

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    Re: 2012 RAM 3500 - Coolant Leak?

    Wow, Bob, I’m not sure what I’m more impressed over, your knowledge of o-rings or the fact you took the time to provide all that data for me!

    Thanks a lot; this is what makes this forum awesome!!

    The only practical use for that pistol is to fight your way back to the rifle you should not have dropped in the first place!!

    2012 Ram 3500 6.7 HO Black QC SB - Full EGR/DPF Delete, 4" Flow Pro Turbo Back - FASS Titanium 150 with sump and fuel heater - Awesome Double R Tune

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