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INTERSTATE MCBEE

INTERSTATE-MCBEE M-3678603 TURBO OIL INLET O-RING 07.5–18 6.7L CUMMINS (AFTERMARKET REPLACEMENT)

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SKU:
MCBM-3678603
MPN:
M-3678603
Shipping:
Calculated at Checkout
$3.99
724-785-4022

Description

Interstate-McBee M-3678603 Turbo Oil Inlet O-Ring — 07.5–18 6.7L Cummins

OEM-style turbocharger oil inlet O-ring engineered by Interstate-McBee for 2007.5–2018 Ram 2500/3500 6.7L Cummins (ISB). Sized to OEM dimensions for a reliable seal at the turbo oil feed fitting, helping prevent leaks and pressure loss during service or turbo replacement.

  • Direct replacement: Matches Cummins 3678603 specifications.
  • Application-correct: Used on ISB/QSB 6.7 applications; ideal when servicing HE351VE/HE300VG feed fittings.
  • Right size, right fit: 0.366" ID × 0.087" C/S for proper groove compression.
  • Aftermarket value: Interstate-McBee quality at a lower cost vs OEM-boxed parts.

Specifications

Interstate-McBee Part M-3678603
OEM Cross-Ref Cummins 3678603
Function Turbocharger oil feed (inlet) O-ring
Nominal Size 0.366" ID × 0.087" cross-section
Fitting Context Common with M12×1.5 oil feed fitting assemblies
Warranty Interstate-McBee new engine parts warranty (up to 24 months)

What’s Included

  • (1) Turbo oil inlet O-ring (M-3678603)

Vehicle Fitment

Always verify by engine serial number (ESN) for edge-case builds.

  • Ram 2500/3500 6.7L Cummins (ISB)
    • Model Years: 2007.5–2018
  • Additional: Also used across ISB/QSB 6.7 platforms where Cummins 3678603 is specified.

Install Notes

  • Clean the fitting groove and seating surfaces thoroughly; remove all debris and old elastomer.
  • Lightly lubricate the new O-ring with clean engine oil; avoid twists during installation.
  • Torque oil feed fasteners per the Cummins service manual; check for leaks after first heat cycle.

Why Buy From CPP Diesel

  • Application-specific diesel inventory with expert ESN fitment support.
  • Fast shipping, easy returns, and knowledgeable customer service.
  • One-stop timing/turbo service parts: oil feed lines, fittings, gaskets, and seals.

FAQ

Will this O-ring fit my 2007.5–2018 6.7L Ram?
Yes—this Interstate-McBee M-3678603 matches Cummins 3678603 used on 6.7L ISB applications in 2007.5–2018 Ram 2500/3500. Verify by ESN if your setup has been modified.
Is this an OEM Cummins part?
This is an aftermarket Interstate-McBee part built to OEM-equivalent specs. If you need an OEM-boxed item, order Cummins 3678603.
What are the size specs?
Nominal dimensions are 0.366" inside diameter by 0.087" cross-section, correct for the turbo oil feed fitting groove.
Do I need sealant?
No sealant is used on O-rings. Lightly oil the O-ring and install per the Cummins service manual.
Signs the O-ring is failing?
Oil seepage at the turbo oil inlet, soft/flattened elastomer, or nicks/cuts after disassembly. Replace any time the fitting is removed.
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