Interstate-McBee M-3963991 VGT Turbo Coolant Line Sealing Washer – 07.5–18 6.7L Cummins

OEM-style sealing washer for the turbocharger coolant line banjo bolts on 2007.5–2018 Ram 2500/3500/4500/5500 6.7L Cummins. Interstate-McBee’s M-3963991 matches OEM dimensions for reliable, leak-free service. Sold individually; typical full replacement uses 8 washers (two per banjo bolt).

• Direct-fit replacement: Matches Cummins 3963991 specifications for VGT turbo coolant line banjo connections.
• Correct sizing: 16 mm ID × 27 mm OD × 1.52 mm thickness for proper crush and seal.
• Aftermarket value: Interstate-McBee quality at a fraction of OEM cost.
• Sold individually: Order the quantity you need (commonly 8 for a complete job).

Specifications

What’s Included

• (1) Sealing washer, M-3963991 (order quantity as needed)

Vehicle Fitment

Always verify with engine serial number (ESN) for edge cases.

• Ram 2500/3500/4500/5500 with 6.7L Cummins ISB:
  • Model Years: 2007.5–2018

Install Notes

• Do not reuse old crush washers. Replace both sides of each banjo fitting (2 per bolt).
• Typical system uses four banjo joints (inlet/outlet at turbo and opposite ends) for a total of about 8 washers.
• Clean mating surfaces and torque banjo bolts to spec per the Cummins service manual.
• Check for leaks after warm-up and cool-down cycles; re-torque if manual specifies.

Warranty

Interstate-McBee new parts carry manufacturer warranty coverage. Contact us for current terms and assistance with claims.

Why Buy From CPP Diesel

• ESN-verified fitment support from diesel specialists
• Fast shipping and easy returns
• Curated Cummins parts catalog to complete the repair

FAQ