Product Description
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
| Brand / Part | Interstate-McBee M-3963991 |
|---|---|
| OEM Cross-Refs | Cummins 3963991, 4944257, 3957428 |
| Application | VGT turbocharger coolant line banjo bolt sealing washer |
| Dimensions | 16 mm ID × 27 mm OD × 1.52 mm thickness |
| Sold As | Each (individually) |
| Typical Qty Needed | 8 (2 washers per banjo bolt) |
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
How many washers do I need for a full replacement?Most setups require 8 washers total—two per banjo bolt across four connections. Always confirm your configuration.
Is M-3963991 equivalent to Cummins 3963991?
Yes. M-3963991 is an aftermarket, OEM-style replacement that crosses to Cummins 3963991 and related references like 4944257.
Will this fit 2019+ 6.7L trucks?
This listing targets 2007.5–2018. Later model years may differ. Verify by VIN/ESN or contact us for guidance.
What size is the washer?
16 mm inner diameter, 27 mm outer diameter, approximately 1.52 mm thickness.
Is this sold individually or in sets?
Sold individually so you can order exactly what you need.
Product Videos
Custom Field
YEAR 2007.5-2018
MAKE DODGE
ENGINE 6.7L
