Product Description
Interstate-McBee M-3940059 Cam Bearing – Storm Block / CR 5.9L & 6.7L Cummins (Aftermarket Replacement)
Quality replacement camshaft bearing for Cummins B-Series Storm Block / Common-Rail engines. Built to OE form, fit, and function for durable support of the camshaft under high load and oil-film conditions. Sold individually.
- Direct replacement: Matches the OE geometry and oiling features for reliable performance.
- Engineered materials: Bearing alloy construction for wear resistance and proper embedability.
- Service friendly: Compatible with standard cam bearing installation tools.
- Value: Interstate-McBee quality at an excellent price point.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3940059 |
| OEM Reference | Cummins 3940059 |
| Engine Family | Cummins B-Series 5.9L / 6.7L (Storm Block / Common-Rail) |
| Position | Camshaft bearing |
| Material | Bearing alloy (tri-metal) |
| Sold As | Each (1 bearing) |
| Packaging | Aftermarket replacement |
What’s Included
- (1) Cam bearing, P/N M-3940059
Vehicle / Engine Fitment
Always verify by engine serial number (ESN) and parts catalog before ordering.
- Cummins B-Series Storm Block / Common-Rail applications (approx. 1997.5–2018), including:
- 5.9L CR: typically 2003–2007 applications
- 6.7L CR: typically 2007.5–2018 applications
- Use where Cummins 3940059 is specified.
Install Notes
- Use a dedicated cam bearing driver. Do not hammer directly on the bearing.
- Align oil holes precisely with block passages; verify orientation before final seating.
- Lubricate bearing ID and cam journals during assembly; check oil clearance to spec.
- Inspect camshaft for wear, scoring, and runout. Replace if out of spec.
- Clean all galleries and follow the Cummins service manual procedures and torque values.
Recommended/Related Parts
- Camshaft (matching profile for your application)
- Thrust plate / retainer hardware
- Front and rear main seals, timing cover gasket
- Oil pump and pickup tube seals (inspect while accessible)
FAQ
How many cam bearings do I need?
Quantity can vary by engine build. This listing is for one bearing (sold individually). Check your ESN and parts diagram to determine total count and positions.
Do I need machine work?
Not typically if the block bores are round and in spec. If there’s bore damage or misalignment, line-boring/honing may be required. Measure before assembly.
Will this fit my truck?
If your B-Series Storm Block / Common-Rail engine calls for Cummins 3940059, this bearing is the correct replacement. Verify by ESN for certainty.
Why Buy From CPP Diesel
- ESN-verified fitment help from diesel specialists
- Fast shipping and easy returns
- Deep catalog of Cummins B-Series valvetrain and bottom-end parts
