Product Description
Interstate-McBee M-4955856 Main Bearing Set .010 (0.25mm) – 1989–2018 5.9L/6.7L Cummins
Restore proper oil clearance and crank stability with the Interstate-McBee M-4955856 .010" (0.25 mm) undersize main bearing set for 1989–2018 5.9L & 6.7L Cummins B-Series/ISB engines. Built to OEM-equivalent specs for reliable sealing films, quiet operation, and long service life.
- Correct undersize: .010" / 0.25 mm for cranks ground .010" under.
- OEM-style construction: Precision bearing shells for consistent oil film and heat transfer.
- Direct replacement: Aftermarket alternative to Cummins 4955856 set.
- Engineered fit: Designed for Cummins B/ISB platforms used in Dodge Ram trucks and industrial variants.
Specifications
| Brand / Part | Interstate-McBee M-4955856 |
|---|---|
| Size | .010" undersize (0.25 mm) |
| OEM Cross-Reference | Cummins 4955856 (main bearing set, .010) |
| Engine Family | Cummins B/ISB/ISBe/QSB 5.9L & 6.7L |
| Position | Crankshaft main bearings (upper/lower shells) |
| Includes | Main bearing shell set for all mains; thrust bearing typically sold separately |
| Finish / Coating | OEM-style tri-metal construction (application-dependent) |
Vehicle Fitment
Always verify by Engine Serial Number (ESN) and crank journal size after machining.
- Dodge Ram 2500/3500
- 1989–1998 5.9L 12-Valve (6BT)
- 1998.5–2002 5.9L 24-Valve (ISB)
- 2003–2007 5.9L Common Rail (ISB)
- 2007.5–2018 6.7L ISB
- Industrial / Agricultural / Marine: Select B / ISB / QSB variants where .010" undersize is specified.
Installation Notes
- Confirm crankshaft grind to .010" under on main journals; measure with micrometers.
- Clean block saddles and caps; check bearing crush and oil clearance (e.g., Plastigage).
- Follow Cummins service manual for torque/angle values and sequence; lubricate per spec.
- Replace thrust bearing if out of spec; verify crank end-play after assembly.
What’s Included
- (1) Main bearing shell set, .010" (0.25 mm) undersize for all mains
Note: Thrust bearing typically sold separately (common Cummins ref: 4938948; verify by ESN).
Warranty
Interstate-McBee new engine components include manufacturer warranty coverage. Terms vary by category—contact us for specific coverage on bearing sets.
Why Buy From CPP Diesel
- ESN-verified fitment support for B/ISB engines
- Fast shipping, easy returns, and real diesel techs on staff
- Bundling options with thrust bearing, main studs, and gasket kits
FAQ
What does .010" (0.25 mm) undersize mean?It matches a crankshaft that’s been ground .010" under OEM diameter. The undersize bearing restores correct oil clearance.
Will this fit both 5.9L and 6.7L Cummins?
Yes—this set is for B/ISB platforms used in 5.9L (1989–2007) and 6.7L (2007.5–2018) Cummins applications. Verify by ESN and journal size.
Is the thrust bearing included?
Typically, the thrust bearing is separate. We recommend inspecting and replacing it as needed; verify the correct part by ESN.
Do I need machine work to use .010" bearings?
Yes—.010" bearings are for cranks that have been professionally ground .010" under. Standard cranks use standard-size bearings.
