Product Description
INTERSTATE-MCBEE M-4955860 MAIN BEARING SET .010 – 1989–2018 5.9L / 6.7L CUMMINS
Quality aftermarket replacement main bearing set for Cummins B-Series 5.9L and 6.7L engines. This set is .010" undersize (approx. 0.25 mm) for use after crankshaft regrind. Designed for OE-equivalent fit and reliable bottom-end service.
- Application: 1989–2018 Cummins B-Series (Dodge Ram / Ram 2500–5500, ISB/6BT)
- Undersize: .010" (0.25 mm) on journal
- Direct replacement: Installs in the factory main saddles and caps
- Service use: Ideal for freshen-ups and full rebuilds after crank machining
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4955860 |
| Description | Main Bearing Set, .010" (0.25 mm) undersize |
| Engine Family | Cummins 5.9L (6BT/ISB) & 6.7L (ISB) |
| Model Years | 1989–2018 (verify by ESN) |
| Sold As | Complete set for all main journals |
What’s Included
- (1) Complete main bearing set for all mains (upper & lower shells)
- Thrust bearing components as required by application
Vehicle / Engine Fitment
Always confirm with your engine serial number (ESN) and crankshaft grind size before ordering.
- 5.9L Cummins (6BT / ISB)
- 1989–1998 12-Valve 5.9L (Dodge Ram 2500/3500)
- 1998.5–2002 24-Valve 5.9L (VP44)
- 2003–2007 24-Valve 5.9L (Common-Rail)
- 6.7L Cummins (ISB)
- 2007.5–2018 Ram 2500/3500/4500/5500 6.7L ISB
Install Notes
- Confirm crankshaft journal size is ground to .010" (0.25 mm) undersize.
- Cleanliness is critical—degrease, blow out oil passages, and pre-lube bearings.
- Check bearing crush and oil clearance using Plastigage or micrometer measurements.
- Align bearing oil holes/notches with block and cap passages; observe upper vs. lower shell positions.
- Torque main cap fasteners per Cummins service manual; verify crankshaft endplay after thrust installation.
Why Buy From CPP Diesel
- Diesel-specialist support with ESN verification
- Fast shipping and competitive pricing
- Deep inventory of matching rod bearings, gaskets, and hardware
FAQ
What does “.010 undersize” mean?
It means the crankshaft main journals have been ground .010" smaller than stock. You must use .010" undersize bearings to restore correct oil clearance.
Will this fit both 5.9L and 6.7L Cummins?
Yes—this set covers B-Series 5.9L and 6.7L ISB engines through 2018. Always verify by ESN and journal size.
Does this include the thrust bearings?
Yes, the set includes the thrust bearing components required for the application.
Can I use these on a standard (non-ground) crank?
No. For a standard crank, order the standard-size main bearing set. Undersize bearings are only for reground journals.
