Product Description
Interstate-McBee M-4955856 Main Bearing Set .010" (0.25 mm) Oversize – 1989–2018 5.9L/6.7L Cummins
Premium replacement main bearing set for the Cummins B-Series 5.9L (12V & 24V) and 6.7L ISB engines. This kit is sized .010" (0.25 mm) undersize on the crankshaft journals and is intended for use after crankshaft regrind. Interstate-McBee bearings are manufactured to OE-equivalent materials and clearances for long service life.
- Application: 1989–2018 Cummins 5.9L/6.7L B-Series (Dodge/Ram 2500/3500 & industrial variants)
- Size: .010" / 0.25 mm undersize (crankshaft ground .010")
- Complete set: Upper & lower shells for all main journals, plus thrust bearing
- Quality: Interstate-McBee aftermarket replacement for dependable OE-style fit and performance
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4955856 |
| Bearing Size | .010" (0.25 mm) undersize on crank journals |
| Engine Platforms | Cummins 5.9L 12-Valve & 24-Valve (1989–2007), Cummins 6.7L ISB (2007.5–2018) |
| Positions | Complete main set with thrust bearing |
| Sold As | Set (service one engine) |
What’s Included
- (1) Complete main bearing set, .010" (0.25 mm) undersize
- (1) Thrust bearing assembly
Vehicle/Engine Fitment
Always verify size and fitment by Engine Serial Number (ESN) and crankshaft grind spec.
- Dodge/Ram 2500 & 3500 with 5.9L Cummins (1989–2007)
- Dodge/Ram 2500 & 3500 with 6.7L Cummins (2007.5–2018)
- Additional Cummins B-Series/ISB on-highway, agricultural, and industrial applications where .010" undersize is specified
Install Notes
- This set is for crankshafts reground to .010" (0.25 mm) undersize. Do not install on a standard-size crank.
- Measure journal diameters and bearing clearances (plastigage or mic/ID bore gauge). Follow Cummins service specifications for oil clearance and thrust endplay.
- Clean oil passages thoroughly; use assembly lube on installation and torque main caps in sequence.
- After install, prime the oil system and verify oil pressure on first start.
Common Companion Parts
- Rod bearing set (match oversize to crank regrind)
- Main bolt or stud kit (replace TTY hardware as required)
- Full gasket set / bottom-end gasket set
- Oil pump and pickup tube seal
Why Buy From CPP Diesel
- Diesel-focused support with ESN verification help
- Fast shipping and competitive pricing on Interstate-McBee components
- One-stop shop for related Cummins B-Series rebuild parts
FAQ
Is this the correct size for my engine?
This set is .010" (0.25 mm) undersize for use after a crankshaft regrind. Check your machine shop slip or measure the journals to confirm.
Does this include the thrust bearing?
Yes, the thrust bearing is included with this complete main set.
Will this fit both 5.9L and 6.7L Cummins?
Yes—this listing covers B-Series 5.9L (1989–2007) and 6.7L ISB (2007.5–2018), provided the crank is ground to .010" undersize. Always verify by ESN.
Do I need standard or oversize bearings?
Use standard bearings on an unground crankshaft. Use oversize (undersize on journal) bearings like this set after the crank has been reground to the matching size.
