Product Description
Cummins 4955856 OEM Main Bearing Set (.010) 5.9L / 6.7L Cummins 1989-2018
The Cummins 4955856 OEM Main Bearing Set (.010) is a genuine Cummins replacement bearing set designed for 5.9L and 6.7L Cummins diesel engines from 1989 through 2018. Manufactured to Cummins' exact specifications, this undersize main bearing set provides the precision fit, durability, and oil control required during engine rebuilds where the crankshaft journals have been machined .010 inch undersize.
Whether you're rebuilding a 12-valve, 24-valve, Common Rail, or 6.7L Cummins engine, the 4955856 main bearing set delivers OEM-quality performance and long-term reliability. Genuine Cummins bearings are engineered to maintain proper oil clearance, support heavy loads, and withstand the extreme operating conditions common in diesel-powered trucks, towing applications, and performance builds.
Features
- Genuine Cummins OEM main bearing set
- .010 inch undersize bearing specification
- Designed for crankshafts machined .010 inch under standard size
- Precision manufactured for proper oil clearance
- OEM-quality materials and construction
- Excellent durability under heavy load conditions
- Ideal for complete engine rebuilds and overhauls
- Supports proper crankshaft alignment and lubrication
- Trusted Cummins factory replacement component
- Designed for long service life and reliability
Fitment
- 1989-1998 Dodge Ram 5.9L Cummins 12-Valve
- 1998.5-2002 Dodge Ram 5.9L Cummins 24-Valve
- 2003-2007 Dodge Ram 5.9L Cummins Common Rail
- 2007.5-2018 Ram 6.7L Cummins
- Industrial and commercial Cummins B-Series applications
- Engine rebuilds utilizing a crankshaft machined .010 inch undersize
Note: This is a .010 inch undersize main bearing set and is intended for use with crankshafts that have been machined .010 inch below standard journal dimensions. Always verify crankshaft measurements and bearing clearances before installation.
What's Included
- Cummins 4955856 Main Bearing Set (.010)
- Upper and lower main bearing shells
- Complete set for one engine rebuild
Specifications
- Manufacturer: Cummins
- Part Number: 4955856
- Product Type: Main Bearing Set
- Bearing Size: .010 Inch Undersize
- Engine Compatibility: 5.9L and 6.7L Cummins B-Series Engines
- Fitment Years: 1989-2018
- Material: OEM Cummins Bearing Material
- Application: Engine Rebuild and Overhaul
- Installation Requirement: Crankshaft Machined .010 Inch Undersize
- OEM Replacement: Yes
Cross Reference Numbers
4955856, Cummins 4955856, 4955856-010, .010 Main Bearing Set, 5.9 Cummins Main Bearings, 6.7 Cummins Main Bearings
FAQ
What does .010 undersize mean?
A .010 undersize bearing is designed for use with a crankshaft that has been machined .010 inch below the original factory journal diameter during an engine rebuild.
Will this fit both 5.9L and 6.7L Cummins engines?
Yes. The Cummins 4955856 bearing set is designed for B-Series 5.9L and 6.7L Cummins engines when the crankshaft has been machined .010 inch undersize.
Can I use these bearings on a standard crankshaft?
No. These bearings are specifically designed for a crankshaft that has been machined .010 inch under standard size. Standard crankshafts require standard-size bearings.
Why choose genuine Cummins bearings?
Genuine Cummins bearings are manufactured to OEM specifications and provide the proper oil clearance, durability, and reliability required for long engine life.
Are these bearings suitable for performance applications?
Yes. Genuine Cummins bearings are commonly used in stock, towing, heavy-duty, and performance diesel engine builds when proper machining and bearing clearances are maintained.
