Product Description
The Cummins 4955855 OEM Main Bearing Set (Standard) is a genuine Cummins engine rebuild component engineered for 5.9L & 6.7L B-Series engines used in Dodge/Ram trucks from 1989–2018. Designed for precise oil clearance, exceptional wear resistance, and long crankshaft life, these bearings deliver OE-level performance for stock, towing, agricultural, industrial, and high-load applications. Unlike aftermarket bearings, this genuine Cummins set guarantees exact metallurgy, crush fit, and durability that meet Cummins’ stringent B-Series specifications.
Whether you are overhauling a 12-Valve 5.9L, a VP44-era ISB, a common-rail 5.9L, or a 6.7L Cummins, 4955855 provides the correct standard-size main bearings required for a dependable long-life bottom-end build.
Fitment
- 1989–1998 5.9L 12-Valve Cummins (VE & P-pump engines)
- 1998.5–2002 5.9L 24-Valve ISB Cummins (VP44)
- 2003–2007 5.9L Common Rail Cummins
- 2007.5–2018 6.7L Cummins (Common Rail)
- Standard-size crankshaft main bearing journals
Note: Always verify that your crankshaft journals measure within standard specifications before installing standard-size bearings.
Cross-Reference (Cummins-Only)
These parts are commonly replaced during a bottom-end or full engine overhaul:
• Cummins 3900267 OEM Tappet Cover Bolt Grommet Seal
• Cummins 3903924 OEM Timing Pin
• Cummins 3904409 OEM Valve Stem Guide
FAQ
Are these Cummins 4955855 bearings standard size?
Yes. This set contains standard-size main bearings for B-Series crankshafts that have not been machined undersize.
Do these bearings fit both 5.9L and 6.7L Cummins engines?
Yes — the 4955855 set supports 1989–2018 5.9L and 6.7L Cummins engines across VE, P-pump, VP44, and common-rail configurations.
Should I replace thrust bearings at the same time?
Yes. Cummins recommends replacing main and thrust bearings together during any bottom-end rebuild for optimal crankshaft alignment.
How do I verify if I need undersize bearings instead?
Measure crankshaft main journals with a micrometer. If journals are machined undersize, you will require undersize bearings, not standard.
Specifications for cummins 4955855
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 4955855 |
| Component Type | Main Bearing Set – Standard Size |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Fits standard-size crank journals for all 5.9L & 6.7L Cummins B-Series engines |
| E-Codes | Not Applicable |
| Shipping Weight | 2.0 lbs (approx.) |
| Package Dimensions | 6 x 4 x 2 in |
| Prop 65 Warning | Not Applicable |
