Product Description
INTERSTATE-MCBEE M-4891178 CONNECTING ROD END BUSHING — 1994–2018 5.9L / 6.7L CUMMINS
Aftermarket replacement small-end (wrist-pin) bushing for Cummins B-Series connecting rods. Precision-machined for press-fit installation and finish-sizing after install. Sold individually.
- Direct replacement: Replaces Cummins ref. 4891178 for B-Series applications.
- Durable construction: Engineered for long service in high-load diesel duty cycles.
- Service-friendly: Designed to be pressed into the rod and then honed/reamed to final pin clearance.
- Quality you can trust: Interstate-McBee aftermarket component for OE-equivalent fit and function.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4891178 |
| OEM Reference | Cummins 4891178 |
| Component | Connecting Rod Small-End (Wrist-Pin) Bushing |
| Sold As | Each (1 bushing) |
| Qty Required | 6 per engine (one per connecting rod) |
| Finish | Must be sized (honed/reamed) to pin clearance after installation |
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Cummins 5.9L & 6.7L B-Series (Dodge Ram 2500/3500 and other applications)
- Model Years: 1994–2018
- Engines: 5.9L 12-Valve (1994–1998), 5.9L 24-Valve (1998.5–2007), 6.7L (2007.5–2018)
What’s Included
- (1) Connecting rod small-end bushing, P/N M-4891178
Install Notes
- This is a press-fit bushing. After pressing into the rod, finish-size the I.D. (hone/ream) to the correct wrist-pin clearance per the service manual.
- Align any oil feed hole in the bushing with the rod’s oil passage during install.
- Use proper support and mandrels to avoid rod distortion; measure for roundness and pin bore centerline.
Recommended Service Parts
- Wrist pins (standard size) for your piston set
- New connecting rod bolts/nuts (torque-to-yield where applicable)
- Engine assembly lube and measurement tools (dial bore gauge / pin mic)
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping and easy returns
- Deep inventory of Cummins B-Series internal engine parts
FAQ
Does this fit my 5.9L or 6.7L Cummins?
Yes. This bushing replaces Cummins 4891178 for 1994–2018 5.9L/6.7L B-Series applications. For certain engine builds or rod variants, verify by ESN.
How many do I need?
Six per engine (one per connecting rod).
Do I need machine work after pressing the bushing?
Yes. These bushings are intentionally finished to allow final sizing after installation. Hone/ream to achieve the correct wrist-pin clearance and finish.
Is this for standard wrist-pin size?
It is intended for standard wrist-pin size with final sizing performed during installation. If you are using oversized pins or aftermarket rods, confirm dimensions before ordering.
