Product Description
Interstate-McBee M-4891178 Connecting Rod End (Wrist-Pin) Bushing – 94–18 5.9L/6.7L Cummins
Direct-fit aftermarket wrist-pin bushing for Cummins B-Series 5.9L (ISB) and 6.7L (ISB) applications. The M-4891178 bushing restores proper pin-to-rod clearance, reduces friction, and supports long service life on 1994–2007 5.9L and 2007.5–2018 6.7L Dodge Ram 2500/3500 trucks and other B-Series platforms. Sold individually; six (6) required per engine.
- OEM-style fit and function: Aftermarket replacement for Cummins 4891178.
- Precision sizing: Press-in installation; final hone/ream to spec per Cummins service manual.
- Engineered for durability: Supports proper lubrication and pin alignment under heavy-duty use.
- Value vs. OEM: Interstate-McBee quality at a lower cost than genuine Cummins boxed parts.
Specifications
| Interstate-McBee Part | M-4891178 |
|---|---|
| OEM Cross-Reference | 4891178 (Cummins) |
| Additional Interchanges | 3901085, 3941476 (verify by ESN) |
| Position | Connecting rod small-end (wrist-pin) bushing |
| Sold As | Each (six required per engine) |
Vehicle Fitment
Always confirm by engine serial number (ESN) and connecting-rod style; some early designs vary by oil-hole orientation.
- Dodge Ram 2500/3500 5.9L Cummins (ISB): 1994–2007
- Dodge Ram 2500/3500 6.7L Cummins (ISB): 2007.5–2018
- Also common on B-Series industrial/ag: 4B/4BT 3.9L, 6B/6BT 5.9L, ISB & QSB families (verify by ESN and rod).
Install Notes
- Press bushing into clean, inspected rod small-end; align oil feed if applicable.
- Hone/ream to wrist-pin clearance per Cummins spec; measure with proper gauges.
- Replace any out-of-round or damaged rods; follow torque and lube procedures in the Cummins manual.
Warranty
Interstate-McBee new engine parts generally carry up to 24 months coverage under normal use; valve-train items may vary. Contact us for the policy that applies to this bushing.
Why Buy From CPP Diesel
- ESN-verified fitment support from real diesel techs
- Fast shipping and hassle-free returns
- Huge B-Series selection to complete your rebuild
FAQ
Will M-4891178 fit both 5.9L and 6.7L Cummins?Yes—this bushing is widely used across Cummins B-Series ISB/QSB platforms, including 1994–2007 5.9L and 2007.5–2018 6.7L Ram applications. Always verify by ESN and rod design.
How many bushings do I need?
There is one bushing per cylinder—you’ll need six (6) for a complete 6-cyl engine.
Is machining required after pressing?
Yes. After pressing, the bushing should be honed or reamed to the final wrist-pin clearance per the Cummins service manual.
What are the OEM and interchange numbers?
Primary OEM reference is Cummins 4891178. Common interchanges include 3901085 and 3941476 (confirm by ESN).
Does this fit industrial B-Series (4B/6B, QSB)?
Frequently, yes—this bushing appears across 4B/4BT, 6B/6BT, ISB, and QSB engines. Verify by ESN, rod part number, and build spec.
Product Videos
Custom Field
YEAR 1994-2018
MAKE DODGE
ENGINE 5.9L,6.7L
