Product Description
Cummins 3934047 — Piston Wrist Pin (Gudgeon Pin)
MPN: 3934047 | Also Known As: wrist pin, piston pin, gudgeon pin | Cross-Refs: 3919053
Why This Part
- ✓ OE steel and finish for correct clearance and durability.
- ✓ Direct-fit on late 5.9L ISB applications (see fitment below).
- ✓ Restores proper piston-to-rod connection and quiet operation.
- ✓ Genuine Cummins quality for long service life.
Quick Specs
| Type | Piston wrist pin (full-floating) |
|---|---|
| OE Part # | 3934047 (cross-ref 3919053) |
| Qty Required | 6 per engine (sold individually) |
| Includes | Pin only — retainer clips sold separately |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2004.5–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
Compatibility Notes: Cummins indicates this pin is used primarily on BS3/Euro 3 5.9L B-series engines. Earlier 5.9L (1994–2007) builds may use different pins depending on piston design. Please verify by piston part number or ESN before ordering.
Often Paired With
- Wrist pin retaining clips: Cummins 3920691 — 2 required per piston, 12 per engine
- Piston assemblies/rings: varies by ESN and bore
- Rod small-end bushing service: inspect/replace if out of spec
What’s In The Box
- (1) Genuine Cummins Piston Wrist Pin (3934047)
- Retaining clips sold separately (see “Often Paired With”).
Install Tips
- Always install new retaining clips; do not reuse.
- Measure pistons/rods and pin bores; verify clearances per Cummins specs.
- Lubricate pin and bores during assembly; align per piston manufacturer’s guidance.
FAQ
WILL THIS FIT MY 2004.5–2007 5.9L CUMMINS RAM?Yes—this is the OE wrist pin for many late 5.9L ISB (’04.5–’07) builds. Always confirm by ESN or piston part number.
HOW MANY PINS AND CLIPS DO I NEED?Six pins per engine (one per piston). Each piston uses two retaining clips (12 clips total).
DOES THIS INCLUDE THE RETAINING CLIPS?No—the clips are separate; common OE clip is Cummins 3920691 (2 per piston).
WHAT IF MY TRUCK IS EARLIER THAN 2004.5?Earlier 5.9L builds may use different pins based on piston design. Verify by ESN and piston part number before ordering.
IS THIS A GENUINE CUMMINS PART?Yes—this is an OEM Cummins wrist pin (3934047).
