Product Description
Genuine Cummins
Cummins 3920691 — Piston Pin Retaining Ring / Wrist Pin Clip
MPN: 3920691 | Also Known As: wrist pin clip, piston pin retainer, circlip | Sold: Individually (2 clips per piston, 12 per engine)
Why This Part
- ✓ OE retaining ring that locks the wrist pin in the piston.
- ✓ Direct-fit for 5.9L B-Series Cummins across 1989–2007 (verify by VIN/ESN).
- ✓ Hardened spring steel for reliable groove retention at high RPM/load.
- ✓ Perfect for refreshes, rebuilds, and preventative service.
OE Fit Sold Individually 12 Per Engine
Quick Specs
| Type | Wrist pin retaining ring (piston pin circlip) |
|---|---|
| OE Part # | 3920691 |
| Qty Required | 2 clips per piston (12 total per 6-cyl engine) |
| Material | Hardened spring steel |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–2002 | Ram 5.9L ISB/6BT (12V & 24V) | Ram 2500/3500 |
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: Used primarily on Euro 3 B-Series 5.9L applications; always confirm by ESN.
Often Paired With
- Wrist Pins: 3934048 (’94–’02 5.9L) · 3934047 (’04.5–’07 5.9L)
- Pistons/Rings: match to engine year & bowl design
- Assembly Lube: for wrist pin/bushing during install
What’s In The Box
- (1) Genuine Cummins Wrist Pin Retaining Ring (3920691)
- Order quantity 2 per piston (12 per engine)
Install Tips
- Always use new clips—do not reuse old circlips.
- Seat fully in the piston groove; confirm free rotation of the wrist pin.
- Cover the crankcase during install to prevent dropping the clip inside.
FAQ
WILL THIS FIT MY 1989–2007 5.9L CUMMINS RAM?Yes—this OE clip is used across 5.9L B-Series applications from 1989–2007 (verify by VIN/ESN).
HOW MANY CLIPS DO I NEED?You need 2 clips per piston—that’s 12 clips per engine on a 6-cyl 5.9L.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins part 3920691.
WHAT ARE THE MATCHING WRIST PINS?Common matches include 3934048 (’94–’02) and 3934047 (’04.5–’07). Always confirm by VIN/ESN.
WILL THIS WORK ON 6.7L?This listing targets 5.9L. Some Euro 3 B-Series/industrial applications differ—verify by ESN for 6.7L.
Product Videos
Custom Field
Vehicle Year 1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007
Vehicle Make DODGE
ENGINE 5.9L
