Product Description
Interstate-McBee M-3920691 — Piston Wrist Pin Retaining Ring (Circlip) — 1994–2007 5.9L Cummins
OE-style piston wrist pin retaining ring (circlip) for the 5.9L Cummins (12-valve & 24-valve) used in 1994–2007 Dodge Ram 2500/3500. Retains the wrist pin securely within the piston. Sold individually.
- Direct replacement: Matches OE form, fit, and function.
- Durable construction: Spring-steel ring for reliable retention under heat and load.
- Service-ready: Ideal for piston/rod refreshes or full overhauls.
- Value: Interstate-McBee quality at an aftermarket price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3920691 |
| OEM Reference | Cummins 3920691 |
| Component | Piston wrist pin retaining ring (circlip) |
| Sold As | Each (1 ring) |
| Qty Required (per engine) | 12 rings (2 per piston × 6 pistons) |
What’s Included
- (1) Wrist pin retaining ring, P/N M-3920691
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 — 5.9L Cummins
- 12-Valve: 1994–1998
- 24-Valve: 1998.5–2007
- Other B-Series applications where Cummins 3920691 is specified (confirm by ESN).
Recommended/Related Parts
- Piston wrist pin (gudgeon pin)
- Pistons & ring sets
- Connecting rod bushings
- Piston cooling nozzles & hardware
- Head gasket set / overhaul gasket set
Install Notes
- Use clean, undamaged grooves; do not reuse old circlips.
- Install with suitable circlip pliers; make sure the ring fully seats in the groove.
- Position ring openings per service manual guidance; verify free rotation of the wrist pin.
- Work one piston at a time and follow the Cummins service procedures for orientation and torque specs.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping & easy returns
- Deep inventory of complementary Cummins 5.9L components
FAQ
How many retaining rings does my 5.9L need?
Each piston uses two rings (one on each side of the wrist pin). A complete engine requires 12 rings.
Are these sold as a pair?
No—this listing is for one (1) ring. Add the quantity you need to your cart.
Will this fit both 12-valve and 24-valve 5.9L engines?
Yes—this part number covers 1994–1998 12-valve and 1998.5–2007 24-valve applications. Verify by ESN for edge cases.
