Product Description
CUMMINS 3904849 OEM TIMING PIN RETAINING RING – RAM 5.9L (1989–1998)
The genuine CUMMINS 3904849 OEM Timing Pin Retaining Ring is the small but critical clip that secures the factory pump timing pin on 5.9L Cummins engines. Whether you are performing VE rotary pump timing or P7100 (P-pump) timing adjustments, this retaining ring keeps the pin properly positioned during the procedure and prevents accidental loss. If your timing pin assembly is loose, missing hardware, or has seen years of vibration, replacing the clip helps restore factory-correct timing function and reliability.
This ring installs directly onto the Cummins timing pin assembly and is commonly used on 1989–1998 5.9L 12-valve engines. It works with the factory timing cover components and ensures the pin stays secured when locating TDC or performing pump timing procedures. Pair this with a fresh timing pin for accurate work on VE or P7100-equipped trucks.
Key Features
- Genuine Cummins OEM retaining ring – correct material and dimensions for timing accuracy.
- Required for proper VE and P7100 pump timing procedures.
- Direct-fit replacement for worn, missing, or weakened timing pin hardware.
- Durable spring-steel design ensures years of secure retention.
- Restores factory TDC location function on all 1989–1998 12-valve Cummins engines.
Fitment Details
- Engine: 5.9L Cummins B-Series 12-Valve (VE pump 1989–1993, P7100 1994–1998)
- Years: 1989–1998
- Vehicles: Dodge Ram 2500/3500 with 5.9L Cummins
- Function: Secures the injection pump timing pin assembly
Verify fitment by VIN/ESN for engines using non-standard timing covers or mixed components.
Cross-Reference & Companion Cummins Parts
These Cummins components pair with or support the 3904849 retaining ring:
- CUMMINS 3931630 OEM TIMING PIN – 5.9L CUMMINS
- CUMMINS 3904048 FRONT TIMING COVER SEAL
- VIEW ALL GENUINE CUMMINS PARTS
Common Cummins cross references: 3904849, 3904849-0, 3931630 (timing pin assembly mate).
Installation Notes
- Inspect timing pin for wear; replace if mushroomed or sticking.
- Ensure pin recess and cover area are clean before installing clip.
- Verify clip is fully seated to avoid inaccurate timing during pump adjustments.
- Works with both VE and P7100 pump timing procedures.
Specifications for cummins 3904849
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3904849 |
| Function | Injection pump timing pin retaining ring |
| Engine Compatibility | 5.9L Cummins B-Series 12-Valve (VE & P7100), 1989–1998 |
| Vehicle Fitment | 1989–1998 Dodge Ram 2500/3500 with 5.9L Cummins |
| UPC | 193464017422 |
| GTIN | 193464017422 |
| Cross Reference | 3904849-0, 3931630 (timing pin) |
| E-Codes / Emissions | Non-emissions-critical hardware |
| Shipping Weight | Less than 0.1 lb |
| Typical Shipping Method | Standard ground; ships small parcel |
| Prop 65 Warning | WARNING: May contain materials known to the State of California to cause cancer or reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins |
Frequently Asked Questions
WHAT DOES THE CUMMINS 3904849 RETAINING RING DO?
It secures the factory timing pin in place so accurate VE or P7100 pump timing can be performed without the pin backing out or becoming dislodged.
DOES THIS FIT BOTH VE AND P7100 ENGINES?
Yes. The clip is used on 1989–1998 engines equipped with either the VE rotary pump or the P7100 inline pump.
SHOULD I REPLACE THE TIMING PIN TOO?
If the pin is sticking, worn, mushroomed, or missing its spring tension, replace it with the CUMMINS 3931630 OEM TIMING PIN.
IS THIS A GENUINE CUMMINS PART?
Yes. CPP Diesel supplies only 100% genuine Cummins OEM components for this timing hardware.
CAN I TIME MY PUMP WITHOUT THIS RING?
It is not recommended. A missing or weak retaining ring can cause inaccurate timing or allow the pin to fall out during the procedure.
