Product Description
Genuine Cummins
Cummins 3903924 — Engine Timing Pin (TDC Locator)
MPN: 3903924 | Also Known As: timing pin, TDC pin | Cross-Refs/Related: 3902627; Interstate-McBee M-3903924; PAI 042013; O-ring 3913994 (sold separately)
Why This Part
- ✓ OE precision for accurate Top Dead Center (TDC) location on B-Series 12-valve engines.
- ✓ Direct-fit replacement per Cummins spec; O-ring sold separately.
- ✓ Prevents timing errors during pump/gear service and engine setup.
- ✓ Durable OEM construction for repeatable use.
OE Fit Service Tool 1 Per Engine
Quick Specs
| Type | Engine timing/TDC locating pin |
|---|---|
| OE Part # | 3903924 |
| Cross-References | 3902627; Interstate-McBee M-3903924; PAI 042013 |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L 12-Valve B-Series (VE/P7100) | Dodge Ram 2500/3500 |
Industrial/Off-Highway: Common across 4B/6B/6C and select ISC/ISL applications—verify by ESN before ordering.
Often Paired With
- Timing Pin O-Ring: 3913994
- Retaining Ring: 3904849
- Timing Pin Housing: 3919683
- Housing Seal: 3915772
What’s In The Box
- (1) Genuine Cummins Timing Pin (3903924)
- O-ring and hardware sold separately (see “Often Paired With”).
Install Tips
- Always install with a new O-ring (3913994); lightly lube before insertion.
- Set engine to service position per Cummins procedure and verify pin seating.
- Avoid over-tightening; inspect housing and seal if leakage is observed.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE RAM?Yes—XDP lists 3903924 for 1989–1998 Dodge with 5.9L Cummins. Verify by VIN/ESN if components have been changed.
DOES THE TIMING PIN INCLUDE THE O-RING?No—the O-ring (3913994) is sold separately and should be replaced during service.
WHAT DOES THIS PART DO?It precisely locates Top Dead Center (TDC) to set/verify injection pump and gear timing on 12-valve B-Series engines.
ARE THERE CROSS-REFERENCE NUMBERS?Yes—common cross-refs include 3902627, Interstate-McBee M-3903924, and PAI 042013.
IS THIS A GENUINE CUMMINS PART?Yes—this is an OEM Cummins timing pin for accurate, repeatable service work.
