Product Description
Cummins 3913994 — Timing Pin O-Ring (Front Cover / Timing Pin Housing Seal)
MPN: 3913994 | Also Known As: timing pin O-ring, timing cover pin seal | Pairs With: Timing Pin 3903924 & Housing 3919683
Why This Part
- ✓ OE sealing for the timing pin housing to prevent leaks at the front cover.
- ✓ Direct-fit for 1989–1998 5.9L 12-valve B-series (VE & P7100).
- ✓ Correct durometer & profile for reliable long-term sealing.
- ✓ Affordable, easy preventative service while timing components are apart.
Quick Specs
| Type | O-ring (timing pin housing seal) |
|---|---|
| OE Part # | 3913994 |
| Location | Front timing cover – timing pin housing |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive & Common Engines)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L B-Series 12V (VE & P7100) | Dodge/Ram 2500/3500 |
| 1989–1998 | 3.9L 4BT (industrial) | Various (verify by ESN) |
| 1989–1998 | 8.3L 6CT (industrial/MD) | Various (verify by ESN) |
Notes: Primarily for 12-valve B-series timing pin housings. For later 24V/CR engines, confirm by ESN and timing cover configuration.
Often Paired With
- Timing Pin: Cummins 3903924
- Timing Pin Housing: Cummins 3919683
- Retaining Ring: Cummins 3904849
- Housing Seal: Cummins 3915772
What’s In The Box
- (1) Genuine Cummins Timing Pin O-Ring (3913994)
- Timing pin & housing sold separately (see “Often Paired With”).
Install Tips
- Lightly oil the O-ring before installation to prevent nicks.
- Clean the timing cover bore and housing; inspect for burrs.
- Seat the housing squarely; verify no pinch or twist of the O-ring.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE CUMMINS?Yes—this O-ring seals the timing pin housing on 1989–1998 5.9L 12-valve B-series engines (VE and P-pump). Verify by VIN/ESN if components have been changed.
DOES IT FIT 3.9L 4BT OR 8.3L 6CT?Commonly used on those engines as well. Always confirm by engine serial number and timing cover style.
WHAT PARTS DOES THIS O-RING GO WITH?It seals the timing pin housing (3919683) and is often replaced with the timing pin (3903924), retaining ring (3904849), and housing seal (3915772).
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3913994 with the correct profile and material for the application.
WILL THIS FIT 24-VALVE OR COMMON-RAIL TRUCKS?This seal is primarily for 12-valve timing pin housings. Later engines may differ—confirm by ESN and cover design.
