Product Description
Genuine Cummins
Cummins 3907998 — Timing Pin Housing Bolt (Round Head Cap Screw)
MPN: 3907998 | Also Known As: timing pin housing bolt, round head cap screw | Used On: 5.9L 12-valve B-Series (’89–’98)
Why This Part
- ✓ OE fastener that secures the timing pin housing on 12-valve 5.9L Cummins.
- ✓ Direct-fit replacement; restores proper retention and sealing.
- ✓ Durable OE hardware—correct head, thread, and hardness.
OE Fit Stock Replacement Sold Individually
Quick Specs
| Type | Round Head Cap Screw / Timing Pin Housing Bolt |
|---|---|
| OE Part # | 3907998 |
| Qty Required | 1 per timing pin housing (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1993 | 5.9L 12-Valve (VE pump) | D250/D350 & W250/W350 |
| 1994–1998 | 5.9L 12-Valve (P7100) | Ram 2500/3500 |
Notes: Common across 12-valve 5.9L applications. Always verify by VIN/ESN if components have been changed.
Often Paired With
- Timing Pin Housing: Cummins 3919683
- Timing Pin: Cummins 3903924
- Timing Pin Housing Seal/Retainer: Cummins 3915772
What’s In The Box
- (1) Genuine Cummins Timing Pin Housing Bolt / Round Head Cap Screw (3907998)
- Related housing, pin, and seal sold separately (see “Often Paired With”).
Install Tips
- Inspect the housing and timing cover seat; clean threads before install.
- Apply correct torque per service manual; avoid over-tightening.
- If a previous failure shed debris, inspect/clean before reassembly.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE CUMMINS?Yes—this is the OE bolt for the timing pin housing on 1989–1998 5.9L 12-valve applications.
IS THIS THE BOLT FOR THE TIMING PIN HOUSING?Correct—this fastener secures the timing pin housing to the timing cover.
HOW MANY DO I NEED?One per housing is typical; this part is sold individually. Check your specific housing to confirm count.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3907998 (round head cap screw).
WHAT OTHER PARTS SHOULD I REPLACE WHILE I’M THERE?Consider a new timing pin housing (3919683), timing pin (3903924), and housing seal/retainer (3915772) if worn or damaged.
