Product Description
CUMMINS 3907998 OEM TIMING PIN HOUSING BOLT (ROUND HEAD CAP SCREW) – 5.9L 12-VALVE (1989–1998)
The genuine CUMMINS 3907998 OEM timing pin housing bolt is the factory round-head cap screw used to secure the timing pin housing on 1989–1998 5.9L 12-valve Cummins engines. This bolt is essential for maintaining proper location and sealing of the timing pin assembly on both VE-pumped (1989–1993) and P7100-pumped (1994–1998) B-series engines.
Because the timing pin housing is frequently removed during pump timing, front cover service, and top-end work, this bolt often becomes rounded, stretched, or lost. Replacing worn hardware with an authentic Cummins fastener ensures proper clamping force, correct length, and OE reliability.
Perfect for restorations, timing adjustments, front cover reseals, and pump upgrades, this bolt restores the original factory integrity of the timing pin assembly.
Key Features
- Genuine Cummins OEM round-head bolt ensures proper sealing and alignment.
- Correct hardness, length, and thread pitch for the timing pin housing.
- Compatible with VE and P7100 pump timing pin assemblies.
- Ideal replacement when refurbishing or reinstalling timing covers.
- Prevents leaks and timing pin misalignment caused by incorrect hardware.
Fitment Details
- Engine: 5.9L Cummins B-Series 12-Valve
- Years: 1989–1998
- Fuel Pumps: Bosch VE (1989–1993), Bosch P7100 (1994–1998)
- Function: Secures the timing pin housing to the front gear cover
Always confirm by engine serial number (ESN) when replacing Cummins hardware.
Cross-Reference & Companion Cummins Parts
CPP Diesel carries the complete lineup of genuine Cummins timing components. Pair this bolt with other related items for a full OE-correct timing service:
- CUMMINS 3934988 OEM TIMING PIN
- CUMMINS 3906698 FRONT COVER GASKET
- CUMMINS 3937111 FRONT CRANK SEAL W/ INSTALL TOOL
- VIEW MORE GENUINE CUMMINS PARTS
Common Cummins associations: 3907998 (bolt), timing pin assemblies 3934988, 3906698 gasket references.
Installation Notes
- Clean the front cover mating surface prior to bolt installation.
- Always torque to Cummins spec to avoid distortion of the timing pin housing.
- Replace bolts showing corrosion, stretching, or worn heads.
Specifications for cummins 3907998
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3907998 |
| Function | Round head cap screw for timing pin housing attachment |
| Engine Compatibility | 5.9L Cummins B-Series 12-Valve (1989–1998) |
| Vehicle Fitment | Dodge Ram 2500/3500 (1989–1998) with 5.9L Cummins |
| UPC | Not supplied by Cummins for this hardware item |
| GTIN | Not supplied |
| Shipping Weight | ~0.02 lb |
| Shipping Method | Standard ground; ships small parcel from CPP Diesel |
| Cross Reference | Used with timing pin 3934988 and front cover components such as 3906698 |
| E-Codes / Emissions | Non-certified 5.9L B-series mechanical engines |
| Prop 65 Warning | WARNING: May expose you to chemicals found in metal hardware and engine oil residues. For more information visit www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins |
Frequently Asked Questions
IS THIS THE CORRECT BOLT FOR MY TIMING PIN HOUSING?
Yes. CUMMINS 3907998 is the OEM round-head cap screw used to secure the timing pin housing on 1989–1998 5.9L 12-valve Cummins engines.
WILL THIS WORK ON BOTH VE AND P7100 ENGINES?
Yes—this bolt is used on VE-pumped 12V engines (1989–1993) and P7100-pumped 12V engines (1994–1998).
DOES THIS COME WITH THE TIMING PIN?
No. The timing pin is sold separately. You can find it here: CUMMINS 3934988 OEM TIMING PIN.
SHOULD I REPLACE THIS BOLT WHEN DOING A FRONT COVER GASKET?
It is recommended—aging hardware often fails during reinstallation. Fresh OEM bolts ensure proper sealing and alignment.
IS THIS A GENUINE CUMMINS FASTENER?
Yes. CPP Diesel sells only genuine Cummins fasteners for all timing components.
