Product Description
Cummins 3913994 OEM Timing Pin O-Ring – 5.9L 12-Valve (1989–1998)
The Cummins 3913994 OEM Timing Pin O-Ring is a genuine replacement sealing O-ring designed for the timing pin assembly used on 1989–1998 Cummins 5.9L 12-valve diesel engines. This small but critical seal helps prevent oil leaks around the timing pin access location while maintaining proper engine sealing and reliability.
Whether you're performing a timing adjustment, injection pump service, engine rebuild, or routine maintenance, replacing the timing pin O-ring is recommended to ensure a proper seal and prevent oil seepage. Manufactured to Cummins OEM specifications, the 3913994 O-ring delivers the fit, durability, and reliability required for long-term service life.
Features
- Genuine Cummins OEM replacement O-ring
- Direct replacement for Cummins part number 3913994
- Designed for timing pin assembly sealing
- Helps prevent oil leaks and seepage
- Manufactured to OEM specifications
- Resistant to engine oil and heat exposure
- Ideal for maintenance, timing adjustments, and engine rebuilds
- Simple installation with factory-style fitment
- Ensures proper timing pin bore sealing
- Trusted Cummins OEM quality
Fitment
- 1989 Cummins 5.9L 12-Valve Diesel
- 1990 Cummins 5.9L 12-Valve Diesel
- 1991 Cummins 5.9L 12-Valve Diesel
- 1992 Cummins 5.9L 12-Valve Diesel
- 1993 Cummins 5.9L 12-Valve Diesel
- 1994 Cummins 5.9L 12-Valve Diesel
- 1995 Cummins 5.9L 12-Valve Diesel
- 1996 Cummins 5.9L 12-Valve Diesel
- 1997 Cummins 5.9L 12-Valve Diesel
- 1998 Cummins 5.9L 12-Valve Diesel
Note: Verify part number and application before ordering. Replacing the timing pin O-ring during service helps prevent future oil leaks and ensures proper sealing.
What's Included
- One (1) Genuine Cummins 3913994 Timing Pin O-Ring
Specifications
- Manufacturer: Cummins
- Part Number: 3913994
- Product Type: Timing Pin O-Ring
- Material: OEM Oil-Resistant Rubber Compound
- Application: Timing Pin Assembly Seal
- Engine Compatibility: Cummins 5.9L 12-Valve Diesel
- Fitment Years: 1989–1998
- Installation Location: Timing Pin Access Port
- OEM Replacement: Yes
- Condition: New
Cross Reference Numbers
3913994
FAQ
What does the Cummins 3913994 O-ring seal?
This O-ring seals the timing pin assembly and timing pin access location on Cummins 5.9L 12-valve diesel engines to help prevent oil leaks.
Should I replace the timing pin O-ring during maintenance?
Yes. Replacing the O-ring whenever the timing pin is removed or serviced is recommended to ensure a proper seal and prevent future oil seepage.
Will this fit a 24-valve Cummins engine?
This part is commonly associated with 1989–1998 5.9L 12-valve Cummins applications. Verify fitment for your specific engine before ordering.
Is this a genuine Cummins part?
Yes. The 3913994 is a genuine Cummins OEM replacement component designed to meet factory specifications.
Can a damaged timing pin O-ring cause an oil leak?
Yes. A worn, cracked, or damaged O-ring can allow engine oil to seep from the timing pin access area and should be replaced if leakage is present.
