Product Description
Interstate-McBee M-3946168 Valve Cover Captive Isolator Cap Screw – 98.5–02 5.9L Cummins
Replace worn or missing valve cover hardware with the Interstate-McBee M-3946168 captive isolator cap screw. Built to OEM-equivalent dimensions for the 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins 24-valve (ISB), this bolt secures the rocker/valve cover and helps maintain a reliable seal when paired with the correct washer and gasket.
- Direct replacement: Aftermarket equivalent to OEM
3946168for BS3 5.9L B-series engines. - Captive isolator design: Helps control vibration and protects sealing surfaces for long-term reliability.
- Precise fitment: Engineered to OEM spec for straightforward install with factory covers.
- Value: Premium Interstate-McBee quality at a cost-effective price point.
Specifications
| Brand | Interstate-McBee |
|---|---|
| Part Number | M-3946168 |
| OEM Cross-Reference | Cummins 3946168 |
| Application | Valve/Rocker Cover Captive Isolator Cap Screw |
| Sold As | Each (order quantity as needed; factory cover typically uses 5 bolts) |
Vehicle Fitment
Always verify with your engine serial number (ESN) for exact compatibility.
- Dodge Ram 2500 / 3500 — 5.9L Cummins 24-valve (ISB)
- Model Years: 1998.5, 1999, 2000, 2001, 2002
What’s Included
- (1) Valve cover captive isolator cap screw (bolt) – M-3946168
Recommended Companion Parts
- Valve cover sealing washer (Cummins
3942659) – replace when changing bolts. - Valve cover gasket (Cummins
3935878) – inspect/replace if flattened or leaking.
Install Notes
- Clean the bolt bore and sealing surfaces; remove old debris and oil.
- Use the correct torque per the Cummins service manual for your ESN.
- Replace all washers; avoid mixing old hardware with new fasteners.
Warranty
New Interstate-McBee engine parts are generally covered for 24 months from installation; select valve-train components may be 12 months. See manufacturer policy for details.
Why Buy From CPP Diesel
- Tech-backed fitment and ESN verification.
- Fast shipping and hassle-free returns.
- Curated 5.9L Cummins parts to complete the job in one order.
FAQ
How many bolts does the factory valve cover use?Typically five (5) bolts for the 24-valve 5.9L cover. Replace washers at the same time.
Does this include the rubber sealing washer?
No. Washers are sold separately. Use the correct washer (e.g., Cummins
Will this fit 12-valve applications?
3942659) for proper sealing.This hardware is listed for the 1998.5–2002 24-valve ISB. Verify by ESN if your setup is non-stock.
Is the Interstate-McBee version OEM quality?
Interstate-McBee builds to OEM-equivalent form, fit, and function, offering a reliable aftermarket alternative to the OE bolt.
Product Videos
Custom Field
YEAR 1998.5-2002
MAKE DODGE
ENGINE 5.9L
