Product Description
Interstate-McBee M-3946168 Valve Cover Captive Isolator Cap Screw – 98.5–02 5.9L Cummins (24-Valve)
OE-style captive isolator cap screw used to secure the valve cover on 1998.5–2002 Dodge Ram 2500/3500 with the 5.9L Cummins 24-valve (ISB). Built to OE form, fit, and function. Sold individually.
- Direct replacement: Matches the form and thread of the factory fastener for a hassle-free install.
- Captive design: Integrated isolator helps reduce vibration and keeps hardware retained during service.
- Durable construction: Quality materials and coatings resist heat, oil, and corrosion.
- Service friendly: Ideal when refurbishing the valve cover, fixing stripped/missing hardware, or stopping seepage.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3946168 |
| OEM Reference | Cummins 3946168 |
| Application | Valve cover hardware (captive isolator cap screw) |
| Sold As | Each (1 screw with isolator) |
What’s Included
- (1) Valve cover captive isolator cap screw, P/N M-3946168
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (24-valve ISB)
- Model Years: 1998.5–2002
Recommended/Related Parts
- Valve cover gasket set (24-valve ISB)
- Valve cover grommets/isolators
- Valve cover (if cracked or warped)
- Engine oil cap seal
Install Notes
- Clean mating surfaces and replace worn grommets/isolators to prevent leaks.
- Hand-start threads to avoid cross-threading; torque to the Cummins service manual spec.
- Work evenly across the cover in a criss-cross pattern to ensure uniform sealing.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary ISB hardware and gaskets
FAQ
Will this fit my 1998.5–2002 5.9L Cummins?
Yes—this hardware is intended for the 24-valve ISB used from 1998.5–2002. For edge cases, verify by ESN.
How many do I need?
Sold individually. Your valve cover uses multiple fasteners; check your engine or parts manual and order the quantity required.
Is the gasket included?
No. Gaskets and other hardware are sold separately—consider replacing them during service.
