Product Description
Interstate-McBee M-3942565 Valve Tappet (OEM# 3942565) – 98.5–02 5.9L Cummins 24V
OEM-style valve tappet (lifter) engineered by Interstate-McBee for the 1998.5–2002 5.9L Cummins 24-valve (ISB). Precision-machined for correct pushrod cup geometry and stable cam-to-tappet contact. Sold individually— 12 required per engine.
- Direct replacement: Matches OEM Cummins 3942565 for fit and function.
- Durable materials & finish: Built for long service life in stock and tow/haul applications.
- Correct footprint design: Clears the fuel-lift-pump eccentric and works with stock or mild cams.
- Aftermarket value: Interstate-McBee quality at a fraction of OEM pricing.
Specifications
| Manufacturer | Interstate-McBee |
|---|---|
| Part Number | M-3942565 |
| OEM Cross-Ref | Cummins 3942565 |
| Engine Family | Cummins B-Series / ISB 5.9L (24V) |
| Years | 1998.5, 1999, 2000, 2001, 2002 |
| Sold | Individually (12 pieces required per engine) |
What’s Included
- (1) Interstate-McBee valve tappet (lifter)
Vehicle Fitment
Always verify with your engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 — 5.9L Cummins 24-valve ISB (1998.5–2002)
Installation Notes
- Use clean engine oil for prelube and ensure lifters move freely in bores.
- Inspect cam lobes, pushrods, and rocker components during service; replace worn parts as needed.
- Follow the Cummins service manual for torque values and lash adjustments.
Warranty
Interstate-McBee new engine components include manufacturer warranty coverage. Contact us with your ESN for terms specific to this tappet.
Why Buy From CPP Diesel
- Diesel-specialist fitment support for Cummins B-Series
- Fast shipping and easy returns
- ESN verification available to prevent mis-orders
FAQ
How many tappets do I need?They are sold individually. You need 12 tappets for one 5.9L 24V engine.
Will this fit my 12-valve 1989–1998 5.9L?
No—those typically use a different OEM tappet (e.g., 3931623). This M-3942565 is for 1998.5–2002 24-valve ISB applications.
What camshafts is this compatible with?
Stock and mild aftermarket grinds for 24V ISB. For aggressive cam profiles, consider matched performance tappets.
Do I need special sealants or tools?
Follow the Cummins service manual. Prelube lifters, keep parts clean, and torque to spec. No special tools beyond standard valvetrain service tools.
