Product Description
Interstate-McBee M-3942565 Valve Tappet (Lifter) – 1998.5–2002 5.9L Cummins 24-Valve ISB
OE-style flat tappet (lifter) for the 1998.5–2002 Dodge Ram 2500/3500 equipped with the 5.9L Cummins 24-valve ISB. Precision-machined and hardened for reliable camshaft-to-valvetrain motion. Sold individually.
- Direct replacement: Interchange with Cummins reference 3942565.
- Durable build: Hardened wear surface for long service life.
- Service ready: Ideal for stock refreshes or camshaft replacement.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3942565 |
| OEM Reference | Cummins 3942565 |
| Type | Flat valve tappet (lifter) |
| Sold As | Each (1 tappet) |
| Qty Required | 12 tappets per engine |
| Position | Valvetrain – between camshaft lobe and push rod |
Vehicle Fitment
Always verify using your engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with 5.9L Cummins 24-valve ISB
- Model Years: 1998.5–2002
What’s Included
- (1) Valve tappet (lifter), P/N M-3942565
Recommended/Related Parts
- Camshaft (OE-spec)
- Push rods
- Valve bridges and rockers (as needed)
- Front cover gasket set / camshaft seal (if servicing cam)
- Assembly lube and break-in oil additive (flat-tappet safe)
Install Notes
- Replace all 12 tappets together when installing a new or reground camshaft.
- Coat lobes and tappet faces with high-zinc assembly lube; prime lubrication system before start-up.
- Maintain correct tappet orientation and keep components clean during installation.
- Follow Cummins service procedures and torque specs; change oil after break-in.
FAQ
How many tappets does my 24-valve 5.9L require?
12 total. This engine uses 12 cam lobes and 12 tappets. Parts are sold individually.
Should I replace tappets when installing a new cam?
Yes. Flat-tappet cams and lifters wear in together. Always use new tappets with a new camshaft.
Does this fit 12-valve (1989–1998) engines?
No. This listing is for 24-valve ISB (1998.5–2002). Verify by ESN if unsure.
