Product Description
Interstate-McBee M-3931623 Valve Tappet (Lifter) – 1989–1998 5.9L Cummins 12-Valve
Direct-fit replacement valve tappet (cam follower) for the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Manufactured to OE dimensions and hardness for reliable valvetrain operation. Sold individually.
- OE-equivalent performance: Matches the form, fit, and function of the factory tappet.
- Durable construction: Hardened face and precision-ground body for long service life.
- Smooth operation: Helps maintain correct valve lift and timing with minimal wear.
- Great value: Interstate-McBee quality at a competitive price point.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3931623 |
| OEM Reference | Cummins 3931623 |
| Component | Valve Tappet (Cam Follower / Lifter) |
| Sold As | Each (1 tappet) |
| Qty Required (12V) | 12 tappets (one per cam lobe) |
| Engine Family | Cummins B-Series (6BT 5.9L 12-valve) |
What’s Included
- (1) Valve tappet, P/N M-3931623
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
- Model Years: 1989–1998
- Additional Cummins B-Series applications where 3931623 is specified (confirm by ESN).
Recommended/Related Service Parts
- Camshaft (inspect for wear/pitting before re-use)
- Push rods
- Rocker arms and bridges
- Head gasket and valve cover gaskets (if doing top-end service)
Install Notes
- Always lubricate tappet faces and cam lobes during installation.
- Rotate the engine and verify free movement of each tappet in its bore.
- Follow the Cummins service manual torque specs and valve lash procedure.
- Replace as a full set when the cam is replaced for best wear-in.
Why Buy From CPP Diesel
- ESN-verified fitment assistance from diesel specialists
- Fast shipping and easy returns
- Deep inventory of B-Series valvetrain components
FAQ
How many tappets do I need?
The 12-valve 5.9L uses 12 tappets—one per cam lobe. This item is sold individually.
Should I replace the camshaft too?
If the old tappets show pitting, spalling, or unusual wear, inspect the cam lobes closely. It’s best practice to replace tappets as a set when installing a new cam.
Does this fit 24-valve (1998.5–2002) engines?
No. This listing is for 12-valve applications. Verify part numbers for 24-valve engines.
