Product Description
Interstate-McBee M-3900706 Rocker Lever Adjuster Screw – 89–98 5.9L Cummins 12-Valve
High-quality aftermarket rocker lever adjusting screw for the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Manufactured to OEM tolerances for smooth valve lash adjustment and long-term reliability. Sold individually.
- Direct OEM replacement: Matches Cummins 3900706 for 12-valve B-series applications.
- Precision-machined threads: Ensures accurate lash adjustment and secure locknut engagement.
- Durable construction: Hardened steel for maximum wear resistance.
- Interstate-McBee quality: Engineered and inspected to ISO 9001 standards.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3900706 |
| OEM Reference | Cummins 3900706 |
| Component Type | Rocker lever adjusting screw (“valve lash screw”) |
| Material | Hardened steel |
| Sold As | Each (1 screw) |
| Qty Required (12V) | 12 adjuster screws (one per valve) |
What’s Included
- (1) Rocker lever adjuster screw – P/N M-3900706
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500 / 3500 – 5.9L Cummins 12-valve 6BT (1989–1998)
- Other Cummins B-Series industrial or ag applications using part #3900706
Recommended / Related Parts
- Interstate-McBee M-3900250 Valve Keeper (Locks)
- Interstate-McBee M-3900299 Valve Spring Retainer
- Interstate-McBee M-3283335 Head Gasket (12-Valve)
- Interstate-McBee M-3802355 Intake Valve Kit
- Interstate-McBee M-3802356 Exhaust Valve Kit
Installation Notes
- Always set valve lash with engine cold and at TDC for each cylinder.
- Torque locknut per Cummins service specifications (usually 18–22 ft-lb).
- Replace adjuster screws and locknuts as a matched pair if either shows wear.
Why Buy From CPP Diesel
- Authorized Interstate-McBee dealer – factory direct inventory
- ESN-verified fitment assistance
- Fast shipping and knowledgeable diesel support staff
FAQ
Is this the same as Cummins 3900706?
Yes – this Interstate-McBee part is a direct aftermarket replacement for Cummins OEM #3900706.
How many do I need for a 5.9L 12-valve?
Twelve (12) adjuster screws – one per valve rocker.
Does this fit the 24-valve 5.9L?
No, this part fits only the 1989–1998 12-valve 6BT engines.
