Interstate-McBee M-3900706 Rocker Lever Adjuster Screw – 89–98 5.9L Cummins (12-Valve)

OEM-style rocker lever adjuster screw for setting valve lash on Cummins B-Series 5.9L 12-valve engines. The Interstate-McBee M-3900706 delivers precise adjustment and long service life at an aftermarket price point—ideal for stock refreshes and full top-end services on 1989–1998 Dodge Ram 2500/3500.

• Direct OEM cross: Interchanges with Cummins 3900706 and common service numbers (see Cross-Reference).
• Precise lash control: Restores accurate valve train geometry and smooth operation.
• Aftermarket value: Interstate-McBee quality at significant savings vs. OEM boxed parts.
• Sold individually: Order 12 per engine (one per rocker lever).

Specifications

Vehicle Fitment

Always verify using your engine serial number (ESN) for exact compatibility.

• Dodge Ram 2500/3500 — 1989–1998 with 5.9L Cummins 12-Valve (6BT)
• Additional B-Series applications (e.g., 3.9L 4BT and industrial variants) may use this adjuster; confirm by ESN.

Install Notes

• Replace any damaged adjusters or locknuts; inspect rocker levers and pushrod tips during service.
• Set valve lash according to the Cummins service manual for your ESN and torque locknuts per spec.
• Adjust on a cold engine unless otherwise specified by the manual; re-check lash after initial run-in.

Cross-Reference

Interchanges with Cummins 3900706 and commonly with 3937438, 3934086, and 3927692. Use these numbers for comparison only; verify by ESN before ordering.

What’s Included

• (1) Rocker lever adjuster screw

Why Buy From CPP Diesel

• Pro-verified B-Series fitment and ESN support
• Fast shipping and hassle-free returns
• Great selection of complementary valvetrain parts (rocker levers, pushrods, springs, seals)

FAQ