null AW-17220743903, GT-K4ZB5X3V
CUMMINS

CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) – 5.9L 12-VALVE (1989–1998)

(No reviews yet) Write a Review
SKU:
CUM3937438
MPN:
3937438
Shipping:
Calculated at Checkout
  • CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) – 5.9L 12-VALVE (1989–1998)
  • CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) – 5.9L 12-VALVE (1989–1998)
  • CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) – 5.9L 12-VALVE (1989–1998)
  • CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) – 5.9L 12-VALVE (1989–1998)
  • CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) – 5.9L 12-VALVE (1989–1998)
  • CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) – 5.9L 12-VALVE (1989–1998)
$14.89

Description

Genuine Cummins

Cummins 3937438 — Rocker Lever Adjusting Screw (Valve Lash Adjuster)

MPN: 3937438  |  Also Known As: rocker arm adjuster screw, valve lash adjuster  |  Sold: Individually (12 per engine for a full set)

Why This Part

  • OE ball-end geometry for precise valve lash and smooth rocker motion.
  • Direct-fit for 5.9L 12-valve rocker levers (1989–1998).
  • Hardened wear surfaces to reduce pitting and extend valvetrain life.
  • ✓ Ideal when refreshing valvetrain, changing pushrods, or repairing lash issues.
OE Fit Stock Replacement 12 Per Engine

Quick Specs

Type Rocker lever adjusting screw (valve lash adjuster)
OE Part # 3937438
Qty Required 12 per engine (sold individually)
Use Case Restores correct valve lash; replace when ball-end is worn/pitted

Verified Fitment (Automotive)

Year RangeEngineChassis
1989–1998 5.9L Cummins 6BT (12-Valve) Dodge/Ram 2500 & 3500

Industrial/Off-Highway: Used primarily on Euro 2 5.9L B-series engines—verify by ESN before ordering.

Often Paired With

  • Rocker Arms: Cummins 3910810 (exhaust), 3910811 (intake)
  • Pushrods: Cummins 3284377 (commonly paired on 12-valve refreshes)
  • Adjusting lock nut: replace any rounded/damaged nuts during lash service

What’s In The Box

  • (1) Genuine Cummins Rocker Lever Adjusting Screw (3937438)

Install Tips

  • Set valve lash to the factory specification from the Cummins service manual.
  • Inspect rocker tips and pushrod cups; replace any worn components.
  • Torque the lock nut to spec and recheck lash after initial warm-up.

FAQ

HOW MANY ADJUSTER SCREWS DO I NEED?

There are 12 rocker levers on the 5.9L 12-valve—order 12 pieces for a complete set. This item is sold individually.

WILL THIS FIT 24-VALVE OR COMMON-RAIL ENGINES?

This part targets the 5.9L 12-valve (1989–1998). Later VP44 24-valve and 2003+ common-rail engines use different rocker/adjuster designs.

IS THIS A GENUINE CUMMINS PART?

Yes—OE Cummins 3937438.

SHOULD I REPLACE PUSHRODS OR ROCKER ARMS AT THE SAME TIME?

Inspect for wear. Many techs replace worn pushrods and any damaged rocker arms while resetting lash for best results.

DO I NEED ANY SPECIAL TOOLS?

Basic hand tools and feeler gauges for lash. Follow Cummins’ lash procedure and torque specs.

View AllClose

Additional Information

Vehicle Year:
1989,1990,1991,1992,1993,1994,1995,1996,1997,1998
Vehicle Make:
DODGE
ENGINE:
5.9L
View AllClose

0 Reviews

View AllClose