Engine Rocker Arm Cummins 4311991 | 3100776, 3680167, Z3680167

High-Performance Engine Rocker Arm for Heavy-Duty Cummins Engines

The Cummins 4311991 engine rocker arm (also referred to as a rocker lever) is a critical component designed to maintain the precise timing and operation of your engine’s valvetrain. By converting the rotational motion of the camshaft into the linear motion required to actuate the intake and exhaust valves, this rocker arm ensures optimal combustion efficiency and engine performance. This part is also available under the numbers: 3100776, 3680167, Z3680167.

Engineered for Extreme Durability

Built to withstand the high-stress environment of heavy-duty diesel engines, this rocker arm is manufactured from premium-grade materials. It is engineered to resist wear, minimize friction, and endure extreme thermal conditions, making it an ideal choice for demanding applications. Whether used in commercial trucks or industrial power generation, it delivers consistent, long-lasting reliability.

Applications and Fitment

This rocker arm is designed for compatibility with Cummins heavy-duty engines, particularly Tier 3 15-liter ISX and QSX series engines. It is also widely utilized in industrial generator sets and trailer-mounted generator systems, ensuring dependable operation across various heavy-duty setups.

Key Features & Benefits

• Precise Valve Actuation: Ensures accurate valve timing and duration for improved combustion and fuel efficiency.
• Heavy-Duty Construction: Made from high-strength materials to prevent deformation and premature wear under heavy loads.
• Reduced Maintenance Costs: Exceptional durability helps minimize downtime and extends the service life of your valvetrain.
• Guaranteed Fitment: Designed to meet strict dimensional and functional standards for a seamless installation.

Cross-Reference / Interchange Part Numbers

This part replaces / is interchangeable with the following part numbers:

• 4311991
• 3100776
• 3680167
• Z3680167