Product Introduction

The Rock Arm 618 is a heavy-duty engine rocker arm assembly designed for WD618 series diesel engines used in SINOTRUK HOWO heavy-duty trucks. The rocker arm is a critical valve train component responsible for transferring camshaft movement to the intake and exhaust valves, ensuring accurate engine valve timing and stable combustion performance. Rocker arms are widely used in heavy-duty diesel valve train systems to convert camshaft motion into valve actuation movement.

Manufactured from high-strength alloy steel with precision heat treatment processing, the rocker arm provides excellent resistance to wear, fatigue stress, and high-temperature operating conditions commonly found in commercial diesel engines.

This rocker arm assembly is commonly used in WD618, WD615, WD10, WP10, and WP12 engine platforms installed on HOWO, SHACMAN, and other heavy-duty truck applications. Similar rocker arm models such as part number 612600050178 are widely compatible with WD618 series engines.

During engine operation, the rocker arm ensures stable intake and exhaust valve movement, helping maintain engine compression efficiency, fuel economy, power output, and long-term operational reliability. Precision machining ensures accurate valve clearance and reliable compatibility with OEM cylinder head assemblies.

Each unit undergoes hardness inspection, dimensional testing, and fatigue durability verification before shipment to ensure long service life and dependable engine performance. Heavy-duty truck rocker arms are commonly manufactured using hardened steel materials for improved durability under high-load applications.

Technical Specifications

Vehicle Fitment

Payment & Shipping

Related Products Categories

Engine Parts System

Transmission & Drivetrain Parts

Chassis & Suspension Parts

Cabin & Body Parts