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Dongfeng Truck Engine Spare Parts Diesel Engine Parts Rocker Arm 5305334 for Foton

he Cummins 5305334 Rocker Arm Assembly (Intake Rocker Lever) is an original equipment (OE) engine component designed for precise valve train operation in Cummins diesel engines. As a critical part of the valvetrain system, it transmits motion from the camshaft to the intake valves via pushrods, enabling accurate timing of valve opening and closing events.

This rocker arm is primarily used in Cummins ISF 2.8 / QSF 2.8 and related mid-size diesel engine platforms, commonly found in light-duty commercial trucks, industrial machinery, and power generation units. It features a roller-equipped design to reduce friction and wear, ensuring long service life under high-frequency operation and meeting Euro 5 emissions standards.

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Model:
5305334
Brand:
Dongfeng

Product Description

Attribute	Description
Part Name	Intake Rocker Arm Assembly / Rocker Lever
Function	Transfers camshaft motion to open/close intake valves; reduces mechanical stress with integrated roller bearing
Design Type	Roller-type rocker arm (pivot lever with needle bearing contact point)
Material	High-strength forged alloy steel, heat-treated for superior fatigue resistance and durability
Surface Treatment	Precision-ground contact surfaces; some variants include anti-wear coatings
Application	Diesel engine valvetrain systems – specifically intake side
Engine Position	Typically installed on cylinder head, secured with mounting bolts

Parameter	Specification
Weight	Approx. 3.75 lbs (1.7 kg) per unit
Design Standard	Engineered to meet Cummins OE specifications for ISF/QSF series
Roller Bearing	Integrated needle roller bearing at cam follower end to minimize sliding friction
Compatibility	Designed for engines complying with Euro 5 (Stage V) emission requirements
Durability	Built to withstand high-cycle loading typical of medium-speed diesel engines (up to 4,000+ hours under normal conditions)
Operating Environment	Functions within standard engine oil lubrication and temperature ranges (-30°C to +150°C ambient possible)