16PCS Lifter & Rocker Arm Compatible For Jeep Grand Cherokee WJ 4.7L 1999-2004 EEP/WJ/099A OEM 53021077 53020742AC 53020742AB
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16PCS Lifter & Rocker Arm Compatible For Jeep Grand Cherokee WJ 4.7L 1999-2004 EEP/WJ/099A OEM 53021077 53020742AC 53020742AB
High end material: Made of selected alloy steel, with QPQ composite surface treatment and overall quenching and tempering heat treatment, the hardness of the head circular arc surface reaches 54-60HRC, which can withstand high load and high-frequency operation of the engine, greatly reducing the risk of wear and deformation.
Optimizing engine valve efficiency: using a roller type contact structure combined with DLC low friction coating, the friction coefficient is reduced to 0.08, reducing the friction loss between the valve and rocker arm.
Installation adaptation with zero error: Strictly follow OE factory specifications and IT6 level tolerance standards for processing, with a roughness Ra ≤ 0.4 μ m for key parts, and a precise control of the fit clearance between the rocker arm and shaft between 0.02-0.05mm. No additional debugging or polishing is required, and installation can be done directly by replacing.
Stable adaptation: Each rocker arm undergoes multiple factory inspections such as magnetic particle testing, ultrasonic testing, and hardness testing, with no quality issues such as cracks or sand holes.
16PCS Lifter & Rocker Arm Compatible For Jeep Grand Cherokee WJ 4.7L 1999-2004 EEP/WJ/099A OEM 53021077 53020742AC 53020742AB