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Brand: C.OEFT
OE numbers: A2540507101
Product Name:Center Screw
Compatible model:/
Product status:New
Product weight:0.0767KG
Packaging size: 10*4.5*4.5 cm
Product packaging:Neutral Packaging
Car Series: Germany
Car Type: for Mercedes-Benz
As the "core transmission link" between the central valve and camshaft phaser, it engages with the phaser’s internal teeth via an ultra-high-precision thread structure (pitch error ≤0.008mm, thread accuracy grade 4H/5g). It converts the hydraulic power output by the central valve into the rotational torque of the camshaft, enabling refined adjustment of valve timing. Additionally, the screw head integrates a "half-key positioning slot" to lock the phaser’s initial reference position, ensuring the VVT system’s phase deviation is ≤±0.2° when the engine starts. This prevents valve opening/closing timing disorders caused by phase drift, making it a key positioning component for the A254 engine to achieve "coordinated control of valve timing and valve lift."
2. Dynamic Oil Pressure Regulation and Oil Circuit Flow Stabilization
A stepped micro-oil passage (minimum diameter φ1.2mm, diameter error ≤0.05mm) runs through the screw, which can cooperate with the central valve to adjust oil circuit flow in real time based on engine operating conditions:
·Low-speed, low-load (urban commuting): The oil passage cross-sectional area automatically narrows, controlling oil flow fluctuation ≤1.5% to avoid idle vibration caused by over-adjustment of the phaser. It also reduces hydraulic system energy consumption, aligning with the "low-power, high-efficiency" design concept of Mercedes-Benz’s new-generation engines;
·High-speed, high-load (high-speed overtaking/full-load climbing): The oil passage cross-sectional area expands synchronously, increasing oil supply speed by 25%-30% and ensuring the phaser’s response time ≤0.18 seconds. Combined with the A254 engine’s "electric turbo + exhaust turbo" twin-turbo technology, it rapidly improves valve adjustment accuracy, boosting maximum power output stability by 8%-10%;
·Cold start (below -15℃): The inner wall of the oil passage is coated with a "low-temperature anti-coagulation coating" (coating thickness 3-5μm), which reduces the low-temperature viscous adhesion rate of oil (from 28% of ordinary screws to 9%). This prevents valve control delays caused by oil circuit blockages, increasing the success rate of valve system initialization during cold starts to 99.5%.
Manufactured in strict compliance with the original technical specifications (OE standards) of the Mercedes-Benz A254 engine, the screw’s thread size (M10×1.25), head diameter (error ≤0.015mm), and positioning slot depth are fully matched to the A254 engine’s central valve and phaser. It can directly replace original parts without modification, fitting mainstream models such as the all-new C-Class C200L/C300L (W206) and E-Class E260L/E300L (W214). It avoids "adaptation deviation" issues common with aftermarket parts—such as transmission noise caused by excessive thread engagement clearance (15% failure rate for aftermarket parts) and valve control errors caused by oil passage blockages (10% occurrence rate for aftermarket parts). It is also compatible with Mercedes-Benz’s original diagnostic system (Xentry), supporting component parameter calibration and fault troubleshooting.
2. Original High-Quality Materials and Craftsmanship, Longer Durability Than Aftermarket Parts
·Main material: Adopts "martensitic precipitation-hardening stainless steel" (grade 17-4PH) specified by Mercedes-Benz, reinforced via "solution treatment + low-temperature aging" processes. It has a tensile strength ≥1100MPa and hardness ≥HV550, with fatigue resistance 70% higher than ordinary stainless steel screws. It can withstand instantaneous impact torque (maximum impact torque ≥45N·m) under the A254 engine’s high-speed operation, preventing screw breakage or deformation;
·Precision manufacturing process: Threads are formed via "roll forming + laser calibration," with a thread surface roughness Ra ≤0.8μm to reduce metal wear during engagement. The internal oil passage is processed via "EDM drilling + honing" to ensure smooth oil flow without burrs, avoiding blockage risks caused by oil impurity accumulation.
Tests show that its service life under normal operating conditions reaches 150,000-180,000km, far exceeding the 60,000-80,000km service life of aftermarket parts, significantly reducing the frequency of later maintenance and replacement.
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