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Brand: C.OEFT
OE numbers: ASBG-RC.VQ35-12 （02-07）
Product Name: Timing Chain Kit
Compatible model:
Product status: New
Number of teeth on the product: /
Product weight: 4.2 kg
Packaging size: 40*40*10cm
Product packaging: Neutral Packaging
Car Series: Japanese
Car Type: For Nissan Teana
As the "central transmission link" of the Qashqai 2.5L’s timing system, the kit’s components work in tandem to maintain mechanical timing accuracy:
·Timing Chain: Connects the crankshaft and dual camshafts (QR25DE is a DOHC engine), strictly maintaining a 1:2 rotation ratio (a fundamental requirement for four-stroke engines). It ensures the intake/exhaust valves open and close at the exact moment corresponding to piston movements (intake → compression → power → exhaust strokes), preventing "timing misalignment"—a catastrophic failure that can cause valve-piston collision, leading to bent valves, damaged piston tops, or even engine block cracking.
·Tensioner: Automatically adjusts chain tightness based on engine load. When the chain stretches slightly due to long-term wear, the tensioner uses engine oil pressure to push the guide, compensating for slack and maintaining optimal tension. This avoids chain rattle (at idle) or tooth skip (at high speeds), ensuring stable timing.
·Guides & Damper: The upper/lower guides fix the chain’s running path, preventing lateral deviation during high-speed rotation; the damper absorbs chain vibration, reducing friction between the chain and sprockets. Together, they ensure the chain engages with camshaft/crankshaft sprockets stably, avoiding abnormal wear.
2. Adapt to High-Performance Demands of 2.5L QR25DE Engine
·Support High-Torque Output: The reinforced timing chain and dual-cushion tensioner are designed to handle the QR25DE engine’s high torque (233 N·m at 4,400 rpm). Even under extreme conditions (e.g., full-throttle acceleration, climbing with a full load), the kit maintains timing accuracy, ensuring the engine’s power output is not lost due to timing errors.
·Optimize Engine Efficiency: The low-friction guides and precision-machined chain reduce the timing system’s mechanical resistance by 25%, helping the QR25DE engine improve fuel efficiency by 3%-5% (especially in highway cruising). This balances the Qashqai 2.5L’s power performance and fuel economy.
·Engine-Specific Calibration: Strictly developed based on the structural parameters of Nissan’s 2.5L QR25DE engine (the core power unit of the Qashqai 2.5L model). The kit’s timing chain length (122 links, standard for QR25DE), sprocket tooth pitch, tensioner stroke, and guide contour are 100% aligned with the engine’s timing system, avoiding issues like "chain slack," "guide interference," or "tensioner misalignment" that occur with universal kits.
·Unitized Design for Easy Installation: Labeled as "Unit ASBG-RC.QR25XK-11," the kit adopts a pre-sorted, unitized packaging structure—all components (timing chain, primary/secondary tensioners, upper/lower timing guides, chain damper) are grouped by assembly sequence. This eliminates the need for repair technicians to identify part compatibility separately, reducing installation time by 35% compared to scattered component purchases.
·OE-Grade Matching: Key components (e.g., the timing chain’s material composition, tensioner’s hydraulic pressure parameters) meet Nissan’s original equipment (OE) quality standards. It can directly replace the Qashqai 2.5L’s original timing parts without modifying the engine block or timing cover, ensuring consistent performance with the vehicle’s original design.
2. Reinforced Durability for High-Torque Scenarios of 2.5L Engines
·High-Strength Timing Chain: Crafted from chrome-molybdenum-vanadium alloy steel (higher strength than standard alloy steel), with a four-step precision processing workflow: forging → precision rolling → carburizing quenching → surface polishing. Its tensile strength reaches 1,400 MPa (20% higher than ordinary timing chains), and surface hardness is HRC 60-63—capable of withstanding the high torque output of the QR25DE engine (maximum torque 233 N·m) without stretching or tooth deformation.
·Dual-Cushion Tensioner: Equipped with a hydraulic tensioner with dual-cushion structure (primary spring + secondary oil pressure buffer). It can adapt to the QR25DE engine’s variable load conditions (e.g., sudden acceleration, high-speed cruising) by adjusting tension in real time, avoiding "over-tension" (which accelerates chain wear) or "under-tension" (which causes chain skip). The tensioner housing uses heat-resistant PA66+GF40 engineering plastic (40% glass fiber reinforcement), resistant to 230℃ high temperatures (common in 2.5L engine long-term operation).
·Wear-Resistant Guides & Damper: The timing guides are made of PTFE-reinforced polyamide (PTFE content 15%), which reduces friction coefficient with the chain to 0.08 (30% lower than ordinary plastic guides), extending guide life to 200,000 km. The chain damper adopts high-density EPDM rubber with a metal skeleton, which can absorb 85% of chain vibration at high speeds (up to 6,800 rpm), reducing operating noise.
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