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Brand: C.OEFT
OE numbers: ASBG-BYD371QA-7
Product Name: Timing Chain Kit
Compatible model:
Product status: New
Number of teeth on the product: /
Product weight: 10.000kg
Packaging size: 40X40X10cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type:for BYD F3
As the "mechanical clock" of the BYD F3’s 371QA engine, the timing chain and gear work in tandem to maintain the accuracy of the four-stroke cycle:
·Power Transmission & Timing Synchronization: The timing gear (mounted on the crankshaft) drives the timing chain, which in turn rotates the camshaft—strictly maintaining a 1:2 rotation ratio (fundamental for four-stroke engines). This ensures the intake/exhaust valves open and close at the exact moment corresponding to piston movement (intake → compression → power → exhaust), preventing "timing misalignment" (which causes symptoms like unstable idling, reduced power, or even valve-piston collision in severe cases).
·Tension Maintenance (Chain Kit): The hydraulic tensioner compensates for chain slack caused by long-term wear in real time, pushing the guide to fit tightly against the chain. This avoids "chain rattle" (a common noise issue in old BYD F3s) and "chain skip" (which disrupts timing and triggers the engine fault light), ensuring stable operation during daily commuting.
2. Adapting to BYD F3’s Economical Usage Scenarios
·Optimizing Fuel Efficiency: The low-friction chain-gear combination reduces the 371QA engine’s mechanical resistance by 20% compared to worn OEM components. Tests show a 2%-3% improvement in urban fuel economy for the BYD F3 (from 6.5 L/100km to 6.3 L/100km)—a meaningful saving for owners who drive 10,000-15,000 km annually (saving ~20-30 liters of fuel per year).
·Reducing Maintenance Frequency: With a service life of 150,000 km, the kit far exceeds the replacement cycle of low-quality timing components (usually 80,000 km). This reduces the number of engine disassembly operations for the BYD F3, avoiding potential risks of engine damage from frequent repairs and saving owners time and labor costs.
·Engine-Specific Calibration for 371QA Power Trains: Strictly developed based on the structural parameters of BYD’s 371QA 1.0L engine (maximum power 50kW, peak torque 90N·m). Key specifications—including the timing chain’s link count (98 links, standard for 371QA), timing gear tooth profile (modulus 2.0, pressure angle 20°), and tensioner oil pressure range (6-9 psi)—are 100% matched to BYD’s OEM standards. This eliminates issues like "chain-gear mismeshing" or "tensioner incompatibility with the engine’s low-pressure oil circuit" common in universal kits, which could cause timing failures in the 371QA’s low-speed, long-duty-cycle operation.
·Integrated Chain-Gear Design, No Compatibility Risks: Unlike separate purchases of timing chains and gears (which may have mismatched wear rates or dimensional deviations), this integrated solution ensures the chain and gear are calibrated as a single unit. The gear’s tooth pitch and the chain’s link spacing are precisely aligned, avoiding premature wear caused by "micro-slip" between mismatched components—a critical advantage for the BYD F3’s usage scenario of daily urban commuting (2000-3000 rpm).
·Plug-and-Play for BYD F3’s Engine Bay: Optimized for the compact engine bay layout of the BYD F3. The timing gear’s mounting flange and the chain kit’s guide brackets fit perfectly with the 371QA engine’s cylinder block and timing cover, requiring no modifications. Professional technicians can complete the replacement in 2-3 hours, 30% faster than non-specialized kits.
2. Durable Materials for Economical Engine’s Long Service Cycle
·High-Wear-Resistance Timing Chain: Made of high-carbon alloy steel (50Mn2)—a cost-effective yet durable material tailored for the 371QA engine’s low-torque characteristics. It undergoes a three-step process: "cold drawing forming → surface quenching (hardness HRC 58-60) → anti-rust plating", ensuring tensile strength of 1200MPa (sufficient for the 371QA’s 90N·m torque) and resistance to oil oxidation. The chain’s service life exceeds 150,000 km, matching the BYD F3’s typical ownership cycle (5-8 years).
·Precision-Machined Timing Gear: Crafted from ductile iron (QT500-7)—chosen for its balance of strength and cost-effectiveness—with "hobbing → shaving → carburizing" precision machining. The gear’s tooth surface roughness is Ra 0.8μm (half that of low-grade gears), reducing friction with the chain by 25% and avoiding "tooth pitting" (a common failure in cheap gears). The gear’s hub is reinforced to prevent cracking under the 371QA’s continuous low-speed operation.
·Heat-Resistant & Low-Cost Guides/Tensioner: The guides adopt PA66+GF30 engineering plastic (30% glass fiber), which tolerates the 371QA engine’s maximum operating temperature of 180℃ without deformation. The hydraulic tensioner uses a "spring-assisted single-chamber" design (simpler than high-performance tensioners but sufficient for low-torque engines) with a rubber seal that resists degradation from ordinary mineral oil (commonly used in BYD F3 maintenance), ensuring 100,000 km of lea
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