477F-1004020BA

Brand: Chery

Model: A13

Product Name：Piston 0.25

Part Number: 477F-1004020BA

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Product Details

Chery A13 Piston (0.25, Part No.: 477F-1004020BA)

First, let’s define its core role: the Chery A13 Piston (0.25, 477F-1004020BA) is the "power core of the engine’s combustion chamber"—a precision-machined metal component that moves back and forth inside the A13’s 477F engine cylinder. Its main jobs? To compress the air-fuel mixture in the cylinder (preparing it for combustion), absorb the force of fuel ignition (pushing the connecting rod to turn the crankshaft, which drives the car), seal the combustion chamber (preventing high-pressure gas leaks), and transfer excess heat to the cylinder wall (keeping the piston from overheating). Without it, the engine can’t generate power—your A13 won’t run.

The "0.25" in its label refers to its oversize repair dimension (0.25mm larger than the standard piston). It’s designed specifically for Chery A13 models equipped with the 477F engine—always confirm with your vehicle’s VIN! This piston is tailored to fit: its diameter matches the 477F cylinder’s wear tolerance (for engines with slightly worn cylinders), its piston pin hole aligns with the A13’s connecting rod, and its ring grooves fit the factory-spec piston rings (no leaks). A generic piston? You’ll face issues: it’ll be the wrong size (causes gas leaks or seized cylinders), can’t handle the 477F engine’s heat (warps or cracks), or mismatches the connecting rod (breaks during operation).

1. Its practical function: to power and seal the combustion chamber

It completely changes the operation of your A13 engine. Here are its four main functions:

Compressed air-fuel mixture: When the piston moves upward (i.e., the "intake stroke"), it compresses air and fuel into a tiny space at the top of the cylinder. This squeezing makes the fuel burn more powerfully, thereby helping the engine run more efficiently.

Convert fuel into driving power: Once the compressed mixture is ignited (" power stroke "), the piston will gain strength from the fuel explosion and push downward with force. This downward movement causes the crankshaft to rotate (through the connecting rod) - basically converting fuel into the power to drive the car.

Keep the combustion chamber sealed: The piston has a small ring (installed in the groove around it), which is tightly pressed against the cylinder wall. These rings can prevent high-pressure gas from leaking around the piston - if the gas leaks, you will waste power and burn more fuel.

This 477F-1004020BA piston (0.25 oversize) is only for Chery A13 with 477F engines needing repair—wrong fit = engine failure:

Fits These Models: Chery A13 variants with 477F-series engines, where the cylinder has mild wear (the 0.25mm oversize fixes gaps from wear).
Won’t Fit These:

Chery A13 with standard (unworn) 477F cylinders: The oversize piston will be too tight—causes seized cylinders (engine locks up).
Other Chery models (e.g., Tiggo7 Pro, X22 Cross): Their engines (e.g., 1.6T, 473F) have different cylinder sizes/piston designs—no alignment or fit.
Non-Chery vehicles: Even if the piston looks similar, the 477F engine’s piston pin size and compression ratio are unique—mismatch leads to breakage.

Install and maintain it (only the advantages are provided - Engine safety is a big issue!)

Installation: Only certified Chery Technology Company can achieve this

Installing pistons requires absolute precision - if you do it yourself, you'll ruin your engine. Here's how professionals handle it:

Preparing the cylinder: First, technicians grind the 477F cylinder of the A13 flat (this is called "honing") to make it perfectly fit the 0.25mm super-large piston, ensuring there is an appropriate clearance. Then they clean the cylinder to remove any metal fragments.

Assemble the pistons together: They insert the piston rings into the grooves (make sure their spacing is correct), insert the piston rings in (connect the pistons to the connecting rods), and then apply engine oil to the piston rings and the piston rings.

Put it into the cylinder: Using a piston ring compression tool, they gently place the piston into the cylinder so that the piston rings do not bend. Then tighten the connecting rod bolts according to the specifications recommended by Chery.

Testing the engine: They reassembled the top of the engine, started the A13, and checked two things: They used a compression tester to ensure there was no air leakage and listened for strange noises - just to make sure the piston moved smoothly.

Take care of it: Keep the piston running for many years

Use the correct engine oil: Always use the engine oil that Chery says it should be used. The appropriate thickness can keep the piston and ring lubricated, which means less wear.

Change the engine oil in time: Old engine oil contains viscous substances that can scratch the skirt and ring groove of the piston, causing the piston to die faster.

Don't let the engine overheat: If the engine overheats (for example, when your coolant is insufficient), it will cause the pistons to bend and the seals to become disordered. This will lead to leakage and power outages.

Check the compression condition every year: If the compression drops, it indicates that the piston rings are worn. Fix it as soon as possible so that the piston itself won't be damaged.

Company Introduction

Founded in 2011 and based in Jinan, China, Shandong Victory Car Parts Technology Co., Ltd. has established itself as a leading force in the automotive spare parts industry. We specialize in delivering a wide array of high-quality, precision-manufactured components that adhere to the strict standards of China’s top automobile manufacturers. Our comprehensive product range ensures seamless compatibility with numerous vehicle models from well-known brands including Chery, Lifan, Brilliance, JAC, Changan, Dongfeng, MG, Geely, Great Wall, Zotye, Haima, BAIC, FAW, BYD, and many others. Driven by innovation, we consistently invest in research and development to create advanced solutions that enhance vehicle performance, boost durability, and ensure long-term reliability.

477F-1004020BA