■ The chain repair kit consists of timing chain, tensioner, chain stopper, camshaft, sprocket, gear and so on.
■ The timing chain matches the rotation of the crankshaft and camshaft, ensuring proper timing and regulating the opening and closing of the engine’s valves as each cylinder initiates. The timing chain resides inside the engine and requires lubrication with oil provided by the engine.
■ Tensioner refers to the retaining device commonly employed in chain transmission system, which is characterized by maintaining the proper tensioning force of the chain in the transmission process, and thereby eliminating chain slipping or chain disengagement due to chain slippage. There are various structures of tensioners, generally comprising fixed structures and elastic self-adjusting structures.

■ The chain is made up of chain plates and pins, where the plates are connected by the pins and possess the characteristics of strong tensile strength, prolonged service life and superior transmission and weight bearing performance. The steel of the chain consists of 38CrMoAl and GCr15, featuring strong surface hardness, wear resistance and fatigue intensity, as well as favorable heat resistance and corrosion resistance.

■ Normally, the tensioner shell adopts iron or aluminum material for the purpose of guaranteeing the sturdiness of the shell. Tensioner critical parts have been tested for 100% performance, of which each batch of springs is sampled for fatigue test testing to ensure stable buffer function and high ejection force based on its distinctive principle and structure.

■ Guide rail: sophisticated injection mold, guaranteeing full compliance with the design requirements of the contour and size, high-intensity mechanical and impact resistance, high performance stability. The abrasion resistant surface layer of guide rail adopts Japan Asahi Kasei material, featuring high fluidity, short-term molding cycle, high-impact toughness and extraordinary abrasion resistance.

■ Generally, the gears and VVT adopt two materials, powder metallurgy or 45# steel, where the tensile strength is >686MPa and yield strength is >490MPa.
■ Camshaft phaser/VVT: 1:1 development of original OE parts, with leading-edge testing and manufacturing equipment.

1. High precision tensioner performance test platform.
2. VVT independent air pressure tester.
3. VVT independent oil pressure tester.
4. OCV valve performance test platform.

1. In case of timing chain failure, it will deteriorate the engine. A new timing chain will lower the engine noise and guarantee the engine lifespan.
2. In case the camshaft and crankshaft, gears and sprockets are broken, the engine will produce a lot of noise and a new camshaft and crankshaft, gears and sprockets are required to guarantee the normal functioning of the engine.

3. Tensioner is a fastening device in the chain drive series, which is necessary to be inspected and replaced by a new one periodically, so as to prevent the chain from skipping, slipping, slippage and detachment of gears.
4. The material of the guide rail will be aged when it is used excessively long. New guide rail should be replaced on time to avoid engine malfunction and to ensure the normal operation of the chain.
5. For convenience of installation, each chain is identified by a timing chain mark. It is critical to understand the timing marks of the crankshaft and camshaft when replacing the timing chain or adjusting the timing of a vehicle to get it correct.

1. Brush off the oil and mud from the chain surface and chain gap with a cleaning brush.
2. Wipe the chain surface with a dry cloth with a little neutral cleaner.
3. Wipe the chain with professional chain cleaner.
4. Note: Do not soak the chain in organic solvents such as kerosene, diesel, etc., which are not professional cleaners. kerosene, diesel and stain removal oil are too volatile. Soaking the chain with these oils will dilute the original lubricant inside the chain and cause the inner ring to dry out and wear, resulting in a shorter chain life.
5. Do not apply harsh acids or strong alkaline cleaners, for example rust remover, as these substances can damage or even destroy the chain.
6. Except for any particular issues, the timing chain normally requires replacement at around 130,000 to 200,000 km.