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TCK284 FAI TIMING CHAIN KIT For AUDI A6 (4B2 C5) 4.2 quattro (ASG) 11/98-01/05There is a general misconception that a timing chain will last for the life of a vehicle. However, chains, sprockets and other components will stretch or wear over time, especially if the vehicle is poorly maintained. When replacing one engine timing component, it is best practice to replace all associated parts. The argument for replacing A snapped or stretched timing chain can cause major damage to cylinder head components in modern ‘interference’ engines, when valves and pistons can smash into each other. As well as inspecting the chain assembly for signs of wear, the owner or mechanic should listen for a change in engine note. If the engine sounds ‘rough’, it may be a sign that timing accuracy has deteriorated. Adhering to regular service intervals and inspecting the oil for excessive metal debris during oil changes is also highly recommended. Whenever changing the chain, the following must also be considered: Chain guides - guide arms keep the chain in line as it revolves. Worn guides cause the chain to jump from the sprockets, or slacken or loosen with destructive results. Tensioners - designed to maintain tension and prevent slack, a faulty tensioner can lead to sudden failure by creating a wave of slack that disrupts valve timing. It can even snap the chain. Sprockets - worn teeth cause the chain to jump, or even derail, compromising timing accuracy. This results in power loss and risks valve and piston ‘interference’. To ensure best practice is followed, BGA recommends replacing all associated parts when working on engine timing components.