GM Genuine Parts Engine Timing Chain Tensioners are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Some timing chains are mounted in a fixed position on the crank and camshaft gears and cannot be adjusted. As these chains wear, slack in the chain increases and alters the valve timing of the engine. These chains must be replaced when excessive slack appears. Other timing chain assemblies use tensioners that maintain a consistent amount of tension within the timing chain as the chain wears, reducing the effect that slack has on the valve timing of the engine. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

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• Keep vehicle running in proper time
• Helps prevent wear to timing sprockets and chain
• Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
• GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
• GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
• GM regularly updates production and service part designs to integrate new materials and technologies
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