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Timing Chain Replacement

  1. Remove timing cover and front pulley. If distance between tensioner head and tensioner body is more than 1/2", replace timing chain or sprockets.
    Fig 1: Timing Chain Tensioner Checking
    G09325832Courtesy of MAZDA MOTORS CORP.
  2. To remove timing chain, remove chain tensioner and vibration damper. Remove oil pump drive gear. See OIL PUMP REMOVAL . Remove bolts from camshaft thrust plate. Remove oil baffle plate and Woodruff key from crankshaft end. Pull camshaft out far enough to remove crank sprocket and timing chain.
  3. Install new timing chain or sprockets correctly timed. See VALVE TIMING . Install camshaft thrust plate and tighten bolts. Install timing chain vibration damper.
  4. Remove plug from chain tensioner. Compress tensioner by turning inner cylinder clockwise with an Allen wrench. Install tensioner in position on motor. Release chain tensioner by turning inner cylinder counterclockwise with an Allen wrench. Install plug and secure with lock tab bent in position.
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