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Measuring Timing Chain Wear

Fig 1: Timing Chain Marks
GC0049781Courtesy of CHRYSLER LLC
1 - CAMSHAFT SPROCKET TIMING MARK (DOT)
2 - PLATED LINK
3 - CRANKSHAFT SPROCKET TIMING MARK (DOT)
4 - ARROWS
NOTE: This procedure must be performed with the timing chain cover removed. See REMOVAL .
  1. Position a scale next to timing chain so that any movement of chain may be measured.
  2. Position a torque wrench and socket on the camshaft sprocket attaching bolt. Apply force in the direction of crankshaft rotation to take up slack to the following torque:
    1. 41 N.m (30 ft.lb.) with cylinder heads installed
    2. 20 N.m (15 ft.lb.) with cylinder heads removed
    NOTE: With torque applied to the camshaft sprocket bolt, crankshaft should not be permitted to move. It may be necessary to block crankshaft to prevent rotation.
  3. Holding a measuring scale along edge of chain links.
  4. Apply force in the reverse direction to the following torque:
    1. 41 N.m (30 ft.lb.) with cylinder heads installed
    2. 20 N.m (15 ft.lb.) with cylinder heads removed
  5. Measure amount of sprocket/chain movement.
  6. Install a new timing chain and sprockets if movement exceeds 3.175 mm (1/8 in.).
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