Measuring Timing Chain Wear
STANDARD PROCEDURE - MEASURING TIMING CHAIN WEARNOTE: This procedure must be performed with the timing chain cover removed.
1) Position a scale next to timing chain so that any movement of chain may be measured (Fig. 173).
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:
- 41 Nm (30 ft. lbs.) with cylinder heads installed
- 20 Nm (15 ft. lbs.) 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 (Fig. 173).
4) Apply force in the reverse direction to the following torque:
- 41 Nm (30 ft. lbs.) with cylinder heads installed
- 20 Nm (15 ft. lbs.) 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 inch).