Measuring Timing Chain Wear

(1) Place a scale next to timing chain so that any movement of chain may be measured.
(2) Place a torque wrench and socket on camshaft sprocket attaching bolt and apply torque in direction of crankshaft rotation to take up slack; 41 Nm (30 ft. lbs.) with cylinder head installed or 20 Nm (15 ft. lbs.) with cylinder heads removed. With a torque applied to the camshaft sprocket bolt, crankshaft should not be permitted to move. It may be necessary to block crankshaft to prevent rotation.





Fig. 37

(3) Hold a scale with dimension reading even with edge of a chain link. Apply torque in the reverse direction 41 Nm (30 ft. lbs.) with cylinder heads installed, or 20 Nm (15 ft. lbs.) with cylinder heads removed. Note the amount of chain movement (Fig. 37).
(4) If movement exceeds 3.175 mm. (1/8 inch), replace timing chain and sprockets.