RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
Timing Chain: Service and Repair
Measuring Timing Chain Stretch
NOTE: Timing chain tensioner must be removed for this operation.
1. Place a scale next to the timing chain so that any movement of the chain can be measured.
2. Place a torque wrench and socket over camshaft sprocket attaching bolt. Apply torque in the direction of crankshaft rotation to take up slack; 41
Nm (30 ft. lbs.) torque with cylinder head installed or 20 Nm (15 ft. lbs.) torque with cylinder head removed. With torque applied to the camshaft
sprocket bolt, crankshaft should not be permitted to move. It may be necessary to block the crankshaft to prevent rotation.
Measuring Timing Chain Wear And Stretch
3. Hold a scale with dimensional reading even with the edge of a chain link. With cylinder heads installed, apply 14 Nm (30 ft. lbs.) torque in the
reverse direction. With the cylinder heads removed, apply 20 Nm (15 ft. lbs.) torque in the reverse direction. Note the amount of chain movement.
4. Install a new timing chain, if its movement exceeds 3.175 mm (1/8 inch).
