Timing Chain: Service and Repair

Remove or Disconnect
1. Front cover. Refer to "Front Cover Replacement".

Measure
^ Timing chain free play as follows.
^ Mount a dial indicator to the front of the block.
^ Position the dial indicator so that the plunger contacts the timing chain between the two gears.
^ Pull the chain outward (parallel to the front face of the block) the maximum amount with finger pressure on the inside of the chain.
^ Set the dial indicator to zero.
^ Move the chain inward (parallel to the front face of the block) the maximum amount with finger pressure on the outside of the chain.
^ The total indicator travel can be noted. With used parts, the deflection must not exceed 20.3 mm (0.600 inch). If the deflection exceeds this limit, the sprockets and timing chain must be inspected for wear and replaced as necessary. With new parts the maximum deflection must not exceed 12.7 mm (0.500 inch).

2. Injection pump gear.





3. Camshaft gear.
^ Align the timing marks.

4. Camshaft sprocket with timing chain.
5. Crankshaft sprocket.

Install or Connect
1. Crankshaft sprocket.
2. Camshaft sprocket with timing chain.

Important





^ Align the timing marks.

3. Camshaft gear, bolt, and washer.

Tighten
^ Bolt to 100 N.m (75 ft. lbs.).

4. Injection pump gear and bolts.

Important





^ Align the timing marks.

Tighten
^ Bolts to 23 N.m (17 ft. lbs.).

5. Front cover. Refer to "Front Cover Replacement".

Adjust
^ Injection pump timing, if new gears, sprockets, or timing chain were installed. Refer to DIESEL FUEL INJECTION.