M11 Series – Service Manual – 004-014   Push Rods or Tubes

Remove the air piping from the intake manifold.

Remove the rocker lever cover. Refer to Procedure 003-011.

Remove the engine brakes, if applicable. Refer to Procedure 020-001.

NOTE: Mark the position of the valve push tubes and injector push rods as they are removed. The push tubes and push rods must be installed in the same positions when the engine is assembled.

Loosen the rocker lever adjusting screws, and remove the valve push tubes and injector push rods.

Hold the push tubes and push rods while loosening the adjusting screws. Do not let them fall into the engine while rotating the accessory drive pulley.

NOTE: Some push tubes and rods are under compression because the valves are open. Rotate the crankshaft clockwise with the accessory drive pulley to relieve the spring tension.

Inspect the straightness of the push tubes and push rods by rolling them on a level bench. If any push tube or push rod is bent, it must be replaced.

Inspect the ball-and-socket ends for uneven wear or scratches.

Check the push tubes for oil. If the push tubes are filled with oil, they must be replaced.

Inspect the seating pattern in the socket for excessive wear.

Inspect the ball end for excessive wear.

If excessive wear is found on the ball end, the cam follower sockets must be inspected. Refer to Procedure 007-009. Use the Overhead Reuse Guidelines, Bulletin 3810388, to identify wear patterns and excessive wear.

Replace all parts that do not meet the reuse guidelines.

Use clean 15W-40 oil to coat the ball end of the push tubes and push rods.

NOTE: The injector push rods (l) are smaller in diameter and longer than the valve push tubes (V).

Install the valve push tubes and injector push rods.

Position the push tubes and push rods under the rocker lever adjusting screws.

Tighten the adjusting screws enough to hold the push tubes and push rods in position.

Adjust the valves and injectors. Refer to Procedure 003-004.

Install the engine brakes, if applicable. Refer to Procedure 020-001.

Install the rocker lever cover. Refer to Procedure 003-011.

Install the air piping to the intake manifold. Refer to the manufacturer’s specifications for the correct torque.