Cummins ISX11.9 CM2250 – Service Manual 004-014   Push Rods or Tubes

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to the OEM service manual.
• Remove the rocker lever cover. Refer to Procedure 003-011 in Section 3.
• Remove the engine brakes, if applicable. Refer to Procedure 020-024 in Section 20.

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

Hold the push tubes while loosening the adjusting screws. Do not let the push tube fall into the engine while barring the engine.

NOTE: Some push tubes and rods are under compression because the valves are open. Rotate the crankshaft clockwise to relieve the spring tension. Refer to Procedure 009-035 in Section 9.

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 004-001 in Section 4.

Replace all parts that do not meet the reuse guidelines.

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

Install the valve push tubes.

Position the push tubes under the rocker lever adjusting screws.

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

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Adjust the overhead. Refer to Procedure 003-004 in Section 3.
• Install the engine brakes, if applicable. Refer to Procedure 020-024 in Section 20.
• Install the rocker lever cover. Refer to Procedure 003-011 in Section 3.
• Connect the batteries. Refer to the OEM service manual.
• Operate the engine to normal operating temperature and check for leaks.