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SERIES 60 ROCKER ARM SHAFT PLUGS MISSING (NEW OR REBUILT ENGINES ONLY)

If engine is not new or has not been rebuilt, refer to section . ‪

To determine if a missing rocker arm shaft plugs are causing low oil pressure, perform the following steps: ‪

  1. Remove the rocker arm cover; for one-piece refer to section , for two-piece refer to section , for three-piece refer to section .
  2. Visually inspect the rocker arm shaft for missing or leaking shaft plugs.
    1. If the shaft plugs are present and are not leaking, check the oil cooler for restriction; refer to section .
    2. If the shaft plugs are missing, refer to section .
    3. If the shaft plugs are leaking, refer to section .

Leaking Rocker Arm Shaft Plug Repair

Perform the following steps to repair leaking rocker arm shaft plugs: ‪

  1. Remove damaged shaft plugs; refer to section .
  2. Inspect rocker arm shaft for damage; refer to section . If damage is found, replace the rocker arm shaft; refer to section .
  3. Install new shaft plugs; refer to section .

    Note: Shaft plug must be installed 1.0 - 1.3 mm (0.040 -0.050 in.) below surface using J 36236 .

  4. Install rocker arm cover; refer to section .
  5. Verify repair made to the rocker shaft plugs; refer to section .

Missing Rocker Arm Shaft Plug Repair

Perform the following steps to repair missing rocker arm shaft plugs: ‪

  1. Inspect rocker arm shaft for damage; refer to section . If damage is found, replace the rocker arm shaft; refer to section .
  2. Install new shaft plugs; refer to section .

    Note: Shaft plug must be installed 1.0 - 1.3 mm (0.040 -0.050 in.) below surface using J 36236 .

  3. Install rocker arm cover; refer to section .
  4. Verify repair made to the rocker shaft plugs; refer to section .
Test Engine with Repaired Rocker Shaft Plugs

Perform the following steps to determine if repaired rocker shaft plugs resolved low oil pressure: ‪

  1. Install the Diagnostic Data Reader to the vehicles Display Data Line Adaptor, see Figure 24089 ; refer to OEM guidelines.
  2. Start and run engine speed at 1800 r/min.
  3. Visually examine the DDR for oil pressure reading.
    1. If the DDR indicates 241 kPa (35 lb/in.2 ) or more at 1800 r/min, shut down the engine and disconnect the DDR. No further troubleshooting is required.
    2. If the DDR indicates less than 241 kPa (35 lb/in.2 ) at 1800 r/min, shut down the engine and disconnect the DDR. Check the oil cooler for restriction; refer to section .