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Home›Repair guides›Camshaft and Rocker Shaft Assemblies Removal

Detroit Diesel — Camshaft and Rocker Shaft Assemblies Removal

A Detroit Diesel service procedure — check it applies to your exact model before use.

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Before you start

  • Ensure when loosening the rocker shaft bolts that the bolts are loosened from the inside bolts outward in 1/2 turn increments. The increment procedure needs to be followed to prevent the rocker shaft from breaking.
  • The engine brake solenoids do not have to be removed unless damaged.

Procedure

  1. Steam clean the engine.
  2. Remove pipe, air cleaner and turbocharger inlet hose.
  3. Remove air cleaner housing.
  4. Remove eight bolts from air cleaner bracket and remove bracket.
  5. Remove nineteen bolts from rocker cover and remove rocker cover.
  6. Remove the injector harness.
  7. Rotate the engine to top dead center (TDC) on cylinder No. 1.
  8. Remove the Crankshaft Position Sensor (CKP) from the rear of the flywheel housing.
  9. Install flywheel housing TDC locating pin (W470589001500) into the CKP hole located in the rear of the flywheel housing.
  10. Loosen the seven bolts securing the intake rocker shaft to the camshaft caps. Loosen from inside bolts outward in 1/2 turn increments.
  11. Using rocker arm lifter spacer tool (W470589004000), remove the intake rocker shaft assembly.
  12. Loosen the seven bolts securing the exhaust rocker shaft to the camshaft cap. Loosen from inside bolts outward in 1/2 turn increments.
  13. Using rocker arm lifter spacer tool (W470589004000), remove the exhaust rocker shaft assembly from the camshaft cap.
  14. Remove the remaining bolts from the camshaft caps using J-48883.
  15. Remove the intake and exhaust camshaft assemblies from the camshaft housing.

Tools required

  • steam cleaner
  • TDC locating pin W470589001500
  • rocker arm lifter spacer tool W470589004000
  • J-48883
  • torque wrench

Specs & torque values

  • 7 bolts securing intake rocker shaft
  • 7 bolts securing exhaust rocker shaft
  • Crankshaft Position Sensor (CKP)

Source: manual:08DD151 - Revision to Camshaft and Rocker Shaft Assembly Sections.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.