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Home›Repair guides›Camshaft and Rocker Shaft Assemblies Installation

Detroit Diesel — Camshaft and Rocker Shaft Assemblies Installation

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

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Before you start

  • The camshaft journal area is lubricated by oil that has to travel through the rocker shaft. If the rocker shaft is installed incorrectly, oil passages do not line up. This results in insufficient lubrication and damage to the camshaft journals. Incorrect shaft installation may also result in the engine brakes not functioning and cause damage to the rocker arm bushings.
  • The camshaft caps are numbered and need to be installed correctly.
  • Ensure when tightening the rocker shaft bolts that the bolts are drawn down from the inside bolts outward in 1/2 turn increments, before final torque. If the rocker shaft bolt is fully torqued without using the increment procedure the rocker shaft can break.

Procedure

  1. Verify that the crankshaft is at top dead center (TDC) on cylinder No.1 using tool (W470589001500) installed in CKP hole.
  2. Remove flywheel housing TDC locating pin (W470589001500) from CKP sensor hole in the rear of the flywheel housing.
  3. Install camshaft timing tool (W470589024000) to the rear of the camshaft housing. Tighten the two bolts.
  4. Locate the etched triangle on the camshaft gear teeth and mark the teeth with a paint pen.
  5. Lubricate the lower camshaft bearing surfaces and camshaft journals before installation of the camshafts. Install the exhaust and intake camshaft gear assemblies onto camshaft housing caps.
  6. Align the marked gear teeth with the marks on the timing tool.
  7. Install timing tool (W470589024000) to the front of the camshaft frame and into the grooves cut into the camshafts. Secure timing tool to the camshaft with a bolt. At this point the front timing tool should slide into the camshaft grooves easily with no drag. If there is excessive drag when installing the tool the camshafts are out of time.
  8. Verify that the marks on the gear teeth match the marks on the timing tool.
  9. Install a dial indicator onto gear case and zero out the dial indicator.
  10. Position the stem of dial indicator to rest between the teeth on the camshaft gear.
  11. Hold the No. 5 idler gear with a screw driver. Check the lash between the camshaft gear and idler gear No. 5. The dial indicator should read 0.051-0.257 mm (0.002002-0.01010 in.).
  12. Install the seven camshaft caps onto intake and exhaust camshafts. The first and seventh camshaft caps hold the engine brake solenoid to camshaft cap. Replace the O-rings on the solenoid prior to reinstallation. Install the engine brake solenoid.
  13. Install the 28 bolts to camshaft caps and finger tighten the bolts.
  14. Torque fourteen 120 mm M10 camshaft cap bolts and seven 108 mm M10 bolts to 20 N·m (15 lb·ft) and then torque to 50-55 N·m (37-40 lb·ft) using torque sequence shown in documentation.
  15. Torque the seven 63 mm M8 bolts to 30 N·m (22 lb·ft) using the torque sequence shown.
  16. Using tool (W470589004000), install the assembled intake rocker arm assembly to the camshaft cap and secure with seven clamping blocks and bolts. Torque the bolts to 55-60 N·m (41-44 lb·ft) 90 degrees.
  17. Using tool (W470589004000), install the assembled exhaust rocker arm assembly to the camshaft cap. Torque the bolts to 55-60 N·m (41-44 lb·ft) 90 degrees.
  18. Install the injectors and harness.
  19. Lash the valves and engine brakes.
  20. Install the rocker cover.
  21. Install air cleaner bracket with eight bolts.
  22. Install air cleaner housing.
  23. Install pipe, air cleaner and turbo inlet hose.
  24. Install CKP.

Tools required

  • camshaft timing tool W470589024000
  • TDC locating pin W470589001500
  • paint pen
  • dial indicator
  • screw driver
  • rocker arm lifter spacer tool W470589004000
  • torque wrench

Specs & torque values

  • 14 M10 camshaft cap bolts (120 mm): torque to 20 N·m then 50-55 N·m
  • 7 M10 camshaft cap bolts (108 mm): torque to 20 N·m then 50-55 N·m
  • 7 M8 camshaft cap bolts (63 mm): torque to 30 N·m
  • Intake and exhaust rocker arm assembly bolts: torque 55-60 N·m at 90 degrees
  • Camshaft gear lash: 0.051-0.257 mm (0.002002-0.01010 in.)

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.