Home » Duramax LLY » Duramax LLY – ROCKER ARM, SHAFT, AND PUSHROD SERVICE – Installation


1. Lubricate all parts with engine oil, or with a quality assembly lube.

2. Install pushrods in same sequence as when removed.
Verify that heat treated or coated end is facing up toward rocker arm.

3. Assemble rocker arms and shaft if necessary. Secure arms with new retainers but be sure reused arms are installed on same shafts and in same position. Do not intermix parts.

4. Index crankshaft and pistons for rocker arm shaft installation as follows:
a. Position breaker bar and socket on crankshaft damper bolt. Do not use starter to rotate crankshaft. Turn shaft with hand tools only.
b. Rotate crankshaft counterclockwise, and align mark on torsional damper with ÒOÓ mark on front cover timing tab.
c. Rotate engine counterclockwise an additional 3 1/2 inches (89 mm), measured at mark on torsional damper. Damper mark should align with water pump first, lower attaching bolt at this point (Figure 2-43).

5. Align and install rocker arm and shaft assemblies (Figure 2-36). Be very sure pushrods are seated in lifters and in rocker arms.

6. Install rocker arm shaft retainers and bolts. Tighten bolts in small increments until snug, with socket and ratchet or nut runner.
CAUTION: Do not use an air wrench to tighten the bolts. In addition, stop tightening if the bolts become hard to turn before they are seated. If this condition occurs, the crankshaft and pistons are not properly indexed, allowing the valves to contact the pistons.

7. Verify that pushrods are properly seated in rocker arms and lifters. Then final-tighten rocker arm shaft bolts to 41 lb-ft (56 N.m) torque.

8. Install rocker covers and intake manifold as described in this section.


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