Rocker Arm Assembly: Service and Repair

ROCKER ARM

REMOVAL





1. Remove cylinder head cover.





2. Install pushrod retaining plate (1)special tool 9070.





3. Loosen the rocker shafts using the sequence provided.

CAUTION: The rocker shaft assemblies are not interchangeable between intake and exhaust. The intake rocker arms are marked with an "I".

4. Remove the rocker shafts. Note location for reassembly.

CAUTION: The longer push rods are for the exhaust side, and the shorter push rods are for intake side.





5. Remove the pushrods. Note pushrod location for reassembly.

CAUTION: Do not remove the retainers from the rocker shaft. The assembly tangs (1) at the bottom of the retainers (2) can be damaged, causing the assembly tangs to break off, and get into the engine.

INSTALLATION





CAUTION: The longer push rods are for the exhaust side, and the shorter push rods are for intake side.

1. Install the push rods in the same order as removed.





2. Install the pushrod retaining plate (1) special tool 9070.

CAUTION: Ensure that retainers (2) and rocker arms (4) are not overlapped when torquing bolts.

CAUTION: Verify that pushrod is installed into rocker arm (4) and tappet correctly while installing rocker shaft assembly. Recheck after rocker shaft has been torqued to specification.





CAUTION: The rocker shaft assemblies are not interchangeable between intake and exhaust. The intake rocker arms are marked with the letter "I".

3. Install rocker shaft assemblies in the same order as removed.
4. Tighten the rocker shaft bolts to 22 Nm (195 inch lbs.) torque, using the sequence provided.

CAUTION: DO NOT rotate or crank the engine during or immediately after rocker arm installation. Allow the hydraulic roller tappets adequate time to bleed down (about 5 minutes).





5. Remove pushrod retaining plate (1) special tool 9070.





6. Install cylinder head cover.