Rocker Arm Assembly: Service and Repair

Removal Procedure

Important: Rotate the engine until the mark on the crankshaft balancer is at the 2 o'clock position.

Rotate the crankshaft counter clock wise 88 mm (3 1/2 inch), aligning the crankshaft balancer mark with the first lower water pump bolt, about 12:30.
This will position the engine so that no valves are close to the piston crown.
1. Disconnect the battery negative cable from the battery.
^ For the front battery, refer to Battery Cable Replacement (Battery Cable Negative) in Starting and Charging.
^ For the auxiliary battery, refer to Battery Cable Replacement (Battery Cable Aux. Negative) in Starting and Charging.

2. Remove the engine cover from the vehicle.
3. Remove the upper intake manifold from the vehicle.
4. Remove the lower intake manifold from the cylinder heads.
5. Remove the valve rocker arm cover from the cylinder head.





6. Remove the valve rocker arm shaft bolt from the cylinder head.





7. Remove the valve rocker arm shaft with the valve rocker arm.

Important: All valve train components must be stored in the position that they were removed to insure proper installation.





8. Remove the push rods from the engine block.





9. Use a pair of pliers to break off the end of the nylon valve rocker arm retainers from the valve rocker arm shaft.
10. Remove the valve rocker arm retainers with a pair of pliers.
11. Slide the valve rocker arms from the rocker arm shaft.
12. Inspect each of the valve train components.

Installation Procedure

Notice: All valve train components must be reassembled in the exact order and position from which they were removed.

Important: The push rods must be installed in the original direction as disassembly. This is because the push rods have different degrees of hardness at each end. A paint stripe identifies the upper end of the push rod. If the paint stripe is not visible, mark the push rod on the upper end as the push rods are removed.

Important: Lubricate the valve rocker arms with clean engine oil before installing.

Notice: Install the valve pushrods with the copper-colored, painted, or marked end up in order to avoid damage or premature wear.





1. Install the push rod, with the painted or marked end up to the engine block.
2. Install the valve rocker arms to the valve rocker arm shaft (one type of valve rocker arm is used at all locations) to the cylinder head.
3. Install the valve rocker arm retainers to the cylinder head.
4. Center the valve rocker arm on the corresponding holes in the valve rocker arm shaft.
5. Use a drift of at least 13 mm (1/2 inch) in diameter to install new retainers to the valve springs.

Notice: Improper installation of the valve rocker arm shaft bolts may cause valve rocker arm shaft breakage and piston to valve contact.





6. Install the valve rocker arm shaft assembly to the cylinder head.

Notice: Refer to Fastener Notice in Service Precautions.





7. Install the valve rocker arm shaft bolts to the cylinder head.
^ Tighten the bolts to 55 Nm (40 ft. lbs.).
8. Install the valve rocker arm cover to the cylinder head.
9. Install the valve rocker arm cover to the cylinder head.
10. Install the lower intake manifold to the cylinder head.
11. Install the valve rocker arm cover to the cylinder head.
12. Install the upper intake manifold to the turbo charger.
13. Install the engine cover in the vehicle.
14. Connect the battery negative cables to the batteries.