REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
The rocker arm shaft has 12 straight steel rocker arms arranged on it with hardened steel spacers fitted between each pair of rocker arms. The shaft is secured by bolts and steel retainers which are attached to the 7 cylinder head brackets. To remove the rocker arm and shaft:
Inline 6-Cylinder Engines
- Remove the closed ventilation system.
- Remove the evaporative control system (if so equipped).
- Remove the valve cover and its gasket.
- Remove the rocker shaft bolts and retainers.
- Remove the rocker arm and shaft assembly.
- Reverse the above for installation. The oil hole on the end of the shaft must be on top and point toward the front of the engine to provide proper lubrication to the rocker arms. The special bolt goes to the rear. 6-238, 8-318, 8-360, 8-400, 8-4407. Torque all bolts to 25 ft. lbs.
- Temporarily set the intake valve tappet at 0.015" and the exhaust valve at 0.025".
- Run the engine at 550 rpm until it is fully warmed up and adjust the valves.
See Figures 5, 6, 7 and 8
The stamped steel rocker arms are arranged on one rocker arm shaft per cylinder head. Because the angle of the pushrods tend to force the rocker arm pairs toward each other, oilite spacers are fitted to absorb the side thrust at each rocker arm. The shaft is secured by bolts and steel retainers attached to the brackets on the cylinder head. To remove the arm and shaft from each cylinder head:
- Disconnect the spark plug wires.
- Disconnect the closed ventilation system and evaporative control system (if so equipped) from the valve cover.
- Remove each valve cover and gasket.
- Remove the rocker shaft bolts and retainer.
- Remove each rocker arm and shaft assembly. Keep everything in order for installation in the original position.
- Reverse the above for installation. The notch on the end of both 318 and 360 rocker shafts should point to the engine centerline and toward the front of the engine on the left cylinder head and toward the rear on the right side. On the 400 and 440, the rocker arm lubrication holes must point down and toward the valves. Torque the rocker shaft bolts to 17 ft. lbs. on the 318 and 360, and 25 ft. lbs. on the others.
See Figure 9
- Remove the valve cover and gasket.
- Remove the nozzle holders and the glow plug.
- Remove the rocker shaft retaining bolts.
- Remove the rocker arm and shaft assembly. Keep everything in order so the rocker assembly can be installed in the original position.
- To install, position the rocker arm and shaft assembly so the bracket with the oil hole is at the front of the engine.
- Install the rocker shaft retaining bolts and tighten them to 90 ft. lbs.
- Install the nozzle holders and the glow plugs.
- Install and tighten the injection lines. Tighten the nozzle holder retaining nuts to between 36 ft. lbs.
- Adjust the valves.