1.2 Cylinder Head
DETROIT DIESEL 53
shaft on the valve rocker arms is longer on one side of the arm than on the other.
The extended boss of the valve rocker arms must face the injector rocker arm.
Install Rocker Arms and Rocker Arm Shaft
Install the cylinder head, if removed, as outlined in Section 1.2.
Apply clean engine oil to the surface of the rocker arm shaft.
3. Install the rocker arms and rocker arm shaft by reversing the sequence of operations for removal. Tighten the
rocker arm shaft bracket bolts to 50-55 lb-ft torque. After tightening the bolts, check for some side clearance to prevent
bind between the rocker arms.
CAUTION: On four valve cylinder heads, there is a possibility of damaging the
exhaust valves if the valve bridges are not resting on the ends of the valves
when tightening the rocker arm shaft bracket bolts (Fig. 12). Therefore, note the
position of the exhaust valve bridges before, during and after tightening the
rocker arm shaft bracket bolts.
4. Align the fuel pipes and connect them to the injectors and the fuel connectors. Tighten the fuel pipe nuts to 12-15 lb-
ft torque with socket J 8932-01.
CAUTION: Do not bend the fuel pipes and do not exceed the specified torque.
Excessive tightening will twist or fracture the flared ends of the fuel pipes and
result in leaks. Lubricating oil diluted by fuel oil can cause serious damage to
Fill the cooling system.
6. Adjust the exhaust valve clearance and time the fuel injector as outlined in Section 14.1 and 14.2 before starting the
Start the engine and check for leaks in the fuel, cooling and lubrication systems.
Tune-up the engine, as outlined in Section 14, after the engine reaches normal operating temperature.