1.3 VALVE AND INJECTOR OPERATING MECHANISM 1.3 VALVE AND INJECTOR OPERATING MECHANISM The valve and injector operating mechanism is located entirely in the cylinder head. The Series 60 overhead camshaft design eliminates the need for push rods. Separate camshaft followers are not needed, since the rocker arms incorporate follower rollers riding directly on the camshaft lobes, transmitting camshaft motion to the valves and injectors. See Figure 1-47. Figure 1-47 Camshaft and Related Parts Each of the three rocker arm assemblies contain bushings where the rocker arms are supported on the rocker arm shafts. These bushings are not serviced separately.
Each intake rocker arm assembly operates two intake valves in each cylinder. Each exhaust rocker arm assembly operates two exhaust valves in each cylinder. In each set of rocker arm assemblies, the exhaust rocker assembly is the widest, straddling the intake and fuel injector rocker arm assembly. The center rocker operates the fuel injector follower. See Figure 1-48. Figure 1-48 Rocker Arm Identification (Rev. 2005) All information subject to change without notice. 1-60 6SE483 0507 Copyright © 2005 DETROIT DIESEL CORPORATION