SERIES 60 SERVICE MANUAL A new injector rocker arm assembly replaced the former injector rocker arm assembly on all model 6067-GK60 engines beginning with serial number 06R0133091, and on all model 6067-GU60 and 6067-WU60 engines beginning with serial number 06R0157655. NOTE: When the current rocker is installed on a phosphated shaft, the shaft should be turned 180° to present a fresh phosphated area to the loaded region of the bushing. The current assembly has a honed rocker arm shaft bushing, a ceramic cam follower and a new phosphated (black in color) rocker arm shaft which provides improved wear characteristics.
The phosphated surface is required for the proper break-in of the steel rocker arm shaft bushings. Current Series 60 engines have rocker arm shafts without flats at the mounting bolt locations. For these engines, a spacer is installed between the rocker arm shaft and the mounting bolts or nuts rather than a washer. This allows the rocker arm shaft to be rotated when installing new rocker arms. When reusing rocker arm assemblies, the rocker arm shaft should not be rotated so that the same surfaces of the rocker arm assemblies and rocker shafts are in contact with each other.
Vertical oil passages at the front and rear of the cylinder head deliver oil from the cylinder block front and rear oil galleries to the No. 1 and 7 lower camshaft bearing saddles. From there, the oil is directed upward (through the enlarged stud hole) to the No. 1 and 7 upper bearing caps. A drilled passage in each of these caps exits at the rocker arm shaft seat area, where it indexes with a hole in each rocker arm shaft. The rocker arm shafts have internal oil passages that deliver oil to the rocker arm bushings and intermediate upper camshaft bearings. Some of the oil supplied to the rocker arm bushings passes through the oil hole in the bushing to the rocker arm assemblies.
The rocker arm assemblies contain drilled passages that supply oil to the camshaft roller follower, the roller pin and the bushing. The rocker arm assemblies also contain drilled passages that supply oil to the unitized valve adjusting screw assembly and exhaust valve stems and the fuel injector follower. NOTE: In December 2000, a new unitized adjusting valve screw assembly now replaces the former valve adjusting screw, valve button and retainer clip. The No. 4 camshaft cap is "Y" drilled, forming an oil path connection between the front and rear rocker arm shafts, to ensure complete lubrication. The oil passage within one rocker arm cylinder set is shown.
See Figure 1-51 and see Figure 1-52. All information subject to change without notice. (Rev. 2005) 6SE483 0507 Copyright © 2005 DETROIT DIESEL CORPORATION 1-63