1.3 VALVE AND INJECTOR OPERATING MECHANISM Inspect the rocker arm assemblies and camshaft lobes as follows: 1. Inspect the rocker arm shaft bushing surfaces and rocker arm bushing bores. [a] Check the rocker arm shaft bushing surfaces and rocker arm bushing bores for wear or scoring. If damage was found, replace component. [b] If no damage was found, reuse component. 2. Inspect the cam follower rollers. [a] Check the cam follower rollers for scoring, pitting, or flat spots. If damage was found, replace the component. [b] If no damage was found, reuse component. 3. Check the cam follower rollers to ensure they turn freely on the roller pins.
[a] Clearance between the rollers and pins should not be more than 0.08 mm (0.003 in.). [b] Replace as necessary. 4. Inspect the camshaft lobes and journals. [a] Check the camshaft lobes and journals for scoring, pitting, or flat spots. If damage was found, replace the component. [b] If there is doubt as to the acceptability of the camshaft for further service, determine the extent of camshaft lobe wear. Refer to section 1.28.3.1. 5. Inspect the valve adjusting screw assemblies. [a] If former style valve adjusting screw assembly is damaged; replace with new unitized valve adjusting screw assembly. NOTE: Replace with unitized valve adjusting screw assembly of the correct position.
[b] If any damage is found on the unitized valve adjusting screw assembly; replace with new unitized screw assembly. [c] If no damage is found on the former style valve adjusting screw or on the new unitized valve adjusting screw assembly; reuse the components. NOTE: Former style valve adjusting screw assemblies and the unitized valve adjusting screw assemblies are interchangeable and can be mixed in the same engine. (Rev. 2005) All information subject to change without notice. 1-74 6SE483 0507 Copyright © 2005 DETROIT DIESEL CORPORATION