Cylinder Head and Valves
02
020
21
RG,RG34710,71 –19–30SEP97–1/1
Disassemble and Inspect Rocker Arms and
Shaft Assembly
RG8395 –UN–21MAY98
Measure Rocker Arm Shaft
RG8392 –UN–21MAY98
Measure Rocker Arm Bushing
RG8390 –UN–21MAY98
Measure Rocker Arm Roller
1. Remove rocker arms from shaft and identify for
installation in same position as removed.
2. Inspect rocker arm shaft for scoring and excess wear
at rocker arm contact points. Roll on a flat surface and
check for bends or distortion.
3. Check rocker arm adjusting screws and lock nuts for
thread damage.
4. Check valve bridges and push tubes for contact wear.
5. Clean all parts with clean solvent. Dry with compressed
air.
6. Measure rocker arm shaft OD and rocker arm bushing
ID. Compare measurements with specifications below.
7. Inspect rocker arm roller for uneven wear. Measure
roller OD and compare with specifications below.
Specification
Rocker Arm Bushing—ID 38.064 ± 0.013 mm (1.4986 ±
0.0005 in.)
...........................
Rocker Arm Shaft—OD 38.000 ± 0.013 mm (1.4961 ±
0.0005 in.)
..............................
Rocker Arm Shaft-to-Bushing—
Oil Clearance 0.064 ± 0.026 mm (0.0025 ±
0.0010 in.)
................................................
Rocker Arm Shaft Intake and
Exhaust Roller—OD 39.995—40.045 mm
(1.5746—1.5766 in.)
..................................................
Rocker Arm Shaft Unit Injector
Roller—OD 37.995—38.045 mm
(1.4959—1.4978 in.)
................................................................
Replace parts as necessary.
CTM100 (06APR04)
02-020-21
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=93
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