Yanmar 3TNV82A Service Manual page 164

ENGINE
3. Use a feeler gauge to measure the gap
(Figure 6-13). See Push Rod on page 6-8 for
the service limit.
Figure 6-13
Inspection of Rocker Arm Assembly
Rocker Arm Shaft Hole Diameter
Use a test indicator and micrometer to determine if
the inside diameter of all the rocker arm support
brackets and the rocker arms (Figure 6-14) are
within the specified limits. See Rocker Arm and
Shaft on page 6-9 for the service limit.
Inspect the contact areas (Figure 6-14, (1)) for
excessive wear or damage.
(1)
Figure 6-14
6-38
0000204
(1)
0001916
Rocker Arm Shaft Outside Diameter
Use a micrometer to measure the rocker arm shaft
diameter. Measure at each rocker arm location in
two directions 90° apart (Figure 6-15). See Rocker
Arm and Shaft on page 6-9 for the service limit.
Figure 6-15
Inspection of Valve Guides
Visually inspect the valve guides for distortions,
scoring or other damage.
Note: Measure the valve guides while they are
installed in the cylinder head.
Use a telescoping gauge and micrometer to
measure the inside diameter at each end of the
valve guide. Measure in three places and 90° apart
(Figure 6-16). See Intake / Exhaust Valve and
Guide on page 6-7 for the service limit. Replace
valve guides if not within specification.
Figure 6-16
TNV DI Service Manual
2-Valve Cylinder Head
0001952
0001869