Yanmar 3TNV82A-B, Service Manual, Page: 188 / 394

ENGINE
6-56
TNV DI Service Manual
4-Valve Cylinder Head
Thoroughly clean all components using a non-
metallic brush and an appropriate solvent. Each
part must be free of carbon, metal filings and other
debris.
Inspection of Cylinder Head
Components
Visually inspect the parts. Replace any parts that
are obviously discolored, heavily pitted or otherwise
damaged. Discard any parts that do not meet its
specified limit.
Inspection of Push Rods
Push Rod Bend
1. Place the push rods on a flat inspection block or
layout bed.
2. Roll the push rods until a gap can be observed
between a portion of the push rod and the
surface of the block or layout bed.
3. Use a feeler gauge to measure the gap
(Figure 6-51). See Push Rod on page 6-9 for
the service limit.
Figure 6-51
Inspection of Rocker Arm Assembly
Rocker Arm Shaft Hole Diameter
1. Use a telescoping gauge and micrometer to
determine if the inside diameter of all the rocker
arm support brackets and the rocker arms
(Figure 6-52) are within the specified limits.
See Rocker Arm and Shaft on page 6-9 for the
service limit.
2. Inspect the contact areas (Figure 6-52, (1)) for
excessive wear or damage.
CAUTION
Any part which is found defective as a
result of inspection or any part whose
measured value does not satisfy the
standard or limit must be replaced.
0000119en
CAUTION
Any part determined to not meet the
service standard or limit before the next
service, as determined from the state of
current rate of wear, should be replaced
even though the part currently meets the
service standard limit.
0000120en
0000204
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