ENGINE
6-24
TNV IDI Service Manual
Cylinder Head
Inspection of Rocker Arm Assembly
Rocker Arm Shaft Hole Diameter
Use a telescoping gauge and micrometer to
measure the inside diameter of all the rocker arm
support brackets and the rocker arms
(Figure 6-12)
Rocker Arm and Shaft on page 6-6 for the service
limit.
Inspect contact areas
(Figure 6-12, (1))
for
excessive wear or damage.
Figure 6-12
Rocker Arm Shaft Outside Diameter
Use a micrometer to measure rocker arm shaft
diameter. Measure at each rocker arm location in
two directions 90° apart
(Figure 6-13)
. Record the
measurements.
page 6-6 for the service limit.
Figure 6-13
Inspection of Valve Guides
Visually inspect the valve guides for distortions,
scoring or other damage.
Note: Measure valve guides while they are
installed in cylinder head.
Use a telescoping gauge and micrometer to
measure the inside diameter of the valve guide.
Measure in three places and 90° apart
(Figure 6-14)
. Record the measurements.
Intake / Exhaust Valve and Guide on page 6-5 for
the service limit.
Replace valve guides if not within
specification.
Figure 6-14
Inspection of Cylinder Head
Cylinder Head Distortion
Put the cylinder head flat and inverted (combustion
side up) on the bench. Use a straightedge and
feeler gauge to measure cylinder head distortion
(Figure 6-15)
. Measure diagonally and along each
side. Record the measurements.
Head on page 6-4 for the service limit.
Figure 6-15
0001916
(1)
(1)
0001
9
52
0001
8
69
00001
9
2
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