3.2.4. Rocker arm shaft assembly
1) Measurement of rocker arm shaft
(1) Place the rocker arm shaft on two V-
blocks and inspect the shaft for bend
using a dial gauge.
If the amount of this run-out is small,
press the shaft with a bench press to
correct the run-out. Replace the
shaft if the measured value exceeds
the limit.
(2) With an outside micrometer, measure the rocker arm shaft diameter at the point where
the rocker arms have been installed. Replace the rocker arm if the amount of wear is
beyond the specified limit.
2) Inspection of rocker arm
(1) Visually check the face of the rocker arm in contact with the valve stem end for scores
and step wear. If the wear is small, correct it with an oil stone or grinding paper of fine
grain size. Rocker arm with a considerable amount of step wear should be replaced.
(2) Measure the inside diameter of the rocker arm bushing with an inside micrometer or
vernier calipers, and compare the measured values with the rocker arm shaft diameter. If
the clearance exceeds the limit, replace either bushing or shaft, whichever worn more.
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EDM2037I
<Figure 3-5> Measuring run-out of rocker arm
shaft
3) Inspection of tappet and push rod
(1) Measure the outer diameter of the
tappets with an outside micrometer.
If the amount of wear is beyond the
specified limit, replace tappets.
(2) Visually check the face of the tappets
in contact with the cam for pitting,
scores or cracks, and replace if
severely damaged. If the amount of
cracks or pitting is small, correct with
an oil stone or grinding paper.
(1) Pitting
(2) Crack
(3) Normal
(4) Abnormal
EFM2041I
<Figure 3-6> Inspecting tappet face
(3)
Support the push rod on two V-
blocks and check for bend using a
feeler gauge.
EDM2037I
<Figure 3-7> Measuring push rod run-out
