3.2.3 Rocker arm assembly
1) Disassembly
(1) Disassemble the snap rings that are located at both
ends of rocker arm shaft by a plier.
(2) Disassemble in the order of washer, rocker arm
bracket, rocker arm spring, rocker arm.
2) Inspection of rocker arm assembly
(1) Rocker arm shaft
Rocker arm shaft run-out
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.
Rocker arm shaft diameter
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) Rocker arm
Visual check
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.
5ton Diesel Engine SPC000006
Page 51
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