Rocker arm bushing diameter
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.
(3) Tappet and push rod
Clearance
Measure the clearance of the tappet and tappet holes
of the cylinder block. If the value is beyond the
specified limit, replace tappets.
Visual check of tappet
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.
Outside diameter of tappet
With an outside micrometer, measure the tappet
outside diameter If the measured value is beyond the
limit, replace tappets.
SPC000006 5ton Diesel Engine
Page 52
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