Doosan DE12T - Clearance; Diameter of the Rocker Arm Bushing; Rocker Arm; Tappet and Push Rod

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 grind-
ing paper of fine grain size. Rocker arm
with a considerable amount of step wear
should be replaced.
•
Diameter of the rocker arm bushing
Measure the inside diameter of the rock-
er arm bushing with an inside microme-
ter 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.
<Clearance>
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.
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EA0M4059
Standard Limit
0.020 ~ 0.093 mm 0.25 mm
Standard Limit
0.035 ~ 0.077 mm 0.1 mm