Doosan AD158TI, Operation & Maintenance Manual

Page: 97 / 294

Disassembly and assembly of major components - 91 -
<Piston ring gap>
Piston ring groove clearance.
●
Assemble the piston ring at the piston.
●
Measure the each ring
′
s groove clear-
ance and if the measured value
exceeds the limit value, replace rings
or piston.
<Piston side clearance>
(4) Piston pin
Outside diameter
With the outside micrometer, measure the
piston pin
′
s outside diameter and if the
value is same as the use limit value or less,
replace it.
Piston pin & connecting rod bush clear-
ance
Inspect the clearance between the piston
pin and the connecting rod bush, if it is
more than the use limit value, replace either
one that is more severe.
Division Standard Limit
Top ring 0.30 ~ 0.50 mm 1.5 mm
2nd ring 1.10 ~ 1.30 mm 1.5 mm
Oil ring 0.25 ~ 0.55 mm 1.5 mm
EA0M4032
Feeler gauge
Division Specified value
Limit
value
Top ring 0.105 ~ 0.150 mm 1.5 mm
2nd ring 0.050 ~ 0.082 mm 0.15 mm
Oil ring 0.030 ~ 0.062 mm 0.15 mm
EA0M4031
Standard Limit
ø45.994 ~ ø46.0 mm ø45.979 mm
EA3M2047
Limit
0.055 ~ 0.071 mm