Doosan AD158TI, Operation & Maintenance Manual

Page: 182 / 294

Appendix - 176 -
Item
Compo-
nent
Inspection item Specifications
Allow-
able
Limit
Repair Remarks
Main
drive
compon
ents
Piston
ring
Piston pin O.D.
ø
41.994 ~
ø
42
Replace the
piston pin
Clearance between the
piston and bushing
0.055 ~ 0.071
Replace if the
wear exceeds
the specified
amount
Crank
shaft
Unevenly worn journal
and pin
0.01
Repair it with a
grinder
Measure in vertical
and horizontal
directions
Journal O.D.
ø
83.966 ~
ø
83.988
ø
83
Use the
undersize
bearing
Pin O.D.
ø
70.971 ~
ø
70.990
ø70
Each (0.25, 0.5,
0.75, 1.0)
Ovalness of journal and
pin
0.008 0.025
Allowable concentricity
of journal and pin
0.01 0.03
Allowable inclination of
journal and pin
0.01 0.03
Crankshaft and bearing
clearance
0.052 ~ 0.122 0.25
Replace the
valve spring
Measure on crown
Crankshaft free play 0.15 ~ 0.325 0.25
Replace the
thrust bearing
Deflection of crankshaft 0.1
↓
Adjust
deflection with a
press Measure at No. 4
(Supporting No. 1
and 7)
Crankshaft balance
(g.cm)
60
↓
60 or
less
Tightening torque of
journal bearing
cap bolt (kg.m)
30
Apply oil to the
bolt
There should be
no foreign material
on the bearing cap
mounting surface
Journal bearing crush 0.08 ~ 0.110
Tighten the metal
cap and unscrew
one stud bolt for
measurement
Worn oil seal (Back side
of crankshaft)
Replace the oil
seal if there are
any oil leaks