Doosan AD158TI, Operation & Maintenance Manual

Page: 96 / 294

Disassembly and assembly of major components - 90 -
●
With the outside micrometer, measure
the piston
′
s outside diameter the mea-
suring position is 71.5 mm from the pis-
ton lower end, and the direction of
measurement must be perpendicular to
the piston pin direction.
●
By comparing the measured value of the
piston outside diameter with the cylinder
liner inside diameter, the bigger clear-
ance is replaced.
●
Measurement of cylinder bore
Assemble the cylinder liner at the cylin-
der block and measure inner diameter at
upper, middle, lower that is, 3 steps by
45
°
interval and calculate the average
values after eliminating the maximum
and minimum values.
●
Measure the clearance between the cyl-
inder liner bore and the piston outer
diameter, if it is more than the use limit
value, replace either one that is more
severe.
(3) Piston ring & ring groove
Inspection
In case of piston ring
′
s wear, damage or engine overhaul, replace piston rings.
Gap clearance
Measure the piston ring cut part.
●
Insert the piston ring at the cylinder
liner
′ s upper part perpendicularly.
●
With a feeler gauge, measure the gap
clearance of piston ring.
●
If the measured value exceeds the
limit value, replace it.
71.5 mm
EA3M2045
Standard
ø127.739 ~ ø127.757 mm
2
EAMD067I
Standard ø127.990 ~ ø128.010 mm
Standard
0.233 ~ 0.271 mm
EA0M4033
Filler gauge