Hitachi EX20UR-2 Manual page 343

ENGINE/Engine
(mm)
Clearance between piston ring groove and ring
Measure clearance at several places circumferen-
tially.
(1) 3KC1
(mm)
(2) 3KR2
(kg)
(1) 3KC1
(kg)
(2) 3KR2
oz
Standard
Limit Repair method
Compression 1st 0.045-0.085
ring
2nd 0.030-0.070
0.3
Replace ring
or piston.
Oil ring
0.020-0.060 0.15
Standard Limit Repair method
1st 0.070-0.110
Compression
0.3
Replace ring
ring
2nd 0.050-0.090
or piston.
Oil ring ' 0.030-0.070 0.15
Piston ring tension
Standard Limit Repair method
Compression 1st 0.84-1.26 0.4
ring
2nd 0.62-0.98 0.3 Replace
Oil ring 2.05-3.85 0.6
Standard
Limit Repair method
Compression
1st 0.98-1.42 0.6
ring
2nd 0.84-1.26
0.6 Replace
Oil ring
2.60-4.40 1.8
CONNECTING ROD AND
CONNECTING ROD BEARING
Torsion and parallelism of connecting rod
(mm)
------------_____, Standard Limit Repair method
Torsion
(per 100 mm)
0.05 0.2 or more
Repair or replace
Parallelism
(per 100 mm)
0.05 0.15 or more
W05-02-27