-５３-
9.
Maintenance Standards/ Tightening Torques
9-1 Standards and Service Ability Limit
Maintenance Item
Unit
EBZ7500
EBZ8500
※
1
Measuring
Procedure
Standard
Limit
Standard
Limit
Cylinder
Compression pressure
kgf/cm²
（
kPa
）
8.4
5.6
8.4
5.6
CPG
Cylinder/ Piston
ring
Replace.
Bore
mm
φ
47.5
※
2
φ
51
※
2
CG
Expose of base
metal: Replace.
Piston
Piston skirt diameter
mm
φ
47.454
～φ
47.474
φ
47.37
φ
50.98
～
φ
50.91
φ
50.81
MM
Replace.
Piston ring
groove width
Top
mm
1.23
1.3
←
←
TG
Replace.
2nd
1.21
1.3
←
←
Piston pin hole
mm
φ
12.005
φ
12.045
←
←
CG
Replace.
Clearance between
piston and cylinder
mm
0.056
～
0.096
0.22
0.07
～
0.11
0.22
MM
CG
Piston
Replace.
Clearance
between piston
groove and
piston ring
Top
mm
0.06
～
0.1
0.15
←
←
TG
Replace.
2nd
0.04
～
0.08
0.15
←
←
Fitting between piston
pin and piston pin hole
mm
0.005
～
0.021
0.05
←
←
MM
CG
Replace.
Piston Ring
End gap at cylinder skirt
mm
0.15
～
0.35
0.6
←
←
TG
Replace.
Width
mm
1.2
1.1
←
←
MM
Replace.
Piston Pin Diameter
mm
φ
12
φ
11.98
←
←
MM
Replace.
Connecting
Rod
Small end bore
mm
φ
16
φ
16.03
←
←
CG
Replace.
Parallelism of large/ small
end bores
0
0.15/
100
※
3
←
←
Mandrel
DG
Replace.
Crankshaft
Diameter at
main bearing
MAG
mm
φ
16
φ
15.95
←
←
MM
Replace.
PTO
φ
16
φ
15.95
←
←
Diameter at oil seal
(MAG
，
PTO)
mm
φ
16
φ
15.9
←
←
MM
Replace.
Eccentricity
mm
0
0.06
※
4
（
@ 6
）
←
←
DG
Center
Support
Repair or replace.
Width between crank
webs
mm
31
30.9
～
31.1
←
←
MM
Repair or replace.
Axial Play
mm
0.071
～
0.369
0.5
0.057
～
0.383
0.5
TG
Replace.
Main Bearing
－
－
※
5
－
※
5
－
Replace.
※
1
Meaning of abbreviations
CG
：
Cylinder Gauge/
MM
：
Micrometer/
DG
：
Dial Gauge/
TG
：
Thickness Gauge/
CPG
：
Compression
gauge
※
2
Peel off of plating or expose of base metal.
※
3
length of the 100m, 0.05 or less
※
4
Points from the crank web of 6mm
※
5
Flutter, irregular noise generated
Содержание EBZ7500
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