Mitsubishi diesel engines Service Manual page 26

Item
Free length
Squareness
Installed length / load
mm (in.)/N (kgf) [lbf]
Push rod Bend
Bottom face
Cylinder head
distortion
Cylinder block top face
distortion
Bore
Out of roundness
STD
Diameter
0.25 OS
0.50 OS
Max. allowable variation in
weight among pistons on the
same engine
Piston pin diameter
Piston pin-to-boss clearance
Piston-to-cylinder clearance
No. 1 ring
Piston
ring-to-groove No. 2 ring
clearance
Oil ring
No. 1 ring
Piston ring gap
No. 2 ring
Oil ring
Bend and twist
End play
Nominal
Standard value
value
47 (1.85)
ƒ Æ =2.0°
ƒ ¢ =0.2
(0.0079)
Lf=47
(1.8518)
39.0 (1.536)/ 30.1 (1.185)/
131 to 145 279 to 309
(13.3 to 14.7) (28.5 to 31.5)
[29 to 33] [63 to 69]
• \
0.05 (0.002)
or less
0.05 (0.002)
or less
ƒ Ó 78
+0.03
78.0 (3.07
0
(3.07)
• } 0.01 (0.0004)
or less
78.00 77.93 to 77.95
(3.07) (3.070 to 3.071)
78.25 78.18 to 78.20
(3.08) (3.080 to 3.081)
78.50 78.43 to 78.45
(3.09) (3.090 to 3.090)
• } 5 g (0.177 oz)
or less
22.944 to 23.000
ƒ Ó 23
(0.9039 to 0.9062)
(0.9062)
0.006 to 0.018
(0.0002 to 0.0007)
0.035 to 0.086
(0.0014 to 0.0034)
0.09 to 0.11
(0.0035 to 0.0043)
0.07 to 0.11
(0.0028 to 0.0043)
0.03 to 0.07
(0.0012 to 0.0028)
0.15 to 0.30
(0.006 to 0.012)
0.15 to 0.35
(0.006 to 0.014)
0.20 to 0.40
(0.008 to 0.016)
0.05/100
(0.002/3.940)
0.10 to 0.35
(0.004 to 0.014)
SERVICE STANDARDS
Limit
46 (1.81)
• ¢ = 0.5
(0.0197)
across the
entire length
-15 %
0.3 (0.011)
0.10 (0.004)
0.10 (0.004)
+0.0012
78.2 (3.08)
)
0
• \
77.80
(3.065)
78.05
(3.075)
78.30
(3.085)
• \
• \
0.050
(0.002)
0.300
(0.012)
0.300
(0.012)
0.200
(0.008)
0.200
(0.008)
1.50
(0.06)
0.15/100
(0.006/3.940)
0.50
(0.020)
Unit: mm (in.)
Remarks
Replace
Correct
Correct
Bore or replace
Bore or replace
Replace piston ring
Replace
Replace connecting
rod
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