Mitsubishi diesel engines, Service Manual

Page: 26 / 219

SERVICE STANDARDS
1 - 13
Unit: mm (in.)
Gro
up
Item
Nominal
value
Standard value Limit Remarks
Free length 47 (1.85) 46 (1.81)
Squareness
θ =2.0°
Δ
=0.2
(0.0079)
Lf=47
(1.8518)
△ = 0.5
(0.0197)
across the
entire length
V
al
ve s
pri
ng
Installed length
/
load
mm (in.)/N (kgf) [lbf]
39.0 (1.536)/
131 to 145
(13.3 to 14.7)
[29 to 33]
30.1 (1.185)/
279 to 309
(28.5 to 31.5)
[63 to 69]
-15 %
Push rod Bend ― 0.3 (0.011) Replace
Cylinder head
Bottom face
distortion 0.05 (0.002)
or less
0.10 (0.004) Correct
Cylinder block top face
distortion 0.05 (0.002)
or less
0.10 (0.004) Correct
Bore
φ
78
(3.07)
78.0
+0.03
0
(3.07
+0.0012
0
)
78.2 (3.08) Bore or replace
C
yl
inde
r
Out of roundness
±
0.01 (0.0004)
or less
―
STD
78.00
(3.07)
77.93 to 77.95
(3.070 to 3.071)
77.80
(3.065)
0.25 OS
78.25
(3.08)
78.18 to 78.20
(3.080 to 3.081)
78.05
(3.075)
Diameter
0.50 OS
78.50
(3.09)
78.43 to 78.45
(3.090 to 3.090)
78.30
(3.085)
Max. allowable variation in
weight among pistons on the
same engine
±
5 g (0.177 oz)
or less
―
Piston pin diameter
φ
23
(0.9062)
22.944 to 23.000
(0.9039 to 0.9062)
―
Piston pin-to-boss clearance
0.006 to 0.018
(0.0002 to 0.0007)
0.050
(0.002)
Pi
st
on
Piston-to-cylinder clearance
0.035 to 0.086
(0.0014 to 0.0034)
0.300
(0.012)
Bore or replace
No. 1 ring
0.09 to 0.11
(0.0035 to 0.0043)
0.300
(0.012)
No. 2 ring
0.07 to 0.11
(0.0028 to 0.0043)
0.200
(0.008)
Piston
ring-to-groove
clearance
Oil ring
0.03 to 0.07
(0.0012 to 0.0028)
0.200
(0.008)
Replace piston ring
No. 1 ring
0.15 to 0.30
(0.006 to 0.012)
No. 2 ring
0.15 to 0.35
(0.006 to 0.014)
Piston ring
Piston ring gap
Oil ring
0.20 to 0.40
(0.008 to 0.016)
1.50
(0.06)
Replace
Bend and twist
0.05/100
(0.002/3.940)
0.15/100
(0.006/3.940)
Engine mai
n
p
a
rt
s
Co
nn
ecting
ro
d
End play
0.10 to 0.35
(0.004 to 0.014)
0.50
(0.020)
Replace connecting
rod
θ