Mitsubishi S12A2 User Manual

2-6
Chapter 2 SERVICE DATA
Connecting
rod
Inside diameter of connecting rod bushing ø58 [2.28]
58.020 to 58.040
[2.2842 to 2.2850]
58.070
[2.2862]
Bend and twist
0.05/100 [0.0020/3.94]
or less
End play
0.6 to 0.9
[0.024 to 0.035]
1.0 [0.039]
Inside diameter of big end bore ø110 [4.33]
110.000 to 110.022
[4.3307 to 4.3316]
Minimum:
109.950
[4.3287]
Maximum:
110.050
[4.3327]
Roundness for inside diameter of big end bore 0.100 [0.0039]
Big end side (width)
53.7 to 53.8
[2.114 to 2.118]
Connecting
rod
bearing
Thickness at
center
Standard
3.000
[0.1181]
2.987 to 3.000
[0.1176 to 0.1181]
2.950 [0.1161]
Under size
0.25 [0.0098]
3.125
[0.1230]
3.112 to 3.125
[0.1225 to 0.1230]
3.075 [0.1211]
0.50 [0.0197]
3.250
[0.1280]
3.237 to 3.250
[0.1274 to 0.1280]
3.200 [0.1260]
0.75 [0.0295]
3.375
[0.1329]
3.362 to 3.375
[0.1324 to 0.1329]
3.325 [0.1309]
1.00 [0.0394]
3.500
[0.1378]
3.487 to 3.500
[0.1373 to 0.1378]
3.450 [0.1358]
Flywheel
Face runout (reference) 0.285 [0.0112] or less
Radial runout (reference) 0.127 [0.0050] or less
Damper
Face runout (reference) 0.5 [0.0197] or less
Radial runout (reference) 0.5 [0.0197] or less
Rear mecha-
nism
Backlash between crank gear and idler gear
0.11 to 0.25
[0.0043 to 0.0098]
0.50 [0.0197]
Backlash between fuel injection pump gear and
camshaft gear
0.12 to 0.18
[0.0047 to 0.0071]
0.50 [0.0197]
Backlash between idler gear and fuel injection
pump gear
0.12 to 0.18
[0.0047 to 0.0071]
0.50 [0.0197]
Backlash between oil pump gear and crankshaft
gear
0.12 to 0.18
[0.0047 to 0.0071]
0.50 [0.0197]
Idler bushing inside diameter ø50 [1.97]
50.000 to 50.025
[1.9685 to 1.9695]
50.060
[1.9709]
Idler shaft outside diameter ø50 [1.97]
49.950 to 49.975
[1.9665 to 1.9675]
49.900
[1.9646]
Idler gear end play
0.2 to 0.4
[0.0079 to 0.0157]
0.6 [0.0236]
Cam
shaft
Cam lift
(major axis - minor axis)
7.71 to 7.76
[0.3035 to 0.3055]
6.79 [0.2673]
Runout 0.05 [0.0020] or less 0.08 [0.0031] TIR
Journal diameter
No. 1 journal ø64 [2.5]
63.920 to 63.940
[2.5165 to 2.5173]
63.870
[2.5146]
No. 2-7 journal ø68 [2.6]
67.920 to 67.940
[2.6740 to 2.6748]
67.870
[2.6720]
Camshaft bushing inside
diameter
(as installed in crankcase)
No. 1 journal ø64 [2.5]
64.000 to 64.030
[2.5197 to 2.5209]
64.090
[2.5232]
No. 2-7 journal ø68 [2.6]
68.000 to 68.030
[2.6772 to 2.6783]
68.090
[2.6807]
End play
0.20 to 0.30
[0.0079 to 0.0118]
0.40 [0.0157]
Unit: mm [in.]
Item
Nominal
value
Standard value Limit value Remarks

Mitsubishi S12A2 Specifications

General

Brand	Mitsubishi
Model	S12A2
Category	Engine
Language	English