Mitsubishi S12A2 User Manual

2-7
Chapter 2 SERVICE DATA
Crankshaft
Crankpin
outside
diameter
Standard
ø104 [4.1]
103.900 to 103.920
[4.0905 to 4.0913]
103.860
[4.0890]
Under size
0.25 [0.0098]
103.650 to 103.670
[4.0807 to 4.0815]
103.610
[4.0791]
0.50 [0.0197]
103.400 to 103.420
[4.0709 to 4.0716]
103.360
[4.0693]
0.75 [0.0295]
103.150 to 103.170
[4.0610 to 4.0618]
103.110
[4.0594]
1.00 [0.0394]
102.900 to 102.920
[4.0512 to 4.0520]
102.860
[4.0496]
Crankshaft
main journal
outside
diameter
Standard
ø130 [5.1]
129.880 to 129.900
[5.1134 to 5.1142]
129.840
[5.1118]
Under size
0.25 [0.0098]
129.630 to 129.650
[5.1035 to 5.1043]
129.590
[5.1020]
0.50 [0.0197]
129.380 to 129.400
[5.0937 to 5.0945]
129.340
[5.0921]
0.75 [0.0295]
129.130 to 129.150
[5.0838 to 5.0846]
129.090
[5.0823]
1.00 [0.0394]
128.880 to 128.900
[5.0740 to 5.0748]
128.840
[5.0724]
Parallelism of journal and crankpin
Deviation of 0.01
[0.0004] or less over
entire pin length
0.03
[0.0012]
Circularity of journal and crankpin
Diameter difference
0.01 [0.0004] or less
0.03
[0.0012]
Cylindricity of journal and crankpin
Diameter difference
0.01 [0.0004] or less
0.03
[0.0012]
Fillet radius of pin R7 [0.28]
6.8 to 7.0
[0.2677 to 0.2756]
Fillet radius of journals R7 [0.28]
6.8 to 7.0
[0.2677 to 0.2756]
Hardness of journals and crankpins Hv > 620
Finishing surface roughness Ra 0.2 μm [0.008 µin.]
Angular deviation between pins ±0.3°
Crankpin width
108
[4.2520]
108.20 to 108.30
[4.2598 to 4.2638]
Crankshaft
Rearmost
crank jour-
nal width
Standard
58 [2.2835]
58.00 to 58.03
[2.2835 to 2.2846]
Over size
0.25 [0.0098]
58.25 to 58.28
[2.2933 to 2.2945]
0.50 [0.0197]
58.50 to 58.53
[2.3031 to 2.3043]
0.75 [0.0295]
58.75 to 58.78
[2.3130 to 2.3142]
1.00 [0.0394]
59.00 to 59.03
[2.3228 to 2.3240]
1.25 [0.0492]
59.25 to 59.28
[2.3327 to 2.3339]
1.50 [0.0591]
59.50 to 59.53
[2.3425 to 2.3437]
Runout 0.04 [0.0016] or less 0.10 [0.0039] TIR
End play
(width between webs and thrust bearings)
0.200 to 0.395
[0.0079 to 0.0156]
0.500 [0.0197]
Unit: mm [in.]
Item
Nominal
value
Standard value Limit value Remarks

Mitsubishi S12A2 Specifications

General

Brand	Mitsubishi
Model	S12A2
Category	Engine
Language	English