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Crankshaft undersize dimensions (Unit: mm)
Finished journal outside diameter
Finished pin outside diameter
Out-of-roundness
Taper
Grinding of crankshaft
CAUTION
• If the crankshaft pins and journals are ground to
undersizes, be sure to use bearings of corresponding
undersizes.
• Do not change the center-to-center distance A between the jour-
nal and pin.
+0.0252
A: 57.5
–0.075
• Do not change the journal width B and the pin width C.
+0.2
B: 37
mm
0
+0.2
C: 42
mm
0
• Finish the fillets D smoothly.
D: R4 ± 0.2 mm
• Carry out a magnetic inspection to check for cracks possibly
caused by grinding. Also, check that the hardness of the surface
has not dropped below Shore hardness number (Hs) 75.
• Replace the crankshaft if defects are evident.
0.25
83.685 to 83.705
83.435 to 83.455
69.67 to 69.69
69.42 to 69.44
• When grinding, turn both the crankshaft and the grinder counter-
clockwise as viewed from the crankshaft front end.
• When finishing the crankshaft with whetstone or sandpaper, ro-
tate the crankshaft clockwise.
Inspection: Distortion of crankcase top surface
• If the measurement exceeds the limit, correct the crankcase top
surface with a surface grinder.
CAUTION
• Do not grind the crankcase top surface so much as to com-
promise the correct piston projection.
mm
Undersizes
0.50
0.75
83.185 to 83.205
69.17 to 69.19
0.01 or less
0.006 or less
11
1.00
82.935 to 82.955
68.92 to 68.94
11-73
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Troubleshooting
