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Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
5.6 Width of Crankpin and Rearmost Crank Main Journal - Measure
(1) Inspect the ends of crankshaft for harmful flaw and
wear.
(2) Measure the crankpin and rearmost crank main journal
width.
When using oversize thrust plate due to wear of rear-
most crank journal width, grind the crankshaft for use
with oversize thrust plate.
5.6.1 Rearmost Crank Main Journal Width - Grind
When using the oversize thrust plate, grind the rearmost
crank journal width for use with oversize thrust plate.
Do not change the fillet radius when grinding.Quench the
crankshaft if its surface hardness is significantly decreased,
and after quenching do the magnetic particle inspec-
tion.Ensure that the finishing surface roughness after grind-
ing is in the standard value.
Note: The difference of thickness between front and rear
thrust plates must be 0.25 mm [0.0098 in.] or less.
Width of Crankpin and Rearmost Crank Main Journal -
Measure
Rearmost Crank Main Journal Width - Grind
Rearmost crank
journal width
Crankpin width
ٖٖٖٖ
ٖٖٖ
3.2S
ٖٖٖ
3.2S
Fillet radius
R7
Fillet radius
R7
Item
Nominal
value
Size Standard value
Crankpin width
108 mm
[4.25 in.]
-
108.20 to 108.30 mm [4.2597 to 4.2637 in.]
Rearmost crank jour-
nal width
58 mm
[2.28 in.]
Standard 58.00 to 58.03 mm [2.2834 to 2.2846 in.]
Over
Size
0.25 mm [0.0098 in.] 58.25 to 58.28 mm [2.2932 to 2.2944 in.]
0.50 mm [0.0197 in.] 58.50 to 58.53 mm [2.3031 to 2.3043 in.]
0.75 mm [0.0295 in.] 58.75 to 58.78 mm [2.3129 to 2.3141 in.]
1.00 mm [0.0394 in.] 59.00 to 59.03 mm [2.3228 to 2.3240 in.]
1.25 mm [0.0492 in.] 59.25 to 59.28 mm [2.3327 to 2.3339 in.]
1.50 mm [0.0591 in.] 59.50 to 59.53 mm [2.3425 to 2.3437 in.]
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