Width Of Crankpin And Rearmost Crank Main Journal - Measure - Mitsubishi S6R Series Service Manual

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 inspection.
Ensure that the finishing surface roughness after grinding 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.
Item
Crankpin width
Rearmost crank journal width
6-28
Nominal value
67 mm [2.64 in.]
Standard
66 mm [2.60 in.]
Over size
Crankpin width
Width of Crankpin and Rearmost Crank Main Journal -
3.2S
0.8S
Fillet radius
R8.5
Rearmost Crank Main Journal Width - Grind
Size
- 67.20 to 67.30 mm [2.6457 to 2.6496 in.]
66.00 to 66.05 mm [2.598 to 2.600 in.]
0.25 mm [0.0098 in.] 66.25 to 66.30 mm [2.6083 to 2.6102 in.]
0.50 mm [0.0197 in.] 66.50 to 66.55 mm [2.6181 to 2.6201 in.]
0.75 mm [0.0295 in.] 66.75 to 66.80 mm [2.6279 to 2.6299 in.]
1.00 mm [0.0394 in.] 67.00 to 67.05 mm [2.6378 to 2.6398 in.]
1.25 mm [0.0492 in.] 67.25 to 67.30 mm [2.6476 to 2.6496 in.]
1.50 mm [0.0591 in.] 67.50 to 67.55 mm [2.6575 to 2.6594 in.]
Rearmost crank journal width
Measure
3.2S
Fillet radius
R8.5
Standard value