12. Others/driving system
196
Crankshaft
Measurement of Crankshaft
1. Inspection and measurement
1) Visually inspect whether there is any crack or scratch
on the journal and pins of the crankshaft.
2) Perform the magnetic particle testing or the liquid
penetrant testing (color check) to check the cracks on
the crankshaft. If cracks are found, replace the crank-
shaft with a new one.
2. Measuring journal and pin diameter
1) Using an outer diameter micrometer, measure the
crankshaft journals and pins toward the direction as
shown in the figure to determine the amount of wear.
DV2213147A
DV2213148A
2) If the amount of wear exceeds the tolerance limit,
grind the crankshaft and assemble an under-size
bearing.
3) There are 4 kinds as below, and the crankshaft also
can be used by regrinding as below.
•
Standard
•
0.25 (Inside diameter 0.25 mm less than standard)
•
0.50 (Inside diameter 0.50 mm less than standard)
•
0.75 (Inside diameter 0.75 mm less than standard)
•
1.00 (Inside diameter 1.00 mm less than standard)
4) “R” part standard value
•
Crank pin "R": 3.5 ~ 4.0
•
Crank journal "R": 3.5 ~ 4.0
DV2213149A_E
3. Warpage of crankshaft
1) Put the crankshaft on the V block.
2) Put the dial gauge on the surface plate and measure
the warpage of the crankshaft as spinning the crank-
shaft.
Item
Standard
Crankshaft journal’s outer
diameter
Ø
103.98 ~
Ø
104.00mm
Crankshaft pin’s outer
diameter
Ø
89.98 ~
Ø
90.00mm
A
A
B
B
1
1
2
2
3 4
3 4
CAUTION
In case of crankshaft regrinding, the “R” part at the
end of bearing must accurately be ground without
fail and should avoid any processed jaw or coarse
surface.
Normal
Abnormal
Normal
