12. Others/driving system
196
Crankshaft
Measurement of Crankshaft
1. Inspection and measurement
1) Visually inspect whether there is any crack or scratc
h
o
n 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 t
he
c
rankshaft 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-siz
e
bear
ing.
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 measur
e
t
he warpage of the crankshaft as spinning the crank-
shaft.
Item Standard
Crankshaft journal’s outer
diameter
Ø103.98 ~ Ø104.00mm
Crankshaft pin’s outer
diameter
Ø89.98 ~ Ø90.00mm
A
A
B
B
1
1
2
2
3
4
34
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