Yanmar 3JH3E Service Manual page 34

Chapter 2 Basic Engine
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3,4JH3(B)(C)E
(2) Bending of the crankshaft
Support the crankshaft with V •blocks at both ends of
the journals, Measure the deflection
of
the center jour-
nal with a dial gauge while rotating the crankshaft to
check the extent of crankshaft bending.
Dtal
gauge
Bend
Deflection
mm
Crankshaft bend Less
than
0.02 mm
(3) Measuring the crank pin and journal
Measure
the
extent of journal wear (roundness, taper).
Regrind it to the proper shape if it is within the outer
diameter limit, and replace if not.
I
Crank pin
Outside dia,
Crank pin and bearing oil clearance
Outside dia,
Crank journal
Crank journal and bearing
oil
clearance
Fillet rounding of crank pin and journal
Printed
in
Japan
HINSHI-H!\009
2-19
Crank pin
mm
Standard Wear
limit
f 47.952~67.962
47.91
0.038~0.068 0.25
49.952~-49.962
49.75
0.036~0.068
0,15
3.5D0~3.8D0
~-