Yanmar 4JH2E Service Manual page 36

Chapter l Basic Engine
l. Cylinder Block
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~4JH2
Senes
1·5 Cylinder bore measurement
Measure the bore diameter with a cylinder gauge at the
positions shown in the figure.
Replace the cylinder bore when the measured value ex·
ceeds the wear limit. Measurement must be done at least
at 3 positions as shown in the figure, namely, top, middle
and bottom positions in both directions along the
crankshaft rotation and crankshaft center lines.
Printed in Japan
A0AJ029-9002
Cylinder gauge
2·3
Top position
Middle position
Bottom position
Standard
~
mmf!n.)
~
~
2.
~
Direction of
crankshaft
center line
Direction of
crankshaft
rotation
mm (in)
Wear limit
Cylinder bore dia.
"82.00 ~ 82.03
"82.06 {3.2307)
{3.2283
~
3.2295)
Cylinder roundness
o~o.oi
0.02 {0.0008)
{O
~
0.0004)