Yanmar 4LHA-DTP - Page 331

Chapter 2 Basic Engine
2. Cylinder Block
,4LHA Serie
2-5 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 in at
least 3 positions as shown in the figure, namely, the
top, middle and bottom positions in both directions
along the crankshaft rotation and crankshaft center
lines.
o
I
Cylinder gauge
V|01O9.OOO~ 109.087
(04.29134 - 4.29476)
S mm (in)
eo
d
8
Top position
m
Middle position
Bottom position
Direction of
crankshaft
center line
Direction of
crankshaft
rotation
mm (in.)
Standard
Wear limit
Cylinder bore dia.
0103.00-103.03
(04.0551 -4.0563)
0103.06(04.0575)
Cylinder roundness
0-0.01
(0 - 0.0004)
0.02(0.0008)
2-11