Yanmar 4LHA-HTP Operation Manual page 331

Chapter 2 Basic Engine
2. Cylinder Block
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.
Cylinder gauge
Cylinder bore dia.
Cylinder roundness
2-11
o
I
S
eo
V|01O9.OOO~ 109.087
d
(04.29134 - 4.29476)
8
m
Top position
Middle position
Bottom position
Direction of
crankshaft
center line
Direction of
crankshaft
rotation
Standard
0103.00-103.03
(04.0551 -4.0563) 0103.06(04.0575)
0 - 0 . 0 1
(0 - 0.0004)
,4LHA Serie
mm (in)
mm (in.)
Wear limit
0.02(0.0008)