Yanmar 1GM User Manual page 88

82
,..-.- A
B
o
Cylinder
block
surface
3. If the cylinder bore is damaged or excessively worn,
rebore the cylinder bore and install a new piston. If the
piston is worn, but the cylinder bore is acceptable, install a
new piston.
NOTE
Provide the machine shop with the new pis-
ton so the cylinder can be bored to the cor-
rect dimension.
CHAPTER FIVE
t
Piston Ring Fit/Installation
1. Check the ring gap of each piston ring. To do this, posi-
tion the ring at the bottom of the ring travel area and
square it by tapping gently with an inverted piston. See
Figure 37.