Yanmar 1GM User Manual page 136

130
Straig htedge
block surface. When the cylinder head is installed, the
cla mping forc e of the head agai nst the liner protrusion se-
cures the liner in place. The pro trusion also establishes a
gas-tight seal between the liner and the head gasket. In-
spect the liners as follows:
NO TE
The liner
is
a
close fi t in the block, but it
may
be
movable. Distortion or corrosion may
f reeze the liner in the block, which will ne-
cess itate a puller to remove the liner:
Cylinder liner
CHAPTE R SIX
Bo re gau ge
Prol l1Js lon
~
~F-"
i
c;::
~
~
Cylinder block
~
E::
~
~
V
1. Measure liner protrusion above the cylinder block
(F igu re SO)and compare the result with the specification
in Tab les 1-3.
a. Excess protrusion may da mage the head gasket. Ex-
cess protrusion may be caused
by
improper sea ting
of the liner flange in the block . possibly due to cor-
rosion.
b. Insufficient protrusion may allow compression
leaks and liner movement in the block. Insufficient
protrusion may be due to a worn liner or cylinder
block.
2. Measure the cylinder liner bore at several locations to
determine if the liner is out-of-round or distorted. Com-
pare measurements with the specification in Tables 1-3.
Replace the liner if the measurements exceed the specifi-
cation.
3. Inspect the liner bore. Replace the liner if it is rusty.
corroded or otherwise damaged.