F.
Cylinder
1.
Visually check the cylinder walls for
scratches.
If vertical scratches
are
evi-
dent, the
cylinder wall should be rebored
or the
cylinder should
be
replaced.
2.
Measure cylinder wall wear
in
the man-
ner
as
shown. If wear is excessive, com-
pression pressure will decrease, and
engine
trouble will occur. Rebore the
cylinder wall, and replace the piston and
piston rings.
Cylinder wear should
be
measured at
three depths by
placing the measuring
instrument
parallel
to
and at right angles
to the crankshaft. (See the illustration.)
If the cylinder wall is worn beyond the
wear'limit, it should
be
rebored.
3-19
0,
and
0,
0 3
and
O.
O,
and
O.
---------
Standard
Cylinder
bore
92mm
(3.622 in)
Cylinder taper
-
G. Piston and Piston Rings
Piston
Wear limit
92.1
mm
(3.626 in)
0.OO5mm
(0.0002
in)
1.
Using the micrometer, measure the out-
side diameter
of
the piston at the piston
skirt. Measurement
should
be
made at a
point 9.5
mm
(0.37 in) above the bottom
edge
of
the piston by placing the
micrometer
parallel to
and
at right
angles
to
the piston pin.
Piston clearance:
0.045 - 0.065 mm
(0.0018 - 0.0026 in)
1. 6.
0mm
(0,236 in)
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