ENGINE
When
the
ring
is
located at
the
least worn
part (lower section)
of
the cylinder, take
out
the piston and read the gap with a
feeler gauge.
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....
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Cylinder
~~
Piston ring
Checking rings for joint gap
Connecting rods
(1)
To
check each connecting rod
for
bend and
twist,
the
connecting rod aligner must be
used.
Fit
the connecting rod
to
the
aligner
and,
if
the rod
is
found
to
be excessively
distorted,
that
is,
bent
or
twisted, repair
or replace it.
(2) Check the big end for
thrust
clearance by
fitting the big end
to
the
crankpin and
by
using a feeler gauge.
If
the clearance
is
noted excessively large, replace the con-
necting rod.
Checking connecting rod
thrust
clearance
Crankshaft
(1) A distorted crankshaft
must
be straightened
or,
if
the distortion is
too
large
to
correct,
be'
replaced. Distortion here refers
to
the
bow,
if
any,
of
the crankshaft, which can
be measured
with
a dial
indicator
in the
usual manner.
2-20
(2) Inspect
the
surfaces
of
journals and crank-
pins for burning and damage and,
as
necessary, repair these surfaces
by
grinding
to
the
next
undersize. Grinding
to
an
undersize necessitates replacement
of
the
existing bearings
by
the corresponding
undersize ones .
When grinding
the
journals and crankpins,
be sure
to
finish the
comer
radii
to
2.5
mm
(0.1 in.).
Measuring crankshaft outside diameter
(3) Check the crankshaft end play and,
if
the
measured play
is
in excess
of
the
specifica-
tion, replace
the
No.3
main bearing.
End
play measurement
is
valid only when the
crankshaft
is
set in place in
the
normal
condition, with its main bearings fitted
correctly and its bearing cap bolts tightened
to
the
prescribed
torque
value. Use a dial
gauge in
the
illustrated
manner
to
read the
end play.
Reading crankshaft end play
F
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