Specifications
marks
on
both
the
connecting- rod
and
connecting-
rod
cap
in
order
to
avoid
making
mistakes.
The
connecting-
rod
bearing
shell is
made
of
steel with high tin
aluminium
alloy.When
the
clearance
between
the
connecting-
rod
bushes
and
crankshaft
journal
exceeds
the
specified
value
after
wearing
or
severe
stripping
and
burning
occur
on
their
surfaces,they
must
be
renewed
in
pair.
During
engine
overhaul
or
renewing
the
connecting-rod,check
the
axis parallelism
of
the
connecting-rod small
end
to
the
large
end,which
is
specified
to
be
within
O.Olmm/IOOmm(both
in vertical
and
horizontal
direction).If
it goes beyond
the
scope,alignment
should
be
made.
Before dismantling
the
piston
and
~onnecting-rod
assembly
in
cylinder
liner
or
assembling, ,
it is necessary
to
scrape
and
clean
the
carbon
deposit
and
greasy dirt
on
the
top
part
of
cylinder
Iiner.Before
assembling,smear
some
clean oil
on
the
cylinder
liner bore,external
surface
of
piston
and
piston rings,connecting- rod
bearing
shells
and
crankshaft
journal.Then
place
the
piston guide sleeve in
the
cylinder
liner.Jlt the piston and
connecting-rod
a~selnbly
into
the
cylinder
liner carefully,and tighten in
tum
the
connecting-rod
bolts
according
to
the
specified
tightening
torque
limit in several
separate
times.After
finishing
the
assembly,turn the crankshaft,
be
sure
that
it
rotates smoothly.
IV •
Crankshaft
and
Flywheel
The
crankshaft
timing
gear
and pulley are fitted
on
the
front
output
end
of
crankshaft.
Positioned
by
the
locating pin,the flywheel is fitted
on
the
rear
end
flange
of
the
crankshaft
\vith
six bolts tightened
according
to
the
specified
torque
value.A
bearing
E60203,\vhich
supports
the
transmission
shaft
of
gear
box,is fitted
on
the
flange
center
at
the
rear
end
of
the
cranks
haft.
An
angular calibrating line is marked
on
the
crankshaft
pulley
and
a pointer"which is fitted
on
the
cover
of
the
timing
gear
housing,indicates
the
reading
of
advanced
injection angle.
A flywheel
gear
ring is
bound
on
the
outside
diameter
of
flywheel in
shrinking
fit.A
calibrating
line.,\vhich provides observation for
advanced
injection angle,is
marked
on
the
flywheel.
v.
Camshaft
'fhere
is a
gear
driving
the
lube oil
pump
in the front
of
the
last
set
of
cams(facing
to
the
front end).
When
the
camshaft
revolves,the earn on
the
shaft drives the
tappets,push
rods,valve
rocker arms
and valves,which respectively control the intake
and
exhaust
valves for each
cylinder.
5-5