2.
Cylin~er
block and related assembly
The cylinder
blockofR
series diesel engine
is
short skirt construction without side
0-
pening. The main oil
distrib~ting
passage
is
at the left side of cylinder block ( view
from flywheel end) ,the fuel injection pump,oil filter,fuel filter and oil cooler are at
this side
as
well. The push - rod chamber are located at the right side
of
cylinder
block, crankshaft case ventilator, generator, starting
motor,
air compressor and hy-
draulic pump
as
well.
A laser quenched
wet
cylinder liner is fitted
in
the upper part
of
cylinder block.
In
or
der to press it tight enough,its upper end
is
0.05
-0.
12mm,higher than that of
cyl-
inder block.
The main bearing at the lower part
of
cylinder block
is
a full supporting type. The
main bearing cover is positioned horizontally by shoulders at sindes
of
cylinder block,
and is machined together
with
cylinder block, thus
can
not be changed each other.
For
this reason, each main bearing cover
has
its sequential number and a triangle
symbol,the arrow
of
triangle
is
to
the front.
Each
upper
mainbeatihg
half
has
oil
holes
on
it. The bearings are
all
made of steel back aluminum alloy. The''clearance
between main bearing and crankshaft journal is not adjustable. Whenever the clear-
ance is over limited value after bearing
worn,
it must
be
to change the bearings.
When tight the main bearing
bolts, each
two
bolts at one same
bearing.
should be
tightened gradually and
al~ernately
into specified torque. As there
is
anti
....
loose
quenched gasket,the main bearing bolts bave no locked gasket.
3. Camshaft assembly
The
camshaft of R series diesel engine
is
full supporting,the
cam
is
function cam,
to
adapt different working speed. Camshaft
is
driven by crankshaft timing gear through
idling gear and camshaft timing gar. There are engage marks on the timing gear,the
marks should be aligned when assembly. There assembled
a camshaft thrust plate
between camshaft timing gear
and
shaft collar,
to
control the axial clearance
of
cam-
shaft.
• 29 •
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