Specifications
Check
the
ring
end
gap
before
assembling
the
piston ring.The
method
measuring
this
gap
is
recommended
as
follows:Press
down
the
piston ring
evenly
into the
cylinder
liner by 15--
20mm
from
the
top
surface
of
liner.
Measure
the
clearance
with
a feeler
3
2
Fig. 7 Measurement
of
piston riog end gap
1. Thickness feeler(gauge)
2.
Piston
ring 3
..
Cylinder liner
case
the
gap
value
is less ,enlarge it
by
a
file.If
it is excess,replace
it
with
another
one.In addition.,measurement
should
be
Inade with a feeler(gauge)to
check
the
side
gauge.In normal case,the
measuring
value
should
be O.2--0.4mm(Fig.7).In
clearance
between
the
piston ring
and
ring
groove.The
side clearance
for
the
first ring
should
be
O.07r~O.1
02mm
and
o.
05---0.082mm
for
the
second
ring
as
shown
in
Fig8.
When
disnlantling
and
asselnbling
the
piston
ring,a special tool may be used.
'fhe
ring
end
gap
of
piston rings
should
be
set
off
with each
other
by
120°C
to
prevent being in line
with
the
piston pin
seat hole.
Fig. 8 Measurement
of
side surface
gap
of
piston ring
If
the
piston ring is seized and
could
not
move
when
checking,soak
it in diesel fuel(kerosine
or
gasoline)for
24h
or
more.l'hen
knock
the
piston
ring
slightly
to
tnake it
become
flexible
of
itselt~On
getting
out
the
piston ring,clean
it
in
diesel fuel
or
carbon
tetrachloride.
Check
the
piston to see
whether
there is
any
cracks
or
scars_Change
the
defective
piston
and
renew
its rings.
The
cross section
of
the connecting- rod is
1-
shaped,with
the
splitting
surface
of
large
end
being
perpendicular
to
the
center
line
of
connecting- rOd.Boring the
connecting-
rod hole and
connecting-rod
cap
must
be
Inated.l~herefore
when
assembling,pay
close
attention to
the
mating
5-4