User Manual
ton pin, connecting rod, connecting
rod
bearing
and
connecting rod screw.
Each
piston of diesel engine
has
three compression rings
and
one scraper ring. The
first compression ring
is
barrel chrome - plate ring of modular cast iron, to improve
the abrasive resistance under high temperature.
The
second ring
is
taper - face ring
with the word
II
topll
on
the
side which should
be
upward when assembled.
The
third compression ring
is
distorting ring.
The
side with distorting groove should
be
faced downward.
The
scraper ring
is
a component with inner spiral spring.
As
as-
sembling scraper ring, the opening of the inner spiral spring maintaining reed should
be
at the opposite side of the opening of scraper ring.
As
assembling piston ring,
first it should
be
put
in
cylinder liner, then
be
checked with clearance· gauge to find
out if the opening clearance
is
in
the specified scope. If clearance
is
too small,
re-
pair with file.
The
three piston rings should
be
staggered
120°C
with each other,
and
meanwhile avoid the direction of piston
pin
hole.
See
to
Fig.
3.
IXO"
-I~~.~
----..
...
"'-.
--~
,."
Fig.
3
The
opening clearance of piston rings
in
cylinder liner
The
piston
pin
is
full floating type,
and
can
be
rotate
in
piston
pin
hole
as
it getting to
certain working temperature, to make wearing evenly. But it
is
cool, it
is
interfer-
ence fit between piston
pin
and
the piston
pin
hole.
So
when assemble
and
disas-
semble the piston pin, the piston should
be
preheated to
100
- 120°. Assemble pis-
ton
pin
by force at cool temperature
is
prohibited, otherwise the pinhole may
be
ru-
ined.
The
big
end of connecting
rod
has
a 45° inclined cut. Connecting
rod
body
and
con-
necting
rod
cap
have marking numbers at same side. When assembled, the number
must
be
registered.
The
small end of connecting
rod
has
a copper bushing.
The
oil
•
33
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