The material of valve tappet stem
is
chill
Ferro - nickel ( iron)
with
the bottom sur-
face of quench hardened and phospho-
rized. The axial line of tappet stem devi-
ate the width central line of the cam
2mm,
so that the tappet stem cam rotate
surround its
own
axis to make the con-
tact surface wore evenly. The theoretical
valve timing diagram is
as
Fig.
2.
In
order
to
assure the normal running of diesel
engine,
he
adjusting of intake and ex-
haust valve clearance should be within
specified range.
4.
Piston and connecting rod assembly
TDe
inta7o~rung
_
2470
exhaust
du\a~
intake valve dos'
BDC
Fig. 2 Theoretical valve timing diagram
Except piston, piston ring and piston pin
are diferent between
RIOO
and RI05 se-
ries diesel engines, other parts of con-
necting
rod
including connecting
rod
ele-
ment,
connecting rod
bear-ing
are
all
in-
terchangeable.
Each
piston
of
diesel engine
has
two
com - pression rings and one scraper
ring. The first compression ring is distor-
9ff
ting barrel chrome - plate ring of modular
cast iron,
to
improve the abrasive resist-
ance under high temperature. The
sec- Fig. 3 The opening clearance
of
ond ring
is
taper - face ring. piston rings
in
cylinder liner
The
side of the first and second piston rings with the
word'
top'
on
it, should be
faced at top side when assembled.
The
scraper ring is a component with inner spiral
spring.
As assembling scraper ring, the opening of the inner spiral spring maintain
reed should be at
the
opposite
sid~
of
the
opening
of
scraper ring.
When
piston is
assembled,
the
arrowhead
on
it6s
top
should be at the same side with the
word
,
front'
on
connecting
rod,
i.
e.
the arrowhead
on
top
of
the piston should
be
to the
• 30 •
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