CONSTRUCTI
ON
AND F
UNCTION
Piston
rings
Each
pi,ton
i,
fitted with three rings; two compr.ssion
ring' (Nos. 1
and
2
as
counted from top) and
on.
oil
n
ng.
No.
1 ring and
oil
ring have their faces chrome·
plaled .
No.
2 ring
Is
tapered.
An
expander co
il
is
pT
01;
i
ded
msi
d
e.
the
oil
ring
to
a
ugment
its
elaslic
sirength,
..
.
...
..
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CD
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2
' ·ComPrnsrDII rings
2·0;f
ring
Pisto
n
ri
ngs
Piston pins
The piston pin
is
hollow. Its sliding surface is c"",·
hardened
by
carbumation.
It
is fitted to the piston and
c
arri
es t
he
smaU
en
d of the connecti
ng
rod
in
"f
ull
noatin
g"
manner.
Th
e pin
insert
ed
in
to the piston i,
relained
in pl
"e
by a
sn.p
ring fitted into the pin hole
at
eac
h end,
Co
nnectlni rods
The connecting fad
is
a die
fo
r
gin
g,
sh
a
pe
d to p
re
se
nt
an
uro
cross
section
in
i
ts
sh
a
nk
in
or
der
to m
inim
iz
e
it
s
Own
mass
an
d yet to retain large st
ren
gth nece
ss
ary for
withst
andi
ng
th
e
hig
h. comp
ressi
ve
forc
e exe
rted
by
the
p
is
I
on
and
also the comp
lt
x bending
sbess
.
It
s min
i-
mized
mas
s
redu
c
es
the
st
res
se
s
due
to
it
s own mertia.
A
lead
bronze bushing
is
pr
ess
-fitted, into i
ts
small end.
A
ke
l
met
bearing
is
use
d
in
th
e
big
end
to cope with
the
high
bearing load
to
whi
ch
the big end is subjected.
Timing gear train
'
~"1:I1t
g!'ar
2·ldler
3.C
...,
nksh
,h
g9sr
4.l
nJee
~jon
pump
gear
5-ldter
shah
6
--Co
ve
r
7
·Ti
ming gellr
ca
~o
Ti
ming
gear
train
Timing
gear
ease
o
the
fr
ont
end
face
of c
rankcase
is
attach
ed a
lar
ge
mo
unting plate called
the
front plate _
To
this plate
i,
bolt
ed
the
linning
geat
case
,
in
which the timing gears are
housed.
The
fron
t plate
is
doweled
to
the
crankC3se
by two
pi
ns
.
20
The fuel
in
jecti
on
pump is mounted on the f
rOl'lt
pl
ate,
Thus, the position of the
in
jection pump relative to the
engine is determined
by these two dowel pins.
The forward
end
of
crankshaft extends through the
tOOing
gear
case to drive the cooling fan throu
gh
crank·
shaft
puUey
_
An
oil
seal
is
pro';ded in the tinting gear
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