~,
~
~
@~
@
--
@ .
'
9'
I
""'~1
'
~
®~Q)
"
Q)
Ma.n
moving parts
Pis-tons.
Tbe
pislOns
are
of
an aluminum
aUoy
. The piston crown
is recesSt:d in such a
way
as.
to
promote
turbulence
ill
bo,h
precombustion chamber and main chamber.
As
seen
in
side view,
the
pis LOll
is
slightly t(lpcred
10
present
cm
incrc3sing.ly large diameter toward its skirt; and, a
s.
seen
in
plan
view
I H
is
slightly oval. These two
features;
ate calculated to
compenstlle
it
! roundness
for
une
qual
therm31 expansion at the operating temperaHlre.
The piston pin hole has its axis slighUy offset (oward
anti·thrust
sidt: in
order
to
minimize pis.ton noise. Each
plSlon
has
it
s weight
indicated
On
it
s -crown
by
punching.
All
four
pislons are required to
have
the Same weight
wi
thin a
give
n
to
lerance
so
that the vibrnlion of the
main
mo\':ing parts
during
operation
will
be
minimized.
CONSTRUCTION
AND FUNCTION
"p
1 ·
Crallkshiift
2·Rlng gear
3·Flvwheel
4oCfar'lk~haft
pulley
5.(:1;&r'I
k1.heh gear
6-Conne.!;
ti
ng
rod
be.3r
l"g
cap
7
·Connec
tmg
roOd
beat ing
(srnr
ll
s
~
8-Connec~ing
rod
9·Pi'lon
pm
bUPl1nll
10·Pinton
pin
1'·Pinon
12-Pisto
f'l
n\'\gs
F~om
of
engir'lO"
t
Pinon
wei
ght
Amoun(
of
offiCI
Piston
weight marking
and
pin hole O!fset
19
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