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R U C G E R I N I
M O T O R I
tighten the pipa fitting.
PUt
accale-
rator contro1 i n its Maximum POSitiOn.
2 1 By hand turn the fiywhaai in the same
rotation sense of the engine perfor-
ming slowly compression strokes.
31 During these operations the fuel wiII
gush
out
from the pipe fitting untill
it stops flowing. The position a t whlch
the fuel will stop flowlng is the injec-
tion
starting point.
If when fuel stop flowing, the mark
iP
on the flywheel is befo:e,the'~mark
P M C m the static part of engine
that
means
that
thickness of shims be-
neath the purnp flange must be Incri-
sed.
The contrary must
be
done
if
the po-
sition is advanced.
The above stated clearly indicates
that
the thickness and number of gaskets
is in
connection with-injection timing.
in
case the pump must be repla-
ced by
E
new une. it 1s advlsable t u
check the injection tirnlng
ES
from a-
bove instructions.
CHECKING THE TIME OF INJECTION
We suppose you ara Informed that the fuai
capacity per plunger stroke
is
calibrated
by means qf
an
excentric boit
[ill.
6Al
EC-
carding t o the maximum power rating of
the engiw during the break-in at'the fa-
ctory;
For an approxlrnate checking operation do
11
determinate the lnjectian stretlng polnt
ES
previously described.
21 rotate the flywheel up t o the point In
whlch
the oil
S t E r t S
flowhlg
agaln-
This positlon reeresents the lniection
end point.
ES
fOllOWS:
CYLINDER BORING
This operation needs the pistons
o f ~
major
segments.
The
company suppiies the pl-
stons with the followlng:
80.5
-
81
~
81,s mm.
-
RD 80
-
81
-
8OV
85,5
-
86
-
86.5 mm.
-
RD 850
-
850V
90.5
-
9 1
-
91,5
mm.
-
RD 900
.
901
92.5
-
93
-
93.5 mm.
-
RD920
-
92OV
95.5
-
96
mm.
-
RD
950
-
950L
90ilA
-
gOi/AD.
The cylinder must therefore
be
bored tu
OnE
of these sizes, with toierance up t o
+
0,03 mm.
When orderlng please state the oversize
wanted.
CRANKPIN GRINDING FOR RD
80
-
81
aov
in
case
af
crankpin grlnding baarings ac-
cording t o the following underslzes are
available: 0.25
-
0,50
-
U.75
mm. hominai
diameter
40 mm.1.
The
following table shows the different
diameters far crankpin grinding according
t o the requlred undersiss:
0 min.
0
max.
1st. Undersize
39,744
39,760
2nd. Undersize
39,494
39.510
3rd. Undersize
39,244
39,260
CRANKPIN GRINDING FOR SERIES RD
In
case of crankpin grlndlng bearings ac-
cording t o the following undersizes ara
avaiiabia:
0.25
-
0.50
-
0.75 mm. [nominal
diameter
45
mm.1.
Tha following table shows the different
diameters for crankpin grinding according
t o
tha
required undersizes:
0
min.
0
max.
1st: Undersize
44,744
44,760
2nd. Undersize
44,494
44.510
3rd. Undersize
44,244
44,260
GRINDING MAIN JOURNALS
The
sama
underslzes ara available reffe-
red t u the nominal diameter
[42 mm.1.
The following tabie shows the different
diameter t o grind accordlng to
the
requi-
red underslzes:
The
corresponding bearings ara
EISO
avai-
lable:
0
min.
0 max.
ist.
Undersize
41,734
41,750
2nd. Undersize
41,484
41,500
3rd. Undersize
41,234
41.250
WE
also supply
the main bearlngs i n or-
der t o obtain the required clearance.
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