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190
6
7
8
OPERATION
No.
ID
39
1
- 3 : Overhauling
the suspension pump
for
example
0.20
mm.
Since
the
clearance
must
be between
0.05
and
0. 09 mm
the
thickness
of the
washer
must
be
0. 20
- 0.09
= 0.11
mm.
Select
a washer
of the
thickness
determined
above
or
one
of
the
next
greatest
thickness.
In
this
example
the
latter
would
be
0.15
mm.
There must always be a clearance
(before
tightening)
between
the
end
cap
and
the
body.
Dismantle
the
parts.
To
prepare
the
parts
:
I
Place
the
spring
cup
(13)
and
then
the
circlip
(12)
on
the
stem
of the
piston.
Clean
the
cylinder
and
the
piston
with
alcohol.
Dry
in
a jet
of
compressed
air
and
carefully
wipe
the
piston
and
the
bore
of
the
cylinder
with
a clean
soft
cloth.
Impurities
present
can
cause
scoring
which
may
lead
to
a leakage
of the
suspension
fluid
into
the
engine.
First
smear
the
seal
(10)
with
suspension
fluid
or
even
better
with
castor
oil
and
place
it
in position
in
the
groove
in
the
cylinder
(cone
2227-T,
see
Pl.
89,
fig.
13).
NOTE
- The
ring
seals
(7)
and
(10)
are
almost
of
the
same
size.
They
can
be
distinguished
by
placing
them
one
on
top
of the
other;
the
ring
seal
with
the
smaller
outside
diameter
is the
ring
seal
(10).
This
ring
seal
is
also
harder
(krylene)
than
the
ring
seal
(7).
Smear
the
piston
and
the
cylinder
bore
with
suspension
fluid.
Fit
the
spring
(11)
and
insert
the
piston
in the
cylinder
Make
sure
that
it
slides
easily
in
the
cylinder
and
that
the
circlip
is
in position
in the
spring
cup.
Smear
seal
(7)
with
suspension
fluid
and
insert
it
in the
groove
in
the
seating.
The
seal
must
be
fitted
on
the
outer
diameter
of the
groove
and
there
must
be
a certain
amount
of
clearance
on
the
inner
diameter
. . . . . . . . . . . . . . .
To
fit
the
pump
:
Place
the
end
cap
on
the
raised
blocks
so that
the
end
cap
is level.
Place
on
the
end
cap
the
shim
(5)
determined
in paragraph
5,
the
ring
seal
(4)
smeared
with
suspension
fluid,
the
spring
(2)
(see
illustration
for
location)
and
the
valve
(3).
Compress
the
spring
(2)
by
pressing
with
the
finger
on
the
valve
(3)
until
the
valve
penetrates
into
the
bore
of
the
end
cap.
Slide
the
seating
bracket
(6)
on
the
valve
until
it is
centred
on
the
end
cap
(the
seating
(6)
is
fitted
with
the
ring
seal
(7)
located
towards
the
top).
Position
the
piston-cylinder
assembly
on
the
seating
and
centre
it.
While
holding
the
seating
and
pressing
on
the
eQd
cap,
offer
up
the
body
of the
pump
on
the
assembly
of the
parts
(see
fig.
2 for
positioning
of
the
holes).
Through
the
bore
for
the
plunger,
push
on
the
end
of
the
piston
(8)
so as
to
retain
the
valve
in
position,
then
put
the
body
on
the
different
parts,
pressing
firmly.
Be
careful
not
to damage
the
sealing
ring
(4)
when
sliding
on
the
body.
The
body
should
seat
on
the
shim
(5),
if not,
the
valve
is not
in
position,
the
parts
have
wedged,
the
operation
must
be
started
over
again.
Hold
the
assembly
by
hand
and
tighten
the
screw
to
12+
to
13;
ft.
lbs
(1.7
to
1.9
m.
kg)
. . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT
NOTE
- On
no
account
must
the
end
cap
or
body
be
twisted
to
obtain
the
correct
location
of the
inlet
and
outlet
holes.
This
can
cause
damage
to
the
seals
and
can
cause
leakage.
Put
the
roller
and
plunger
assembly,
previously
oiled
(SAE
20
engine
oil)
in
the
bore
of
the
pump
body.
Check
that
the
assembly
slides
easily
when
pressing
on
the
roller.
ID
19
TOOLS
Cone
2227-T
12 mm
socket
torsion
spanner
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