').
ENGINE
B
SECTION
B20
REMOVING
AND
REFITTING
THE
PISTONS
It
Is
most Important
that
the
connecting rod
protective
rubbers
are
securely
fitted
at
this stage.
First, thoroughly warm
the
piston
to
avoid
the
risk
of damaging
the
wrist
pin hole during
extraction
of
the
pin. This
Is
simply accomplished by applying
a heated electric iron for a few
moments
to
the
piston
crown.
Remove the clrcllps from
the
pistons
with
the
aid of
a pair of clrcllp pliers.
Withdraw
the
wrist
pins
using
a proprietary tool (Fig. B21).
T232
Fig. 821. Removing a piston
Alternatively in
the
absence
of such a tool
the
pistons may be removed by driving
out
the
wrist
pin
with a suitable drift
after
warming
the
pistons
as
already described.
However,
this
Is
not
a
recomm·
ended practice, and may
result
In
a damaged piston
or
distorted
connecting
rod.
The
need
for
care
cannot
be
over-stressed
when
using
this
method
to
remove
the
wrist
pin.
When
the
pistons
are
removed
they
should be sUitably
scrJbed Inside so
that
they
can be
refitted
In
their
orlgnlal positions.
Each
piston has
"FRONT"
stamped on
the
crown.
When
refitting
the
pistons first place
the
Inner
drclip
In
position
to
act
as
a
stop,
then
press the
wrist pin Into position using
the
proprietary
tool.
It
Is
advlsable.to renew
the
six c1rcllps;
this
can be
done for negllble cost.
If
there
Is
no
alternative
but
to
drive
the
wrist
pin
Into position with a drift,
the
piston should first be
heated
to
100 degrees
centigrade
(boiling
water
temperature)
to
assist assembly.
Dry
thoroughly
before use.
Finally,
check
that
all
the
wrist
pin
retainer
clrcllps
are
In
position, and
are
correctly
fitted.
This
is
extremely
important.
B23
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