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apply a thin
layer
of abrasive
paste to the valve head
chamfer
and, after first
insert ing the valve
with
the pressing -out
spring
into
the
gu.ide
bushing, fit
an appliance
TIP-1366 on
the
end
of valve
stern for rotation of
the
valve;
rotate
the valve
by means
of
the appliance in both directions
so
that
the valve
turn
s
progressively
in one direction
or
the other
.
While
rotating the valve, periodically press
it down to
the seat.
f'ig.
16.
Checking
the
valve seat
for
play
Lap
the
head
into
the seat careful ly so
as not to remove too much
met
a
l from
the working chamfers
as this
will
reduce the number
of
permissible
repairs. Toward
s
the
end of
lapping, reduce the amount
of
paste
and, at the
final
stage,
perform the lapping using only
a
pure oil.
Continue
the lapping until
a
un iform lust
reless
colour
appears
on
the working surfaces of
the
valve
head
and seat, which
is
an indica-
tion of
sa tisfacto
ry lapping.
After lapping, thoroughly wash
the
valves, va
lve
seats,
gu.ide
bushir;gs, throat and cylinder head compression chamber to
comple-
tely
remove
all the abrasive
paste,
then
wipe them dry
with a
clean
cloth.
52
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