Mazda 626 1981 - 01-09

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--
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EXHAUST
INLET
Fig.
1-
32
Fig.
1-33
INL
ET
EXHAUST
Fig.
1-34
I : 9
-
37
mm
11.4567")
28mm
(1.1024"')
1.4
mm
(0.055"
1-
C-7
. Refacing Valve
Reface the valves with a
valv
e
re
facer, following the
instructions
of
the valve refacer manufacturer.
The inlet and exhaust valve face has a
45
degree angle.
Take
off
only the minimum
of
metal required
to
clean
the
vaJve
faces.
Note:
If
the
outer
edge
of
the
valve
(valve margin) becomes
less than 1.0
mm
(0.039
in)
from exccessive
grinding,
the
va
lv
e must
be
replaced.
1-C-8.
Inspecting and Refacing Valve
Seat
Inspect the valve seats for cracks, burrs, ridges
or
im-
proper angle and width.
If
necessary to reface the
valve
seats, use a valve seat grinder
or
valve seat cu
tter
and grind to a
45
degree angle. Do
not
grind any more
than
is
necessary to clean up the valve seat.
Note:
a)
If
the
valve
guides are
to
be replaced, this must
be done before refacing
the
valve seat.
b)
The valve seat ring
is
shrinkage-fitted in
the
cylinder
head. However,
the
seat ring
cannot
be
replaced
in view
of
maintaining strength.
1- C- 9. Checking Contact between
Valve
and
Valve
Seat
After the
valve
or
valve seat is ground, check
the
contact
between
the
valve and valve seat
as
follows:
I. Apply a thin coat
of
Prussian Blue on the valve
face and insert
the
valve into the valve seat.
2. Move
the
valve
up
and down with hand pressure,
rotating the valve.
3.
Remove the valve and observe the transfer
of
Prus-
sian Blue to the valve seat.
An
even transfer indicates accurate valve and valve
seat refacing.
If
uneven, the valve must be lapped into
the valve seat, using a suitable lapping compound.
4.
Check
the
valve
seat
width with a scale.
The valve seat width
is
1.4 mm
(0.055
in) on
the
both inlet and exhaust valve seats.
If
the
valve seat width
is
too
wide,
it
can be reduced
from inside
with
a
75°
seat
cutter
and from outside
with a
15°
seat cutter.