Subaru 1600 Service Manual page 84

The correction procedure is as fol-
lows:
a. Precautions
(I) When valve seat correction is
required, check intake and exhaust
valve stems and valve guides for
wear, and the springs for square-
ness, tension, etc. If defective,
replace them before proceeding the
valve seat correction work.
(2) When reconditioning valve and
valve seat surfaces, remove intake
valve oil seals. Install new oil seals
with oil after completing the work.
b. Reface valve seat with valve seat
cutters or grinders to the dimen·
sions shown in the above figure.
A5·288
Fig. 3-80 Refacing valve seat with
valve seat cutter
NOTE:
Refacing of the valve seat should be
closely coordinated with the refacing
of the valve face, so that the finished
seat and valve face will be concentric
and specified interference angle will be
maintained.
ENGINE
c. Apply a thin coat of Prussian blue
or red lead to the contacting sur-
face of valve to see the contact·
ing condition of valve and valve
seat.
d. Rotate valve with light pressure.
If the blue or red lead is transferred
to the center of the valve seat sur-
face, the contact is satisfactory.
e. In case of improper contact, apply
a small amount of grinding com·
pound (about #400) on the valve
surface and lap the valve and seat
surface so that they obtain proper
fit.
NOTE:
The above is important because the
valve and seat must have a gastight fit.
f. Clean valves and valve seats to
remove chips.
4) Inspect exhaust pipe stud bolts
installed on the cylinder head, and
replace if defective.
t.
p,;;;:,:
I,ng~
of ,IUd
b9
ltS
54 mm (2.13 in)
-~----~-~-~----~
3. Valve Guide
Check the clearance between valve
guide and stem. The clearance can be
checked by measuring the outside
diameter of valve
st~m
and the inside
diameter of valve guide wi th outside
and inside micrometers respectively.
If the clearance between valve
guide and stem exceeds the specifica-
tion, replace guide as follows:
----
Specifications for valve stem and valve gUide
~~--
earance Standard cI
between val
and valve st
ve gUide
em
arance
ve guide
Limit of de
between val
and valve st em
Intake
'---
Exhaust
--~--
Intake
Exhaust
--------'----------
Standard in
guide
Standard di
valve stem
side diameter of valve
--
ameter of
Intake
Exhaust
0.035
0.065 mm (0.0014 - 0.0026 in)
~ ~-
0.040
-~
0.070 mm (0.0016 - 0.0028 in)
--
0.1 5 mm (0.0059 in)
~----
0.15 mm (0.0059 in)
8.000 - 8.0 IS mm (0.31 SO - 0.3156 in)
7.950 - 7.965 mm (0.3130 - 0.3136 in)
7.945 - 7.960 mm (0.3128 - 0.3134 in)
----- ------ ----------
~
a. Place cylinder head on Cylinder
Head Table (399765101) with the
combustion chamber upward so
that valve guides enter the holes
in Cy linder Head Table.
b. Insert Valve Guide Remover
(899764104) into valve guide and
press it down to remove valve
guide.
VaJve Guide Remover
(899764104)
2 Cylinder head table
(399765101)
Fig.3-81 Removing valve guide
A5·289
c. Turn cylinder head upside 4Jown
and place Valve Guide Adjuster
(899768602 for exhaust valve guide,
899768603 for intake valve guide)
as shown in the figure.
Valve gutde adjuster
(899768603)
Valve guide adjuster
(899768602)
Fig. 3-82 Valve guide adjusters
d. Before installing new valve guide,
make sure that neither scratches
nor damages exist on the inside sur-
face of the valve guide holes in
cylinder head.
e. Put new valve guide, coated with
sufficient oil, in cylinder, and
insert Valve Guide Remover
(899764104) into valve guide.
Press in until the valve guide upper
end is flush with the upper surface
of Valve Guide Adjuster.