SUBARU LEGACY 1997 Service Repair Manual

3. RELATED PARTS
1) Install valve rocker assembly.

B2M0418B
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 5±1 (0.5±0.1, 3.6±0.7)
T2: 12±1 (1.2±0.1, 8.7±0.7)
2) Install timing belt, camshaft sprockets and related parts.

6. Cylinder Head
A: REMOVAL
1. INTAKE MANIFOLD
1) Release fuel pressure.
2) Drain engine coolant.
3) Remove intake manifold.
4) Remove engine coolant pipe.
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2-3SERVICE PROCEDURE
5. Camshaft - 6. Cylinder Head

2. CYLINDER HEAD
B2M0119A
1) Remove timing belt, camshaft sprocket and related
parts.

2) Remove oil level gauge guide attaching bolt (left hand
only) and oil level gauge guide.
B2M0120A
3) Remove cylinder head bolts in numerical sequence
shown in Figure.
CAUTION:
Leave bolts

1and
3engaged by three or four threads
to prevent cylinder head from falling.
4) While tapping cylinder head with a plastic hammer,
separate it from cylinder block.
Remove bolts

1and
3to remove cylinder head.
5) Remove cylinder head gasket.
CAUTION:
Do not scratch the mating surface of cylinder head and
cylinder block.
6) Similarly, remove right side cylinder head.
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2-3SERVICE PROCEDURE
6. Cylinder Head

B: DISASSEMBLY
B2M0121A
1) Remove rocker cover.
2) Remove valve rocker assembly.

3) Remove camshaft and support.

4) Place cylinder head on ST.
ST 498267200 CYLINDER HEAD TABLE
B2M0386A
5) Set ST on valve spring. Compress valve spring and
remove the valve spring retainer key. Remove each valve
and valve spring.
ST 499718000 VALVE SPRING REMOVER
CAUTION:
Mark each valve to prevent confusion.
Use extreme care not to damage the lips of the
intake valve oil seals and exhaust valve oil seals.
6) Removal of plug (cylinder head LH)
CAUTION:
Do not remove plug unless necessary.
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2-3SERVICE PROCEDURE
6. Cylinder Head

C: INSPECTION
1. CYLINDER HEAD
1) Make sure that no crack or other damage exists. In
addition to visual inspection, inspect important areas by
means of red lead check.
Also make sure that gasket installing surface shows no
trace of gas and water leaks.
2) Place cylinder head on ST.
ST 498267200 CYLINDER HEAD TABLE
G2M0148
3) Measure the warping of the cylinder head surface that
mates with crankcase by using a straight edge and thick-
ness gauge.
If the warping exceeds 0.05 mm (0.0020 in), regrind the
surface with a surface grinder.
Warping limit:
0.05 mm (0.0020 in)
Grinding limit:
0.1 mm (0.004 in)
Standard height of cylinder head:
98.3 mm (3.870 in)
CAUTION:
Uneven torque for the cylinder head bolts can cause
warping. When reassembling, pay special attention to
the torque so as to tighten evenly.
G2M0149
B2M0074
2. VALVE SEAT
Inspect intake and exhaust valve seats, and correct the
contact surfaces with valve seat cutter if they are defective
or when valve guides are replaced.
Valve seat width: W
Intake
Standard
0.7 mm (0.028 in)
Limit
1.4 mm (0.055 in)
Exhaust
Standard
1.4 mm (0.055 in)
Limit
1.8 mm (0.071 in)
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2-3SERVICE PROCEDURE
6. Cylinder Head

B2M0387A
B2M0076A
3. VALVE GUIDE
1) Check the clearance between valve guide and stem.
The clearance can be checked by measuring the outside
diameter of valve stem and the inside diameter of valve
guide with outside and inside micrometers respectively.
Clearance between the valve guide and valve stem:
Standard
Intake
0.035—0.062 mm (0.0014—0.0024 in)
Exhaust
0.040—0.067 mm (0.0016—0.0026 in)
Limit
0.15 mm (0.0059 in)
Valve guide inner diameter:
6.000—6.012 mm (0.2362—0.2367 in)
Valve stem outer diameters:
Intake
5.950—5.965 mm (0.2343—0.2348 in)
Exhaust
5.945—5.960 mm (0.2341—0.2346 in)
G2M0150
2) If the clearance between valve guide and stem exceeds
the specification, replace guide as follows:
(1) Place cylinder head on ST1 with the combustion
chamber upward so that valve guides enter the holes
in ST1.
(2) Insert ST2 into valve guide and press it down to
remove valve guide.
ST1 498267200 CYLINDER HEAD TABLE
ST2 499767200 VALVE GUIDE REMOVER
G2M0151
(3) Turn cylinder head upside down and place ST as
shown in the Figure.
ST 499767000 VALVE GUIDE ADJUSTER
B2M0388A
(4) Before installing new oversize valve guide, make
sure that neither scratches nor damages exist on the
inside surface of the valve guide holes in cylinder head.
(5) Put new valve guide, coated with sufficient oil, in
cylinder, and insert ST1 into valve guide. Press in until
the valve guide upper end is flush with the upper sur-
face of ST2.
ST1 499767200 VALVE GUIDE REMOVER
ST2 499767000 VALVE GUIDE ADJUSTER
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2-3SERVICE PROCEDURE
6. Cylinder Head

B2M0077A
(6) Check the valve guide protrusion.
Valve guide protrusion: L
17.5—18.0 mm (0.689—0.709 in)
B2M0078
(7) Ream the inside of valve guide with ST. Gently
rotate the reamer clockwise while pressing it lightly into
valve guide, and return it also rotating clockwise. After
reaming, clean valve guide to remove chips.
ST 499767400 VALVE GUIDE REAMER
CAUTION:
Apply engine oil to the reamer when reaming.
If the inner surface of the valve guide is torn, the
edge of the reamer should be slightly ground with an
oil stone.
If the inner surface of the valve guide becomes lus-
trous and the reamer does not chips, use a new reamer
or remedy the reamer.
(8) Recheck the contact condition between valve and
valve seat after replacing valve guide.
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2-3SERVICE PROCEDURE
6. Cylinder Head

G2M0153
4. INTAKE AND EXHAUST VALVE
1) Inspect the flange and stem of valve, and replace if
damaged, worn, or deformed, or if“H”is less than the
specified limit.
H:
Intake
Standard
1.0 mm (0.039 in)
Limit
0.8 mm (0.031 in)
Exhaust
Standard
1.2 mm (0.047 in)
Limit
0.8 mm (0.031 in)
Valve overall length:
Intake
101.0 mm (3.976 in)
Exhaust
101.2 mm (3.984 in)
2) Put a small amount of grinding compound on the seat
surface and lap the valve and seat surface. Also refer to 2.
VALVE SEAT 2-3 [W6C2] at this time. Install a new intake
valve oil seal after lapping.
G2M0154
5. VALVE SPRINGS
1) Check valve springs for damage, free length, and ten-
sion. Replace valve spring if it is not to the specifications
presented below.
2) To measure the squareness of the valve spring, stand
the spring on a surface plate and measure its deflection at
the top using a try square.
Free length 44.05 mm (1.7342 in)
Squareness 2.5°, 1.9 mm (0.075 in)
Tension/spring height174.6—200.1 N
(17.8—20.4 kg, 39.2—45.0 lb)/ 36.0 mm
(1.417 in)
405.0—458.0 N
(41.3—46.7 kg, 91.1—103.0 lb)/
28.2 mm (1.110 in)
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2-3SERVICE PROCEDURE
6. Cylinder Head

B2M0389A
6. INTAKE AND EXHAUST VALVE OIL SEAL
Replace oil seal with new one, if lip is damaged or spring
out of place, or when the surfaces of intake valve and valve
seat are reconditioned or intake valve guide is replaced.
1) Place cylinder head on ST1.
2) Press-fit oil seal to the specified dimension indicated in
the Figure by using ST2.
ST1 498267200 CYLINDER HEAD TABLE
ST2 498857100 VALVE OIL SEAL GUIDE
CAUTION:
Apply engine oil to oil seal before press-fitting.
When press-fitting oil seal, do not use hammer or
strike in.
Differentiate between intake valve oil seal and
exhaust valve oil seal by noting their difference in
color.
Color of rubber part:
Intake [Black]
Exhaust [Brown]
Color of spring part:
Intake [White]
Exhaust [White]
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2-3SERVICE PROCEDURE
6. Cylinder Head

D: ASSEMBLY
B2M0121B
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 5±1 (0.5±0.1, 3.6±0.7)
T2: 10 (1.0, 7)
T3: 12±1 (1.2±0.1, 8.7±0.7)
T4: 16 (1.6, 12)
1) Install plug (cylinder head LH) by using ST.
ST 499587100 OIL SEAL INSTALLER
2) Installation of valve spring and valve
(1) Place cylinder head on ST.
ST 498267200 CYLINDER HEAD TABLE
(2) Coat stem of each valve with engine oil and insert
valve into valve guide.
CAUTION:
When inserting valve into valve guide, use special care
not to damage the oil seal lip.
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2-3SERVICE PROCEDURE
6. Cylinder Head

B2M0386A
(3) Install valve spring and retainer.
CAUTION:
Be sure to install the valve springs with their painted
facing towards the valve spring retainer.
(4) Set ST on valve spring.
ST 499718000 VALVE SPRING REMOVER
(5) Compress valve spring and fit valve spring retainer
key.
B2M1210A
(6) After installing, tap valve spring retainers lightly
with wooden hammer for better seating.
3) Install camshaft and support.

4) Install valve rocker assembly.

5) Install rocker cover.
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2-3SERVICE PROCEDURE
6. Cylinder Head