SUBARU LEGACY 1999 Service Repair Manual

3. Camshaft
A: REMOVAL
1. RELATED PARTS
Remove timing belt, camshaft sprockets and related parts.
<Ref. to 2-3b [W2A0].>
2. CAMSHAFT
S2M0298A
(1) Spark plug cord
(2) Rocker cover (LH)
(3) Rocker cover gasket (LH)(4) Intake camshaft cap (LH)
(5) Intake camshaft (LH)
(6) Exhaust camshaft cap (LH)(7) Exhaust camshaft (LH)
1) Remove camshaft position sensor (LH side
only).
2) Remove spark plug cord.
3) Remove rocker cover and gasket.4) Loosen intake camshaft cap bolts equally, a
little at a time in alphabetical sequence shown in
figure.
B2M1393B
5) Remove camshaft caps and intake camshaft.
30
2-3b[W3A1]SERVICE PROCEDURE
3. Camshaft

6) Loosen exhaust camshaft cap bolts equally, a
little at a time in alphabetical sequence shown in
figure.
B2M1394B
7) Remove camshaft caps and exhaust camshaft.
CAUTION:
Arrange camshaft caps in order so that they
can be installed in their original positions.
8) Similarly, remove right-hand camshafts and
related parts.
B: INSPECTION
1. CAMSHAFT
1) Measure the bend, and repair or replace if nec-
essary.
Limit:
0.020 mm (0.0008 in)
G2M0746
2) Check journal for damage and wear. Replace if
faulty.
3) Measure outside diameter of camshaft journal.
If the journal diameter is not as specified, check the
oil clearance.
Camshaft journal
Front Center, rear
Standard31.946 Ð 31.963 mm
(1.2577 Ð 1.2584 in)27.946 Ð 27.963 mm
(1.1002 Ð 1.1009 in)
4) Measurement of the camshaft journal oil clear-
ance
(1) Clean the bearing caps and camshaft jour-
nals.
(2) Place the camshafts on the cylinder head.
(Without installing valve rocker.)
(3) Place plastigauge across each of the cam-
shaft journals.
(4) Install the bearing caps.
<Ref. to 2-3b [W3C1].>
CAUTION:
Do not turn the camshaft.
(5) Remove the bearing caps.
(6) Measure the widest point of the plastigauge
on each journal.
If the oil clearance exceeds the limit, replace the
camshaft. If necessary, replace the camshaft
caps and cylinder head as a set.
Standard oil clearance:
0.037 Ð 0.072 mm (0.0015 Ð 0.0028 in)
Limit:
0.10 mm (0.0039 in)
B2M1216
(7) Completely remove the plastigauge.
31
[W3B1]2-3bSERVICE PROCEDURE
3. Camshaft

5) Check cam face condition; remove minor faults
by grinding with oil stone. Measure the cam height
H; replace if the limit has been exceeded.
Cam height: H
Standard:
Intake:
42.20 Ð 42.30 mm (1.6614 Ð 1.6654 in)
Exhaust:
Front: 42.50 Ð 42.60 mm (1.6732 Ð
1.6772 in)
Rear: 41.40 Ð 41.50 mm (1.6299 Ð 1.6339
in)
Limit:
Intake:
42.04 mm (1.6551 in)
Exhaust:
Front: 42.34 mm (1.6669 in)
Rear: 41.24 mm (1.6236 in)
Cam base circle diameter A:
28.0 mm (1.102 in)
B2M1209A
6) Measure the thrust clearance of camshaft with
dial gauge. If the clearance exceeds the limit,
replace caps and cylinder head as a set. If neces-
sary replace camshaft.
Standard:
0.040 Ð 0.080 mm (0.0016 Ð 0.0031 in)
Limit:
0.1 mm (0.004 in)
B2M1217
32
2-3b[W3B1]SERVICE PROCEDURE
3. Camshaft

C: INSTALLATION
1. CAMSHAFT
S2M0298C
(1) Intake camshaft (LH)
(2) Exhaust camshaft (LH)
(3) Intake camshaft cap (LH)
(4) Exhaust camshaft cap (LH)
(5) Rocker cover gasket (LH)(6) Rocker cover (LH)
(7) Spark plug cordTightening torque: N´m (kg-m, ft-lb)
T1:
4.9±0.5 (0.5±0.05, 3.6±0.4)
T2:10±0.7 (1.0±0.07, 7.2±0.5)
T3:20±2 (2.0±0.2, 14.5±1.4)
33
[W3C1]2-3bSERVICE PROCEDURE
3. Camshaft

1) Camshaft installation
Apply engine oil to cylinder head at camshaft bear-
ing location before installing camshaft. Install cam-
shaft so that rocker arm is close to or in contact
with ªbase circleº of cam lobe.
CAUTION:
IWhen camshafts are positioned as shown in
figure, camshafts need to be rotated at a mini-
mum to align with timing belt during installa-
tion.
IRight-hand camshaft need not be rotated
when set at position shown in figure.
Left-hand intake camshaft: Rotate 80É clock-
wise.
Left-hand exhaust camshaft: Rotate 45É
counter-clockwise.
B2M1200A
2) Camshaft cap installation
(1) Apply fluid packing sparingly to cap mating
surface.
CAUTION:
Do not apply fluid packing excessively. Failure
to do so may cause excess packing to come
out and flow toward oil seal, resulting in oil
leaks.
Fluid packing:
THREE BOND 1215 or equivalent
G2M0752
(2) Apply engine oil to cap bearing surface and
install cap on camshaft as shown by identifica-
tion mark.
(3) Gradually tighten cap in at least two stages
in alphabetical sequence shown in figure, and
then tighten to specified torque.
B2M1395B
(4) Similarly, tighten cap on exhaust side.
After tightening cap, ensure camshaft rotates
only slightly while holding it at ªbaseº circle.
34
2-3b[W3C1]SERVICE PROCEDURE
3. Camshaft

3) Camshaft oil seal installation
Apply grease to new oil seal lips and press onto
front end of camshaft by using ST1 and ST2.
CAUTION:
Use a new oil seal.
ST1 499587100 OIL SEAL INSTALLER
ST2 499597000 OIL SEAL GUIDE
G2M0754
4) Rocker cover installation
(1) Install gasket on rocker cover.
Install peripheral gasket and ignition coil gasket.
(2) Apply fluid packing to four front open edges
of peripheral gasket.
Fluid packing:
THREE BOND 1215 or equivalent
S2M0300A
(3) Install rocker cover on cylinder head.
Ensure gasket is properly positioned during
installation.
5) Install ignition coil.
6) Install cam angle sensor.
7) Similarly, install parts on right-hand side.
2. RELATED PARTS
Install timing belt, camshaft sprockets and related
parts.
<Ref. to 2-3b [W2C0].>
35
[W3C2]2-3bSERVICE PROCEDURE
3. Camshaft

4. Cylinder Head
A: REMOVAL
1. RELATED PARTS
1) Remove V-belt.
2) Remove generator, air conditioner compressor
and brackets.
3) Remove hoses and tubes from cylinder block.
4) Disconnect each connector and/or remove con-
nector bracket.5) Remove intake manifold assembly and gasket.
6) Remove camshaft position sensor.
7) Remove timing belt, camshaft sprockets and
related parts.
<Ref. to 2-3b [W2A0].>
8) Remove rocker cover, camshafts and related
parts.
<Ref. to 2-3b [W3A2].>
2. CYLINDER HEAD
S2M0421A
(1) Bolt
(2) Cylinder head bolt(3) Cylinder head
(4) Cylinder head gasket
1) Remove oil level gauge guide attaching bolt
(LH side only).
36
2-3b[W4A1]SERVICE PROCEDURE
4. Cylinder Head

2) Remove cylinder head bolts in alphabetical
sequence shown in figure.
CAUTION:
Leave bolts (A) and (D) engaged by three or
four threads to prevent cylinder head from fall-
ing.
B2M1397C
3) While tapping cylinder head with a plastic
hammer, separate it from cylinder block.
Remove bolts (A) and (D) to remove cylinder head.
B2M1397C
4) Remove cylinder head gasket.
5) Similarly, remove right-hand cylinder head.
B: DISASSEMBLY
S2M0420A
(1) Valve shim
(2) Valve lifter
(3) Valve retainer key(4) Valve retainer
(5) Valve spring
(6) Valve oil seal(7) Valve spring seat
(8) Intake valve
(9) Exhaust valve
1) Remove valve shims and valve lifters.
37
[W4B0]2-3bSERVICE PROCEDURE
4. Cylinder Head

2) Compress the valve spring and remove the
valve spring retainer key. Remove each valve and
valve spring.
ST1 498267600 CYLINDER HEAD TABLE
ST2 499718000 VALVE SPRING REMOVER
CAUTION:
IKeep removed parts in order for re-installing
in their original positions.
IMark each valve to prevent confusion.
IUse extreme care not to damage the lips of
the intake valve oil seals and exhaust valve oil
seals.
B2M1221A
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 check.2) Measure the warping of the cylinder head sur-
face that mates with crankcase by using a straight
edge and thickness 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:
0.3 mm (0.012 in)
Standard height of cylinder head:
127.5 mm (5.02 in)
CAUTION:
Uneven torque for the cylinder head nuts can
cause warping. When reassembling, pay spe-
cial attention to the torque so as to tighten
evenly.
G2M0760
38
2-3b[W4C1]SERVICE PROCEDURE
4. Cylinder Head

2. VALVE SEAT
Inspect intake and exhaust valve seats, and cor-
rect the contact surfaces with valve seat cutter if
they are defective or when valve guides are
replaced.
Valve seat width: W
Intake
Standard
1.0 mm (0.039 in)
Limit
1.7 mm (0.067 in)
Exhaust
Standard
1.5 mm (0.059 in)
Limit
2.2 mm (0.087 in)
G2M0761
3. VALVE GUIDE
1) Check the clearance between valve guide and
stem. The clearance can be checked by measur-
ing 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 Ð 0.062 mm (0.0014 Ð 0.0024 in)
Exhaust
0.040 Ð 0.067 mm (0.0016 Ð 0.0026 in)
Limit
0.15 mm (0.0059 in)
Valve guide inner diameter:
6.000 Ð 6.015 mm (0.2362 Ð 0.2368 in)
Valve stem outer diameter:
Intake
5.950 Ð 5.965 mm (0.2343 Ð 0.2348 in)
Exhaust
5.950 Ð 5.965 mm (0.2343 Ð 0.2348 in)
2) If the clearance between valve guide and stem
exceeds the specification, replace guide as fol-
lows:
(1) Place cylinder head on ST1 with the com-
bustion 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 498267600 CYLINDER HEAD TABLE
ST2 499767200 VALVE GUIDE REMOVER
G2M0762
(3) Turn cylinder head upside down and place
ST as shown in the figure.
ST 498267700 VALVE GUIDE ADJUSTER
G2M0763
(4) Before installing new valve guide, make
sure that neither scratches nor damages exist
on the inside surface of the valve guide holes in
cylinder head.
39
[W4C3]2-3bSERVICE PROCEDURE
4. Cylinder Head