Subaru 2006 Legacy, Manual

Page: 812 / 4302

ME(H4SO)-54
Cylinder Head
MECHANICAL
20.Cylinder Head
A: REMOVAL
1) Remove the V-belts. <Ref. to ME(H4SO)-36,
REMOVAL, V-belt.>
2) Remove the crank pulley. <Ref. to ME(H4SO)-
38, REMOVAL, Crank Pulley.>
3) Remove the timing belt cover. <Ref. to
ME(H4SO)-39, REMOVAL, Timing Belt Cover.>
4) Remove the timing belt. <Ref. to ME(H4SO)-40,
REMOVAL, Timing Belt.>
5) Remove the cam sprocket. <Ref. to ME(H4SO)-
45, REMOVAL, Cam Sprocket.>
6) Remove the intake manifold. <Ref. to
FU(H4SO)-11, REMOVAL, Intake Manifold.>
7) Remove the bolt which installs the A/C compres-
sor bracket on cylinder head.
8) Remove the valve rocker assembly. <Ref. to
ME(H4SO)-47, REMOVAL, Valve Rocker Assem-
bly.>
9) Remove the camshaft. <Ref. to ME(H4SO)-50,
REMOVAL, Camshaft.>
10) Remove the cylinder head bolts in alphabetical
sequence as shown in the figure.
NOTE:
Leave bolts (a) and (c) engaged by three or four
threads to prevent the cylinder head from falling.
11) While tapping the cylinder head with a plastic
hammer, separate it from cylinder block.
12) Remove the bolts (a) and (c) to remove cylinder
head.
13) Remove the cylinder head gasket.
CAUTION:
Be careful not to scratch the mating surface of
the cylinder block and cylinder head.
14) Similarly, remove the right side cylinder head.
B: INSTALLATION
1) Install the cylinder head to the cylinder block.
CAUTION:
Be careful not to scratch the mating surface of
cylinder head and cylinder block.
NOTE:
Use a new cylinder head gasket.
(1) Clean the bolt threads and the bolt holes in
the cylinder block.
CAUTION:
To avoid erroneous tightening of the bolts,
clean out the bolt holes sufficiently by blowing
with compressed air to eliminate engine cool-
ant etc.
(2) Apply a sufficient coat of engine oil to the
washer and bolt thread.
(3) Tighten all bolts to 40 N·m (4.1 kgf-m, 29.5
ft-lb) in alphabetical order.
(4) Retighten all bolts to 95 N·m (9.7 kgf-m,
70.1 ft-lb) in alphabetical order.
CAUTION:
If the bolt makes stick-slip sound during tight-
ening, repeat the procedure from step (1). In
this case, the cylinder head gasket can be re-
used.
(5) Loosen all the bolts by 180° in the reverse
order of installing, and loosen them further by
180°.
(6) Tighten all bolts to 10 N·m (1.0 kgf-m, 7.4 ft-
lb) in alphabetical order.
(7) Retighten all bolts to 30 N·m (3.1 kgf-m,
22.1 ft-lb) in alphabetical order.
(8) Retighten all bolts to 60 N·m (6.1 kgf-m,
44.3 ft-lb) in alphabetical order.
(9) Retighten all bolts by 80 — 90° in alphabet-
ical order.
(10) Retighten all bolts by 40 — 45° in alphabet-
ical order.
CAUTION:
The tightening angle of the bolt should not ex-
ceed 45°.
ME-02745
( c )
( b )
( f )
( d )
( a )
( e )
ME-02745
( c )
( b )
( f )
( d )
( a )
( e )
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