Cylinder Head - Subaru Legacy 2004 Service Manual

20.Cylinder Head

A: REMOVAL
1) Remove the V-belts. <Ref. to ME(H4SO 2.0)-38,
REMOVAL, V-belt.>
2) Remove the crank pulley. <Ref. to ME(H4SO
2.0)-40, REMOVAL, Crank Pulley.>
3) Remove the timing belt cover. <Ref. to
ME(H4SO 2.0)-42, REMOVAL, Timing Belt Cov-
er.>
4) Remove the timing belt. <Ref. to ME(H4SO 2.0)-
43, REMOVAL, Timing Belt.>
5) Remove the cam sprocket. <Ref. to ME(H4SO
2.0)-48, REMOVAL, Cam Sprocket.>
6) Remove the intake manifold. <Ref. to FU(H4SO
2.0)-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 2.0)-51, REMOVAL, Valve Rocker As-
sembly.>
9) Remove the camshaft. <Ref. to ME(H4SO 2.0)-
53, 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.
( e )
( a )
11) While tapping the cylinder head with a plastic
hammer, separate it from cylinder block.
12) Remove the bolts (a) and (c) to remove the cyl-
inder head.
( e )
( a )
13) Remove the cylinder head gasket.
Cylinder Head
( c )
( b )
( f )
( d )
ME-00278
( c )
( b )
( f )
( d )
ME-00278
ME(H4SO 2.0)-57
CAUTION:
Be careful not to scratch the mating surface of
cylinder head and cylinder block.
14) Similarly, remove the right side cylinder head.
B: INSTALLATION
1) Install the cylinder head and gaskets on cylinder
block.
CAUTION:
• Use new cylinder head gaskets.
• Be careful not to scratch the mating surface
of cylinder block and cylinder head.
2) Tighten the cylinder head bolts.
(1) Apply a coat of engine oil to washers and
bolt threads.
(2) Tighten all bolts to 29 N!m (3.0 kgf-m, 22 ft-
lb) in alphabetical sequence.
Then tighten all bolts to 69 N!m (7.0 kgf-m, 51 ft-
lb) in alphabetical sequence.
(3) Back off all bolts by 180# in reverse order of
installation, and back them off again by 180#.
(4) Tighten all bolts to 42 N!m (3.9 kgf-m, 31 ft-
lb) in alphabetical sequence.
(5) Tighten all bolts by 80# — 90# in alphabeti-
cal sequence.
(6) Tighten all bolts by 40# — 45# in alphabeti-
cal sequence.
NOTE:
Do not tighten the bolts more than 45#.
(7) Further tighten bolts (a) and (b) by 40#—
45#.
NOTE:
Ensure the total "re-tightening angle" in the [former
two steps], do not exceed 90#.
( a )
( c )
3) Install the camshaft. <Ref. to ME(H4SO 2.0)-54,
INSTALLATION, Camshaft.>
4) Install the valve rocker assembly. <Ref. to
ME(H4SO 2.0)-51, INSTALLATION, Valve Rocker
Assembly.>
5) Install the A/C compressor bracket on cylinder
head.
6) Install the intake manifold.
<Ref. to FU(H4SO 2.0)-12, INSTALLATION, Intake
Manifold.>
MECHANICAL
( f )
( d )
( b )
( e )
ME-00279