Cylinder Head Assembly - Subaru 2003 LEGACY Service Manual

MECHANICAL

19.Cylinder Head Assembly

A: REMOVAL
1) Remove the V-belt.
<Ref. to ME(H4DOSTC)-42, REMOVAL, V-belt.>
2) Remove the crankshaft pulley.
<Ref. to ME(H4DOSTC)-44, REMOVAL, Crank-
shaft Pulley.>
3) Remove the belt cover.
<Ref. to ME(H4DOSTC)-46, REMOVAL, Belt Cov-
er.>
4) Remove the timing belt assembly.
<Ref. to ME(H4DOSTC)-47, REMOVAL, Timing
Belt Assembly.>
5) Remove the camshaft sprocket.
<Ref. to ME(H4DOSTC)-55, REMOVAL, Camshaft
Sprocket.>
6) Remove the intake manifold.
<Ref. to FU(H4DOSTC)-15, REMOVAL, Intake
Manifold.>
7) Remove the bolt which installs A/C compressor
bracket on cylinder head.
8) Remove the camshaft. <Ref. to ME(H4DOSTC)-
57, REMOVAL, Camshaft.>
9) Remove the cylinder head bolts in alphabetical
sequence shown in the figure.
Leave bolts (A) and (D) engaged by three or four
threads to prevent the cylinder head from falling.
( D )
( B )
10) While tapping the cylinder head with a plastic
hammer, separate it from cylinder block.
Remove the bolts (A) and (D) to remove cylinder
head.
( D )
( B )
CYLINDER HEAD ASSEMBLY
( F ) ( A )
( E ) ( C )
ME-00122
( F ) ( A )
( E ) ( C )
ME-00122
ME(H4DOSTC)-62
11) Remove the cylinder head gasket.
NOTE:
Do not scratch the mating surface of cylinder head
and cylinder block.
12) Similarly, remove the right side cylinder head.
B: INSTALLATION
1) Install the cylinder head and gaskets on cylinder
block.
NOTE:
• Use new cylinder head gaskets.
• Be careful not to scratch the mating surface of
cylinder head and cylinder block.
2) Tighten the cylinder head bolts.
(1) Apply a coat of engine oil to the washers and
bolt threads.
(2) Tighten all bolts to 29 N·m (3.0 kgf-m, 22 ft-
lb) in alphabetical sequence.
(3) Tighten all bolts to 69 N·m (7.0 kgf-m, 51 ft-
lb) in alphabetical sequence again.
(4) Back off all bolts by 180° first; back them off
by 180× again in reverse order of installation.
(5) Tighten all bolts to 39 N·m (4.0 kgf-m, 29 ft-
lb) in alphabetical sequence.
(6) Tighten all bolts 80 to 90° in alphabetical se-
quence.
(7) Tighten all bolts by 40 to 45° in alphabetical
sequence again.
NOTE:
Do not tighten the bolts by more than 45°.
(8) Further tighten all bolts (A) and (B) by 40 to
45°.
NOTE:
Ensure that the total "re-tightening angle" in the
previous two steps do not exceed 90°.
( C )
( E )
3) Install the camshaft.
<Ref. to ME(H4DOSTC)-58, INSTALLATION,
Camshaft.>
4) Install the A/C compressor bracket on cylinder
head.
5) Install the intake manifold.
<Ref. to FU(H4DOSTC)-18, INSTALLATION, In-
take Manifold.>
( A ) ( F )
( B ) ( D )
ME-00123