Cylinder Head Assembly - Subaru Legacy 2002 Service Manual

20. Cylinder Head Assembly

A: REMOVAL
S173093A18
1) Remove V-belt. <Ref. to ME-45, REMOVAL,
V-belt.>
2) Remove crankshaft pulley. <Ref. to ME-47,
REMOVAL, Crankshaft Pulley.>
3) Remove belt cover.
REMOVAL, Belt Cover.>
4) Remove timing belt assembly. <Ref. to ME-50,
REMOVAL, Timing Belt Assembly.>
5) Remove camshaft sprocket. <Ref. to ME-55,
REMOVAL, Camshaft Sprocket.>
6) Remove intake manifold. <Ref. to FU-15,
REMOVAL, Intake Manifold.> or <Ref. to FU(w/
oOBD)-13, REMOVAL, Intake Manifold.>
7) Remove bolt which installs A/C compressor
bracket on cylinder head.
8) Remove valve rocker assembly. <Ref. to
ME-58, REMOVAL, Valve Rocker Assembly.>
9) Remove camshaft. <Ref. to ME-60, REMOVAL,
Camshaft.>
10) Remove cylinder head bolts in alphabetical
sequence shown in figure.
CAUTION:
Leave bolts (a) and (c) engaged by three or four
threads to prevent cylinder head from falling.
11) While tapping cylinder head with a plastic
hammer, separate it from cylinder block.
12) Remove bolts (a) and (b) to remove cylinder
head.
13) Remove cylinder head gasket.
CYLINDER HEAD ASSEMBLY
S173093
<Ref. to ME-49,
S2M1589A
S2M1589A
ME-65
CAUTION:
Do not scratch the mating surface of cylinder
head and cylinder block.
14) Similarly, remove right side cylinder head.
B: INSTALLATION
1) Install cylinder head and gaskets on cylinder
block.
CAUTION:
¼ Use new cylinder head gaskets.
¼ Be careful not to scratch the mating surface
of cylinder block and cylinder head.
2) Tighten 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° first; back them off
by 180° again.
(4) Tighten bolts (a) and (b) to 34 N·m (3.5
kgf-m, 25 ft-lb).
(5) Tighten bolts (c), (d), (e) and (f) to 15 N·m
(1.5 kgf-m, 11 ft-lb).
(6) Tighten all bolts by 80 to 90° in alphabetical
sequence.
CAUTION:
Do not tighten bolts more than 90°.
(7) Further tighten all bolts by 80 to 90° in
alphabetical sequence shown in figure below.
CAUTION:
Ensure that the total "re-tightening angle" [in
the former two steps], do not exceed 180°.
3) Install camshaft.
INSTALLATION, Camshaft.>
4) Install valve rocker assembly. <Ref. to ME-58,
INSTALLATION, Valve Rocker Assembly.>
5) Install A/C compressor bracket on cylinder
head.
Mechanical
S173093A11
S2M1589B
<Ref. to ME-61,