Subaru Impreza 2003, Service Manual

Page: 1055 / 3610

ME(H4DOTC)-81
MECHANICAL
CYLINDER HEAD ASSEMBLY
19.Cylinder Head Assembly
A: REMOVAL
1) Remove the V-belt. <Ref. to ME(H4DOTC)-55,
REMOVAL, V-belt.>
2) Remove the crankshaft pulley. <Ref. to
ME(H4DOTC)-58, REMOVAL, Crankshaft Pulley.>
3) Remove the timing belt cover. <Ref. to
ME(H4DOTC)-59, REMOVAL, Timing Belt Cover.>
4) Remove the timing belt assembly. <Ref. to
ME(H4DOTC)-60, REMOVAL, Timing Belt Assem-
bly.>
5) Remove the camshaft sprocket. <Ref. to
ME(H4DOTC)-69, REMOVAL, Camshaft Sprock-
et.>
6) Remove the intake manifold. <Ref. to
FU(H4DOTC)-14, REMOVAL, Intake Manifold.>
7) Remove the bolt which installs the A/C compres-
sor bracket on cylinder head.
8) Remove the camshaft. <Ref. to ME(H4DOTC)-
72, 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.
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.
11) Remove the cylinder head gasket.
NOTE:
Do not scratch the mating surface of cylinder head
and cylinder block.
12) Similarly, remove the cylinder head (RH).
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
°
.
3) Install the camshaft. <Ref. to ME(H4DOTC)-74,
INSTALLATION, Camshaft.>
4) Install the A/C compressor bracket on cylinder
head.
5) Install the intake manifold. <Ref. to
FU(H4DOTC)-17, INSTALLATION, Intake Mani-
fold.>
6) Install the camshaft sprocket. <Ref. to
ME(H4DOTC)-70, INSTALLATION, Camshaft
Sprocket.>
7) Install the timing belt assembly. <Ref. to
ME(H4DOTC)-62, INSTALLATION, Timing Belt
Assembly.>
ME-00122
(B) (C)
(D)
(E)
(F)
(A)
ME-00122
(B)
(C)
(D)
(E)
(F)
(A)
ME-00123
(B)
(C)
(D) (E)
(F) (A)