Subaru IMPREZA GD 2007 Series Manual page 2465

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MECHANICAL
19.Cylinder Head
A: REMOVAL
NOTE:
Perform the work with the engine installed to body
when replacing a single part. Refer to "Valve Clear-
ance" for preparation. <Ref. to ME(H4DOTC)-32,
Valve Clearance.>
1) Remove the V-belts. <Ref. to ME(H4DOTC)-44,
REMOVAL, V-belt.>
2) Remove the crank
ME(H4DOTC)-46, REMOVAL, Crank Pulley.>
3) Remove the timing belt cover. <Ref. to
ME(H4DOTC)-47, REMOVAL, Timing Belt Cover.>
4) Remove the timing belt. <Ref. to ME(H4DOTC)-
48, REMOVAL, Timing Belt.>
5) Remove the cam
ME(H4DOTC)-56, REMOVAL, Cam Sprocket.>
6) Remove the intake
FU(H4DOTC)-17, 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)-
58, REMOVAL, Camshaft.>
9) Remove the cylinder head bolts in alphabetical
order shown in the figure.
Leave the bolts (A) and (D) engaged by three or
four threads to prevent the cylinder head from fall-
ing.
(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
pulley. <Ref. to
sprocket. <Ref. to
manifold. <Ref. to
(F)
(A)
(E)
(C)
ME-00122
(F)
(A)
(E) (C)
ME-00122
ME(H4DOTC)-64
11) Remove the cylinder head gasket.
CAUTION:
Be careful not to scratch the mating surface of
the cylinder head and cylinder block.
12) Similarly, remove the cylinder head (RH).
B: INSTALLATION
1) Install the cylinder head and gaskets on cylinder
block.
CAUTION:
Be careful not to scratch the mating surface of
the cylinder head and cylinder block.
NOTE:
Use a new cylinder head gasket.
2) Tighten the cylinder head bolts.
(1) Apply a thin coat of engine oil to washer and
bolt thread.
(2) Tighten all bolts to 29 N·m (3.0 kgf-m, 22 ft-
lb) in alphabetical order.
(3) Further tighten all bolts to 69 N·m (7.0 kgf-
m, 51 ft-lb) in alphabetical order.
(4) Loosen all the bolts by 180° in reverse order
of installation, and loosen again by 180°.
(5) Tighten all bolts to 49 N·m (5.0 kgf-m, 36 ft-
lb) in alphabetical order.
(6) Tighten all bolts by 80 to 90° in alphabetical
order.
(7) Tighten all bolts by 40 to 45° in alphabetical
order.
CAUTION:
Do not tighten the bolts 45° or more.
(8) Further tighten the bolts (A) and (B) by 40 to
45°.
CAUTION:
Make sure that the total "re-tightening angle" of
the previous steps (7) and (8) does not exceed
90°.
(A)
(C)
(E) (B)
3) Install the camshaft. <Ref. to ME(H4DOTC)-59,
INSTALLATION, Camshaft.>
4) Install the A/C compressor bracket on cylinder
head.
5) Install the intake manifold. <Ref. to FU(H4DOTC)-
20, INSTALLATION, Intake Manifold.>
(F)
(D)
ME-00123