Subaru Legacy IV (2008 year). Manual - part 483

ME(H6DO)-58

Camshaft

MECHANICAL

(6) Measure the widest point of the plastigauge
on each journal. If oil clearance exceeds the
standard, replace the camshaft. If necessary,
replace the camshaft caps and cylinder head as
a set.

Standard:

0.037 — 0.072 mm (0.0015 — 0.0028 in)

(7) Completely remove the plastigauge.

6) Check the cam face condition; remove the minor
faults by grinding with oil stone. Measure the cam
height H. If it exceeds the standard or offset wear
occurs, replace it.

Cam height H:

Standard

Intake

HIGH 42.09 — 42.19 mm (1.6571 — 1.6610 in)
LOW1 38.14 — 38.24 mm (1.5016 — 1.5055 in)
LOW2 38.14 — 38.24 mm (1.5016 — 1.5055 in)

Exhaust

40.45 — 40.55 mm (1.5925 — 1.5965 in)

Cam base circle diameter A:

Standard

Intake

HIGH 32.00 mm (1.2598 in)
LOW1 31.84 mm (1.2535 in)
LOW2 31.84 mm (1.2535 in)

Exhaust

32.00 mm (1.2598 in)

7) Measure the side clearance of the camshaft with
a dial gauge. If the side clearance exceeds the
standard or there is offset wear, replace the cam-
shaft caps and cylinder head as a set. If necessary
replace the camshaft.

Standard

Intake

0.075 — 0.135 mm (0.0030 — 0.0053 in)

Exhaust

0.030 — 0.090 mm (0.0012 — 0.0035 in)

ME-00119

ME-00120

H

A

ME(H6DO)-59

Cylinder Head

MECHANICAL

20.Cylinder Head

A: REMOVAL

NOTE:
When replacing the single part, perform the work
with the engine installed to body. Refer to “Valve
Clearance” for preparation procedures. <Ref. to
ME(H6DO)-28, Valve Clearance.>
1) Remove the V-belts. <Ref. to ME(H6DO)-42,
REMOVAL, V-belt.>
2) Remove the crank pulley. <Ref. to ME(H6DO)-
43, REMOVAL, Crank Pulley.>
3) Remove the front chain cover. <Ref. to
ME(H6DO)-44, REMOVAL, Front Chain Cover.>
4) Remove the timing chain assembly. <Ref. to
ME(H6DO)-46, REMOVAL, Timing Chain Assem-
bly.>
5) Remove the cam sprocket. <Ref. to ME(H6DO)-
51, REMOVAL, Cam Sprocket.>
6) Remove the crank sprocket. <Ref. to
ME(H6DO)-52, REMOVAL, Crank Sprocket.>
7) Remove the rear chain cover. <Ref. to
ME(H6DO)-53, REMOVAL, Rear Chain Cover.>
8) Remove the camshaft. <Ref. to ME(H6DO)-55,
REMOVAL, Camshaft.>
9) Remove the cylinder head bolts in the numerical
order as shown in the figure.
Leave bolts (2) and (4) 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.
11) Remove the bolts (2) and (4) to remove cylin-
der head.

12) Remove the cylinder head gasket.

CAUTION:
Be careful not to scratch the mating surface of
cylinder head and cylinder block.
13) 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
cylinder head and cylinder block.

NOTE:
Use new cylinder head gaskets.
2) Tighten the cylinder head bolts.

(1) Apply a thin coat of engine oil to washers
and cylinder head bolt threads.
(2) Mount the cylinder head onto the cylinder
block, then tighten the bolts with a torque of 20
N·m (2.0 kgf-m, 14.8 ft-lb) in the order indicated
in the figure.
(3) Tighten the bolts with a torque of 50 N·m
(5.1 kgf-m, 36.9 ft-lb) in the order indicated in
the figure.
(4) Loosen all the bolts by 180° in the reverse
order of installing, and loosen them further by
180°.
(5) Tighten the bolts with a torque of 20 N·m
(2.0 kgf-m, 14.8 ft-lb) in the order indicated in
the figure.
(6) Tighten the bolts (1) — (4) in the order indi-
cated with a torque of 48 N·m (4.9 kgf-m, 35.4
ft-lb).
(7) Tighten the bolts (5) — (8) in the order indi-
cated with a torque of 44 N·m (4.5 kgf-m, 32.5
ft-lb).
(8) Tighten all bolts 90° in the numerical order
as shown in the figure.
(9) Tighten the bolt (1) — (4) by 45° in the nu-
merical order.

3) Install the camshaft. <Ref. to ME(H6DO)-56, IN-
STALLATION, Camshaft.>
4) Install the rear chain cover. <Ref. to ME(H6DO)-
53, INSTALLATION, Rear Chain Cover.>

(2)

(8)

(6)

(5)

(7)

(4)

(1)

(3)

ME-02063

(2)

(8)

(6)

(5)

(7)

(4)

(1)

(3)

ME-02063

(7)

(1)

(3)

(4)

(2)

(5)

(8)

(6)

ME-02064

ME(H6DO)-60

Cylinder Head

MECHANICAL

5) Install the crank sprocket. <Ref. to ME(H6DO)-
52, INSTALLATION, Crank Sprocket.>
6) Install the cam sprocket. <Ref. to ME(H6DO)-51,
INSTALLATION, Cam Sprocket.>
7) Install the timing chain assembly. <Ref. to
ME(H6DO)-47, INSTALLATION, Timing Chain As-
sembly.>
8) Install the front chain cover. <Ref. to ME(H6DO)-
44, INSTALLATION, Front Chain Cover.>
9) Install the crank pulley. <Ref. to ME(H6DO)-43,
INSTALLATION, Crank Pulley.>
10) Install the V-belts. <Ref. to ME(H6DO)-42, IN-
STALLATION, V-belt.>

C: DISASSEMBLY

1) Set the cylinder head on ST.
ST

18250AA010

CYLINDER HEAD TABLE

2) Remove the valve lifter.
3) Set the ST on valve spring retainer. Compress
the valve spring and remove the valve spring re-
tainer key. Remove each valve and valve spring.
ST

499718000

VALVE SPRING REMOVER

NOTE:
• Mark each valve to prevent confusion.
• Pay careful attention not to damage the lips of in-
take valve oil seals and exhaust valve oil seals.
• Keep all the removed parts in order for re-install-
ing in their original positions.
• For removal and installation procedures of the
valve guide, intake valve oil seal and exhaust valve
oil seal, refer to “Inspection”. <Ref. to ME(H6DO)-
61, VALVE GUIDE, INSPECTION, Cylinder
Head.> <Ref. to ME(H6DO)-63, INTAKE AND EX-
HAUST VALVE OIL SEAL, INSPECTION, Cylinder
Head.>

D: ASSEMBLY

1) Installation of valve spring and valve:

(1) Set the cylinder head on ST.

ST

18250AA010

CYLINDER HEAD TABLE

(2) Coat the stem of each valve with engine oil
and insert the valve into the valve guide.

NOTE:
When inserting the valve into valve guide, use spe-
cial care not to damage the oil seal lip.

(3) Install the valve spring and retainer.

NOTE:
• Be sure to install the valve spring with its close-
coiled end facing the seat on cylinder head.
• For the valve spring on intake side, install two of
them (inner and outer).
• Install the valve spring with the painted side fac-
ing to retainer.

(4) Set the ST on valve spring.

ST

499718000

VALVE SPRING REMOVER

(5) Compress the valve spring and fit the valve
spring retainer key.
(6) After installing, tap the valve spring retainers
lightly with a plastic hammer for better seating.

2) Apply oil to the surface of valve lifter and valve
shim.
3) Install the valve lifter and valve shim.

ME-03106

ST

(1) Valve spring seat

(2) Valve spring

(3) Retainer

(4) Painted face

ME-03107

(1)

(2)

(3)

(4)

ME-03106

ST

ME(H6DO)-61

Cylinder Head

MECHANICAL

E: INSPECTION

1. CYLINDER HEAD

1) Check for cracks or damage. Use liquid pene-
trant tester on the important sections to check for
fissures. Check that there are no marks of gas leak-
ing or water leaking on gasket installing surface.
2) Set the cylinder head on ST.
ST

18250AA010

CYLINDER HEAD TABLE

3) Inspect the cylinder head surface that mates
with cylinder block for warping by using a straight
edge (A) and thickness gauge (B). If the warping
exceeds the limit, replace the cylinder head.

Warping limit:

0.02 mm (0.0008 in)

Standard height of cylinder head:

124

r

0.05 mm (4.88

r

0.0020 in)

NOTE:
Uneven torque for the cylinder head bolts can
cause warping. When reinstalling, pay special at-
tention to the torque so as to tighten evenly.

2. VALVE SEAT

Inspect the intake and exhaust valve seats. Correct
the contact surfaces with a valve seat cutter if they
are defective or when valve guides are replaced.

Valve seat width W:

Standard

Intake

1.0 mm (0.039 in)

Exhaust

1.5 mm (0.059 in)

3. VALVE GUIDE

1) Check the clearance between valve guide and
stem. The clearance can be checked by measuring
the valve stem outer diameter with a micrometer
and valve guide inner diameter with a caliper gauge
respectively.

Clearance between the valve guide and valve 
stem:

Standard

Intake

0.030 — 0.057 mm (0.0012 — 0.0022 in)

Exhaust

0.040 — 0.067 mm (0.0016 — 0.0026 in)

2) If the clearance between valve guide and stem
exceeds the standard, replace the valve guide or
valve itself whichever shows greater amount of
wear or damaged and etc. See the following proce-
dure for valve guide replacement.

Valve guide inner diameter:

5.500 — 5.512 mm (0.2165 — 0.2170 in)

Valve stem outer diameters:

Intake

5.455 — 5.470 mm (0.2148 — 0.2154 in)

Exhaust

5.445 — 5.460 mm (0.2144 — 0.2150 in)

(1) Place the cylinder head on ST1 with the
combustion chamber upward so that valve
guides fit the holes in ST1.
(2) Insert the ST2 into valve guide and press it
down to remove the valve guide.

ST1

18250AA010 CYLINDER HEAD TABLE

ST2

499765700

VALVE GUIDE REMOVER

(A)

(B)

ME-00551

ME-00127

W

ME-00553