Subaru Legacy IV (2008 year). Service manual — part 51
IN(H4SO)-9
Resonator Chamber
INTAKE (INDUCTION)
6. Resonator Chamber
A: REMOVAL
The resonator chamber and air cleaner case are in-
tegrated into one unit; therefore, refer to “Air Clean-
er Case” for removal procedure. <Ref. to
IN(H4SO)-5, REMOVAL, Air Cleaner Case.>
B: INSTALLATION
The resonator chamber and air cleaner case are in-
tegrated into one unit; therefore, refer to “Air Clean-
er Case” for installation procedure. <Ref. to
IN(H4SO)-6, INSTALLATION, Air Cleaner Case.>
C: INSPECTION
Check for cracks or loose connections.
IN(H4SO)-10
Resonator Chamber
INTAKE (INDUCTION)
ME(H4SO)-2
General Description
MECHANICAL
1. General Description
A: SPECIFICATION
Engine
Model
2.5 L
Cylinder arrangement
Horizontally opposed, liquid cooled, 4-cylinder,
4-stroke gasoline engine
Valve system mechanism
Belt driven
Single overhead camshaft
4 valve/cylinder
Bore × Stroke
mm (in)
99.5 × 79.0 (3.917 × 3.110)
Displacement
cm
3
(cu in)
2,457 (150)
Compression ratio
10.0
Compression pressure
(at 200 — 300 rpm)
kPa (kg/cm
2
, psi)
1,020 — 1,275 (10.4 — 13.0, 148 — 185)
Number of piston rings
Pressure ring: 2, Oil ring: 1
Intake valve timing
Constant
Open
BTDC 0°
Close
ABDC 58°
Low speed
Open
BTDC 0°
Close
ABDC –10°
High speed
Open
BTDC 14°
Close
ABDC 62°
Exhaust valve timing
Open
BBDC 30°
Close
ATDC 14°
Valve clearance
mm (in)
Intake
0.20
r0.04 (0.0079r0.0016)
Exhaust
0.25
r0.04 (0.0098r0.0016)
Idling speed [at neutral position on MT,
or “P” or “N” position on AT]
rpm
MT
650
r100 (No load)
850
r100 (A/C ON)
AT
700
r100 (No load)
850
r100 (A/C ON)
Ignition order
1
o 3 o 2 o 4
Ignition timing
BTDC/rpm
MT
10°
r8°/650
AT
15°
r10°/700
ME(H4SO)-3
General Description
MECHANICAL
NOTE:
US: Undersize OS: Oversize
Belt tension
adjuster
Protrusion of adjuster rod
mm (in)
5.2 — 6.2 (0.205 — 0.244)
Valve rocker
arm
Clearance between shaft and arm
mm (in) Standard
0.020 — 0.054 (0.0008 — 0.0021)
Camshaft
Bending limit
mm (in)
0.025 (0.00098) or less
Thrust clearance
mm (in) Standard
0.030 — 0.090 (0.0012 — 0.0035)
Cam lobe height
mm (in)
Intake
Constant
Standard
40.075 — 40.175 (1.5778 — 1.5817)
Low speed
Standard
35.496 — 35.596 (1.3975 — 1.4014)
High speed
Standard
40.315 — 40.415 (1.5872 — 1.5911)
Exhaust
Standard
39.289 — 39.389 (1.5468 — 1.5507)
Camshaft journal O.D.
mm (in)
31.928 — 31.945 (1.2570 — 1.2577)
Camshaft journal hole I.D.
mm (in)
32.000 — 32.018 (1.2598 — 1.2605)
Oil clearance
mm (in) Standard
0.055 — 0.090 (0.0022 — 0.0035)
Cylinder
head
Surface warping limit
(Mating surface with cylinder block)
mm (in)
0.035 (0.0014)
Grinding limit
mm (in)
0.1 (0.004)
Standard height
mm (in)
97.5 (3.84)
Valve seat
Seating angle
90°
Contacting width
mm (in)
Intake
Standard
0.8 — 1.4 (0.03 — 0.055)
Exhaust
Standard
1.2 — 1.8 (0.047 — 0.071)
Valve guide
Inside diameter
mm (in)
6.000 — 6.012 (0.2362 — 0.2367)
Protrusion above head
mm (in)
Intake
20.0 — 21.0 (0.787 — 0.827)
Exhaust
16.5 — 17.5 (0.650 — 0.689)
Valve
Head edge thickness
mm (in)
Intake
Standard
0.8 — 1.2 (0.03 — 0.047)
Exhaust
Standard
1.0 — 1.4 (0.039 — 0.055)
Stem outer diameter
mm (in)
Intake
5.950 — 5.965 (0.2343 — 0.2348)
Exhaust
5.945 — 5.960 (0.2341 — 0.2346)
Valve stem gap
mm (in) Standard
Intake
0.035 — 0.062 (0.0014 — 0.0024)
Exhaust
0.040 — 0.067 (0.0016 — 0.0026)
Overall length
mm (in)
Intake
120.6 (4.75)
Exhaust
121.7 (4.79)
Valve spring
Free length
mm (in)
55.2 (2.173)
Squareness
2.5°, 2.4 (0.094) or less
Tension/spring height
N (kgf, lb)/mm (in)
Set
235.3 — 270.7 (24 — 27.6, 52.9 — 60.8)
/45.0 (1.772)
Lift
578.9 — 639.9 (59.1 — 65.3, 130.3 — 143.9)
/34.7 (1.366)
Cylinder
block
Surface warping limit (mating with cylinder head)
mm (in)
0.025 (0.00098)
Grinding limit
mm (in)
0.1 (0.004)
Standard height
mm (in)
201.0 (7.91)
Cylinder inner diameter
mm (in) Standard
A
99.505 — 99.515 (3.9175 — 3.9179)
B
99.495 — 99.505 (3.9171 — 3.9175)
Taper
mm (in) Standard
0.015 (0.0006)
Out-of-roundness
mm (in) Standard
0.010 (0.0004)
Piston clearance
mm (in) Standard
–0.010 — 0.010 (–0.00039 — 0.00039)
Cylinder inner diameter boring limit (diameter)
mm (in)
To 100.005 (3.9372)
Piston
Outer diameter
mm (in)
Standard
A
99.505 — 99.515 (3.9175 — 3.9179)
B
99.495 — 99.505 (3.9171 — 3.9175)
0.25 (0.0098) OS
99.745 — 99.765 (3.9270 — 3.9277)
0.50 (0.0197) OS
99.995 — 100.015 (3.9368 — 3.9376)
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