Subaru Legacy IV (2008 year). Service manual — part 255
IN(H4DOTC)-17
Air By-pass Valve
INTAKE (INDUCTION)
9. Air By-pass Valve
A: REMOVAL
1) Remove the collector cover.
2) Disconnect the air by-pass pipe (A) and vacuum
hose (B) from the air by-pass valve (C).
3) Remove the air by-pass valve (C) from the inter-
cooler.
B: INSTALLATION
Install in the reverse order of removal.
NOTE:
• Use new O-rings.
• Be careful not to pinch the O-ring.
Tightening torque:
6.5 N·m (0.7 kgf-m, 4.8 ft-lb)
(A) Air by-pass pipe
(B) Vacuum hose
(C) Air by-pass valve
(A)
(B)
(C)
IN-02477
(A)
(B)
(C)
IN-02477
IN(H4DOTC)-18
Air By-pass Valve
INTAKE (INDUCTION)
ME(H4DOTC)-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, double overhead camshaft,
4-valve/cylinder
Bore × Stroke
mm (in)
99.5 × 79.0 (3.92 × 3.11)
Displacement
cm
3
(cu in)
2,457 (149.94)
Compression ratio
8.4
Compression pressure
(at 200 — 300 rpm)
kPa (kg/cm
2
, psi)
981 — 1,177 (10 — 12, 142 — 171)
Number of piston rings
Pressure ring: 2, Oil ring: 1
Intake valve timing
Open
Max. retard
ATDC 5°
Min. advance
BTDC 35°
Close
Max. retard
ABDC 65°
Min. advance
ABDC 25°
Exhaust valve timing
Open
BBDC 55°
Close
ATDC 5°
Valve clearance
mm (in)
Intake
0.20
r0.02 (0.0079r0.0008)
Exhaust
0.35
r0.02 (0.0138r0.0008)
Idling speed [at neutral position on MT,
or “P” or “N” position on AT]
rpm
No load
750
r100
A/C ON
800
r100 (MT model)
825
r100 (AT model)
Ignition order
1
o 3 o 2 o 4
Ignition timing
BTDC/rpm
MT model
12°
r10°/750
AT model
17°
r10°/750
ME(H4DOTC)-3
General Description
MECHANICAL
NOTE:
OS: Oversize
US: Undersize
Belt tension
adjuster
Protrusion of adjuster rod
mm (in)
5.2 — 6.2 (0.205 — 0.244)
Camshaft
Bending limit
mm (in)
0.020 (0.00079) or less
Thrust clearance
mm (in) Standard
0.068 — 0.116 (0.0027 — 0.0047)
Cam lobe height
mm (in)
Intake
Standard
46.55 — 46.65 (1.833 — 1.837)
Exhaust
Standard
46.75 — 46.85 (1.841 — 1.844)
Journal O.D.
mm (in) Standard
Front
37.946 — 37.963 (1.4939 — 1.4946)
Center, rear
29.946 — 29.963 (1.1790 — 1.1796)
Journal clearance
mm (in) Standard
0.037 — 0.072 (0.0015 — 0.0028)
Cylinder
head
Surface warping limit
(Mating surface with cylinder block)
mm (in)
0.035 (0.0014)
Grinding limit
mm (in)
0.3 (0.012)
Standard height
mm (in)
127.5 (5.02)
Valve seat
Seating angle
90°
Contacting width
mm (in)
Intake
Standard
0.6 — 1.4 (0.024 — 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)
15.8 — 16.2 (0.622 — 0.638)
Valve
Head edge thickness
mm (in)
Intake
Standard
1.0 — 1.4 (0.039 — 0.055)
Exhaust
Standard
1.3 — 1.7 (0.051 — 0.067)
Stem outer diameter
mm (in)
Intake
5.955 — 5.970 (0.2344 — 0.2350)
Exhaust
5.945 — 5.960 (0.2341 — 0.2346)
Valve stem gap
mm (in) Standard
Intake
0.030 — 0.057 (0.0012 — 0.0022)
Exhaust
0.040 — 0.067 (0.0016 — 0.0026)
Overall length
mm (in)
Intake
104.4 (4.110)
Exhaust
104.65 (4.1201)
Valve spring
Free length
mm (in)
47.32 (1.863)
Squareness
2.5°, 2.1 mm (0.083 in) or less
Tension/spring height
N (kgf, lb)/mm (in)
Set
205 — 235
(20.9 — 24.0, 46.1 — 52.8)/36.0 (1.417)
Lift
426 — 490
(43.4 — 50.0, 95.8 — 110)/26.5 (1.043)
Valve lifter
Outer diameter
mm (in) Standard
34.959 — 34.975 (1.3763 — 1.3770)
Inner diameter (cylinder head)
mm (in) Standard
34.994 — 35.016 (1.3777 — 1.3786)
Valve lifter clearance
mm (in) Standard
0.019 — 0.057 (0.0007 — 0.0022)
Cylinder
block
Surface warping limit
(Mating surface with cylinder head)
mm (in)
0.025 (0.0098)
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 — 3.9278)
0.50 (0.0197) OS
99.995 — 100.015 (3.9368 — 3.9376)
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