Subaru Legacy (2005 year). Service manual — part 54
IN(H4SO 2.0)-9
INTAKE (INDUCTION)
Resonator Chamber
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
2.0)-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 2.0)-5, INSTALLATION, Air Cleaner
Case.>
C: INSPECTION
Check for cracks or loose connections.
IN(H4SO 2.0)-10
INTAKE (INDUCTION)
Resonator Chamber
MECHANICAL
ME(H4SO 2.0)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Compression . . . . . . . . . . . . . . . . . . . . . . . .22
Idle Speed . . . . . . . . . . . . . . . . . . . . . . . . .23
Ignition Timing. . . . . . . . . . . . . . . . . . . . . . ...24
Intake Manifold Vacuum. . . . . . . . . . . . . . . . . . . 25
Engine Oil Pressure . . . . . . . . . . . . . . . . . . . . ..26
Fuel Pressure. . . . . . . . . . . . . . . . . . . . . . . 27
Valve Clearance. . . . . . . . . . . . . . . . . . . . . . 28
Engine Assembly . . . . . . . . . . . . . . . . . . . . . ..30
Engine Mounting . . . . . . . . . . . . . . . . . . . . . ...35
Preparation for Overhaul. . . . . . . . . . . . . . . . . . ...36
V-belt. . . . . . . . . . . . . . . . . . . . . . . . . . .37
Crank Pulley. . . . . . . . . . . . . . . . . . . . . . . ..40
Timing Belt Cover. . . . . . . . . . . . . . . . . . . . . ..42
Timing Belt . . . . . . . . . . . . . . . . . . . . . . . . 43
Cam Sprocket . . . . . . . . . . . . . . . . . . . . . . ...48
Crank Sprocket . . . . . . . . . . . . . . . . . . . . . . .50
Valve Rocker Assembly . . . . . . . . . . . . . . . . . . . 51
Camshaft. . . . . . . . . . . . . . . . . . . . . . . . ...53
Cylinder Head . . . . . . . . . . . . . . . . . . . . . . ...57
Cylinder Block . . . . . . . . . . . . . . . . . . . . . . ...64
Intake and Exhaust Valve . . . . . . . . . . . . . . . . . . .85
Piston . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Connecting Rod . . . . . . . . . . . . . . . . . . . . . . 87
Crankshaft. . . . . . . . . . . . . . . . . . . . . . . . .88
Engine Trouble in General . . . . . . . . . . . . . . . . . . 89
Engine Noise. . . . . . . . . . . . . . . . . . . . . . . .95
ME(H4SO 2.0)-2
MECHANICAL
General Description
1. General Description
A: SPECIFICATION
NOTE:
US: undersize OS: oversize
Model
2.0 L
2.5 L
Engine
Cylinder arrangement
Horizontally opposed, liquid cooled, 4-cylin-
der,
4-stroke gasoline engine
Valve system mechanism
Belt driven,
single over-head camshaft,
4 valve/cylinder
Bore
× Stroke
mm (in)
92
× 75 (3.62 × 2.95)
99.5
× 79.0
(3.917
× 3.110)
Displacement
cm
3
(cu in)
1,994 (121.67)
2,457 (150)
Compression ratio
10.0
Compression pressure (at 350
rpm)
kPa (kgf/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
Open
BTDC 2
°
BTDC 2
°
Close
ABDC 54
°
ABDC 56
°
Exhaust valve timing
Open
BBDC 39
°
BBDC 50
°
Close
ATDC 5
°
ATDC 8
°
Valve clearance
mm (in)
Intake
0.20
±0.04 (0.0079±0.0016)
Exhaust
0.25
±0.04 (0.0098±0.0016)
Idling speed [at neutral position on MT, or “P” or
“N” range on AT]
rpm
650
±100 (No load)
800
±100 (A/C ON)
Ignition order
1
→ 3 → 2 → 4
Ignition timing
BTDC/rpm
13
°±10°/650
Belt ten-
sion
adjuster
Protrusion of adjuster rod
mm (in)
5.2 — 6.2 (0.205 — 0.244)
Belt ten-
sioner
Spacer O.D.
mm (in)
17.955 — 17.975 (0.7069 — 0.7077)
Tensioner bushing I.D.
mm (in)
18.00 — 18.08 (0.7087 — 0.7118)
Clearance between spacer and bush-
ing
mm (in) Standard
0.025 — 0.125 (0.0010 — 0.0049)
Side clearance of spacer
mm (in) Standard
0.20 — 0.55 (0.0079 — 0.0217)
Valve rocker
arm
Clearance between shaft and arm
mm (in) Standard
0.020 — 0.054 (0.0008 — 0.0021)
Camshaft
Bend limit
mm (in)
0.020 (0.00079)
Thrust clearance
mm (in) Standard
0.030 — 0.090 (0.0012 — 0.0035)
Cam lobe height
mm (in)
2.0 L
Intake
Standard
39.646 — 39.746 (1.5609 — 1.5648)
Exhaust
Standard
39.351 — 39.451 (1.5493 — 1.5532)
2.5 L
Intake
Standard
39.485 — 39.585 (1.5545 — 1.5585)
Exhaust
Standard
39.904 — 40.004 (1.5710 — 1.5750)
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 warpage limit
(mating with cylinder block)
mm (in)
0.03 (0.001)
Grinding limit
mm (in)
0.1 (0.004)
Standard height
mm (in)
97.5 (3.84)
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