General Description - Subaru 2004 Impreza Service Manual

MECHANICAL

1. General Description

A: SPECIFICATIONS
Model
Type
Valve arrangement
Bore × Stroke
Displacement
Compression ratio
Compression pressure
(at 350 rpm)
Number of piston rings
Intake valve timing
Engine
Exhaust valve timing
Valve clearance
Idling speed
[At neutral position on MT, or
"P" or "N" position on AT]
Firing order
Ignition timing
NOTE:
STD: Standard I.D.: Inner Diameter O.D.: Outer Diameter US: Undersize OS: Oversize
Belt
tensioner Protrusion of adjuster rod
adjuster
Spacer O.D.
Tensioner bush I.D.
Belt
Clearance between spacer and bush
tensioner
Side clearance of spacer
Valve
Clearance between shaft and arm
rocker arm
General Description
mm (in)
3
cm (cu in)
2
kPa (kg/cm , psi)
Opening
Closing
Opening
Closing
Intake mm (in)
Exhaust mm (in)
rpm
BTDC/rpm
STD
Limit
STD
Limit
STD
Limit
ME(H4SO)-2
1.6 L
Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline
Belt driven, single over-head camshaft, 4-valve/cylinder
87.9 × 65.8
92 × 75 (3.62 × 2.95)
(3.46 × 2.591)
1,597 (97.45) 1,994 (121.67)
1,020 — 1,275 (10.4 — 13.0, 148 — 185)
Pressure ring: 2, Oil ring: 1
10° BTDC
46° ABDC 48° ABDC
42° BBDC 48° BBDC
10° ATDC
0.20±0.04 (0.0079±0.0016)
0.25±0.04 (0.0098±0.0016)
With OBD: 650±100 (No load)
850±100 (A/C ON)
Without OBD: 700±100 (No load)
850±100 (A/C ON)
1 → 3 → 2 → 4
With OBD: With OBD:
5°±10°/650 10°±10°/650
Without OBD: Without OBD:
5°±10°/700 10°±10°/700
5.2 — 6.2 mm (0.205 — 0.244 in)
17.955 — 17.975 mm (0.7069 — 0.7077 in)
18.00 — 18.08 mm (0.7087 — 0.7118 in)
0.025 — 0.125 mm (0.0010 — 0.0049 in)
0.175 mm (0.0069 in)
0.20 — 0.55 mm (0.0079 — 0.0217 in)
0.81 mm (0.0319 in)
0.020 — 0.054 mm (0.0008 — 0.0021 in)
0.10 mm (0.0039 in)
2.0 L 2.5 L
engine
99.5 × 79.0
(3.917 × 3.110)
2,457 (150)
10.0
4° BTDC 1° BTDC
51° ABDC
50° BBDC
4° ATDC 6° ATDC
650±100 (No load)
850±100 (A/C ON)
MT: 10°±10°/650
AT: 15°±10°/650