2004 SUBARU FORESTER cylinder head

SPC-2
SPECIFICATION
Forester
1. Forester
A: DIMENSIONS
★: With sunroof
B: ENGINE
Model 2.0 L Non-turbo 2.0 L Turbo 2.5 L Non-turbo 2.5 L Turbo
Overall length mm (in) 4,450 (175.2)
Overall width mm (in) 1,735 (68.3)
Overall height (at C.W.) mm (in) 1,590 (62.6) 1,585 (62.4) 1,590 (62.6)
CompartmentLength mm (in) 1,795 (70.7)
Width mm (in) 1,455 (57.3)
Height mm (in)
1,245 (49.0), 1,210 (47.6)
★
Wheelbase mm (in) 2,525 (99.4)
Tread Front mm (in) 1,495 (58.9)
Rear mm (in) 1,485 (58.5)
Minimum road clearance mm (in) 190 (7.5) 195 (7.7) 200 (7.9)
Model 2.0 L Non-turbo 2.0 L Turbo 2.5 L Non-turbo 2.5 L Turbo
Engine type Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine
Valve arrangement Overhead camshaft type
Bore×Stroke mm (in) 92×75 (3.62×2.95) 99.5×79 (3.92×3.11)
Displacement
cm
3 (cu in)1,994 (121.67) 2,457 (149.94)
Compression ratio 10.0±0.2 8.0±0.2 10.0±0.2 8.2±0.2
Firing order 1 — 3 — 2 — 4
Idle speed at Park or Neu-
tral positionrpm 650±100 700±100 650±100 700±100
Maximum output kW (PS)/rpm 92 (125)/5,600 130 (177)/5,600 115 (156)/5,600 155 (211)/5,600
Maximum torque N⋅m (kgf-m, ft-lb)/rpm184 (18.8, 41.4)/
3,600245 (25.0, 55.1)/
3,200223 (22.7, 50.1)/
3,600320 (32.6, 71.8)/
3,600

PM-10
PERIODIC MAINTENANCE SERVICE
Spark Plugs
5. Spark Plugs
A: REPLACEMENT
1) Remove the intake duct and intake chamber.
2) Remove the washer tank and put it aside.
3) Disconnect the spark plug cord.
4) Remove the spark plug with a plug-wrench.
5) Set the new spark plug.
Spark plug:
Non-turbo model
CHAMPION RC10YC4 (Standard)
NGK BKR5E-11 (Alternate)
2.0 L Turbo model
NGK PFR6G
2.5 L Turbo model
NGK ILFR6B
Spark plug gap:
Non-turbo model
1.0 — 1.1 mm (0.039 — 0.043 in)
Turbo model
0.7 — 0.8 mm (0.028 — 0.031 in)
6) Tighten the spark plug lightly with hand, and
then secure with a plug-wrench to the specified
torque.
Tightening torque:
21
±3 N·m (2.14±0.31 kgf-m, 15.49±2.21 ft-lb)
NOTE:
 Be sure to place the gasket between the cylinder
head and spark plug.
 If a torque wrench is not available, tighten the
spark plug until gasket contacts cylinder head; then
tighten further 1/4 to 1/2 turns.
PM-00001

FU(H4SO)-16
FUEL INJECTION (FUEL SYSTEM)
Intake Manifold
16) Disconnect the connector from the oil pressure
switch.
17) Disconnect the connector from the camshaft
position sensor.
18) Remove the EGR pipe from intake manifold.19) Disconnect the fuel hoses from the fuel pipes.
WARNING:
 Do not spill fuel.
 Catch fuel from hoses in a container or cloth.
20) Remove the bolts which hold intake manifold
onto the cylinder heads.
21) Remove the intake manifold.
B: INSTALLATION
1) Install the intake manifold onto the cylinder
heads.
NOTE:
Replace the gaskets with new ones.
Tightening torque:
25 N
⋅m (2.5 kgf-m, 18.1 ft-lb)
FU-00146
FU-00147
FU-00148
(A) Fuel delivery hose
(B) Fuel return hose
(C) Evaporation hose
(B) (A)
(C)
FU-00259
FU-00260
FU-00260

EC(H4SO)-3
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICE)
Front Catalytic Converter
2. Front Catalytic Converter
A: REMOVAL
1) Set the vehicle on a lift.
2) Disconnect the ground cable from battery.
3) Disconnect the front oxygen (A/F) sensor con-
nector.
4) Disconnect the connector from rear oxygen sen-
sor connector.
5) Lift-up the vehicle.
6) Remove the under cover.7) Separate the center exhaust pipe from rear ex-
haust pipe.
CAUTION:
Be careful, the exhaust pipe is hot.
8) Remove the nuts which hold front exhaust pipe
onto cylinder heads.
9) Remove the front and center exhaust pipe from
hanger bracket.
CAUTION:
Be careful not to pull down the front exhaust
pipe and center exhaust pipe.
FU-00009
EX-00029
EX-00030
EX-00037
EC-00009
EX-00038

EC(H4SO)-4
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICE)
Front Catalytic Converter
10) Separate the front catalytic converter from front
exhaust pipe.
B: INSTALLATION
NOTE:
Replace gaskets with new ones.
1) Install the front catalytic converter to front ex-
haust pipe.
Tightening torque:
30 N
⋅m (3.1 kgf-m, 22.4 ft-lb)
2) Install the front and center exhaust pipe assem-
bly to the vehicle. And temporarily tighten the bolt
which installs center exhaust pipe to hanger brack-
et.3) Tighten the nuts which hold front exhaust pipe
onto cylinder heads.
Tightening torque:
30 N
⋅m (3.1 kgf-m, 22.4 ft-lb)
4) Tighten the bolts which install front and center
exhaust pipe to rear exhaust pipe.
Tightening torque:
18 N
⋅m (1.8 kgf-m, 13.0 ft-lb)
5) Tighten the bolt which holds front and center ex-
haust pipe assembly to hanger bracket.
Tightening torque:
35 N
⋅m (3.6 kgf-m, 26.0 ft-lb)
6) Install the under cover.
EC-00011
EC-00011
EX-00038
EC-00009
EX-00037
EX-00038

MECHANICAL
ME(H4SO)
Page
1. General Description ....................................................................................2
2. Compression .............................................................................................25
3. Idle Speed .................................................................................................26
4. Ignition Timing ...........................................................................................27
5. Intake Manifold Vacuum............................................................................28
6. Engine Oil Pressure ..................................................................................29
7. Fuel Pressure ............................................................................................30
8. Valve Clearance ........................................................................................31
9. Engine Assembly ......................................................................................34
10. Engine Mounting .......................................................................................41
11. Preparation for Overhaul ...........................................................................42
12. V-belt .........................................................................................................43
13. Crank Pulley ..............................................................................................45
14. Timing Belt Cover......................................................................................47
15. Timing Belt ................................................................................................48
16. Cam Sprocket ...........................................................................................53
17. Crank Sprocket .........................................................................................55
18. Valve Rocker Assembly ............................................................................56
19. Camshaft ...................................................................................................58
20. Cylinder Head ...........................................................................................62
21. Cylinder Block ...........................................................................................69
22. Engine Trouble in General ........................................................................91
23. Engine Noise .............................................................................................96

ME(H4SO)-2
MECHANICAL
General Description
1. General Description
A: SPECIFICATION
NOTE:
STD: Standard I.D.: Inner Diameter O.D.: Outer Diameter US: Undersize OS: Oversize
EngineModel 2.0 L 2.5 L
Ty p eHorizontally opposed, liquid cooled, 4-cylinder, 4-stroke gaso-
line engine
Valve arrangement 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 200 — 300 rpm)kPa (kg/cm
2, psi)1,079 — 1,275 (11.0 — 13.0, 156 — 185)
Number of piston rings Pressure ring: 2, Oil ring: 1
Intake valve timingOpen 4° BTDC 1° BTDC
Close 48° ABDC 51° ABDC
Exhaust valve timingOpen 48° BBDC 50° BBDC
Close 4° AT D C 6° AT D C
Valve clearance Intake mm (in) 0.20±0.04 (0.0079±0.0016)
Exhaust mm (in) 0.25±0.04 (0.0098±0.0016)
Idling speed [at neutral position on
MT, or “P” or “N” range on AT]rpm650±100 (No load)
850±100 (A/C switch ON)
Firing order 1 → 3 → 2 → 4
Ignition timing BTDC/rpm 10°±10°/650
Belt
tensioner
adjusterProtrusion of adjuster rod mm (in) 5.7 — 6.7 (0.224 — 0.263)
Belt
tensionerSpacer O.D. mm (in) 17.955 — 17.975 (0.7069 — 0.7077)
Tensioner bush I.D. mm (in) 18.00 — 18.08 (0.7087 — 0.7118)
Clearance between spacer and bush mm (in)STD 0.025 — 0.125 (0.0010 — 0.0049)
Limit 0.175 (0.0069)
Side clearance of spacer mm (in)STD 0.20 — 0.55 (0.0079 — 0.0217)
Limit 0.81 (0.0319)
Valve rocker
armClearance between shaft and arm mm (in)STD 0.020 — 0.054 (0.0008 — 0.0021)
Limit 0.10 (0.0039)
CamshaftBend limit mm (in) 0.025 (0.0010)
Thrust clearance mm (in)STD 0.030 — 0.090 (0.0012 — 0.0035)
Limit 0.10 (0.0039)
Cam lobe height mm (in)2.0 LIntakeSTD 38.732 — 38.832 (1.5249 — 1.5288)
Limit 38.632 (1.5209)
ExhaustSTD 39.259 — 39.359 (1.5456 — 1.5496)
Limit 39.157 (1.5417)
2.5 LIntakeSTD 39.485 — 39.585 (1.5545 — 1.5585)
Limit 39.385 (1.5506)
ExhaustSTD 39.259 — 39.359 (1.5456 — 1.5496)
Limit 39.159 (1.5417)
Camshaft journal O.D. mm (in) 31.928 — 31.945 (1.2570 — 1.2577)
Camshaft journal hole I.D. (Cylinder head) mm (in) 32.000 — 32.018 (1.2598 — 1.2605)
Oil clearance mm (in)STD 0.055 — 0.090 (0.0022 — 0.0035)
Limit 0.10 (0.0039)

ME(H4SO)-3
MECHANICAL
General Description
Cylinder
headSurface warpage limit (mating with cylinder block) mm (in) 0.05 (0.0020)
Grinding limit mm (in) 0.1 (0.004)
Standard height mm (in) 97.5 (3.84)
Va l ve s e a tRefacing angle90°
Contacting width mm (in)IntakeSTD 1.1 (0.043)
Limit 1.8 (0.070)
ExhaustSTD 1.5 (0.059)
Limit 2.2 (0.087)
Valve guideInner diameter mm (in) 6.000 — 6.012 (0.2362 — 0.2367)
Protrusion above head mm (in)Intake 20.0 — 20.5 (0.787 — 0.807)
Exhaust 16.5 — 17.0 (0.650 — 0.669)
Va l veHead edge thickness mm (in)IntakeSTD 1.0 (0.039)
Limit 0.6 (0.024)
ExhaustSTD 1.2 (0.047)
Limit 0.6 (0.024)
Stem outer diameter mm (in)Intake 5.950 — 5.965 (0.2343 — 0.2348)
Exhaust 5.945 — 5.960(0.2341 — 0.2346)
Stem oil clearance mm (in)STDIntake 0.035 — 0.062 (0.0014 — 0.0024)
Exhaust 0.040 — 0.067 (0.0016 — 0.0026)
Limit — 0.15 (0.0059)
Overall length mm (in)Intake 120.6 (4.75)
Exhaust 121.7 (4.79)
Valve springFree length mm (in) 54.30 (2.1378)
Squareness mm (in) 2.5°, 2.4 (0.094)
Tension/spring height N (kgf, lb)/mm (in)Set214 — 246 (22 — 25, 48 — 55)/
45.0 (1.772)
Lift526 — 582 (54 — 59, 119 — 130)/
34.7 (1.366)
Cylinder
blockSurface warpage limit (mating with cylinder head) mm (in) 0.05 (0.0020)
Grinding limit mm (in) 0.1 (0.004)
Cylinder inner
diametermm (in)2.0 L STDA 92.005 — 92.015 (3.6222 — 3.6226)
B 91.995 — 92.005 (3.6218 — 3.6222)
2.5 L STDA 99.505 — 99.515 (3.9175 — 3.9179)
B 99.495 — 99.505 (3.9171 — 3.9175)
Ta p e r m m ( i n )STD 0.015 (0.0006)
Limit 0.050 (0.0020)
Out-of-roundness mm (in)STD 0.010 (0.0004)
Limit 0.050 (0.0020)
Piston clearance mm (in)STD 0.010 — 0.030 (0.0004 — 0.0012)
Limit 0.050 (0.0020)
Boring mm (in) 0.5 (0.020)
PistonOuter diameter mm (in)2.0 LSTDA 91.985 — 91.995 (3.6214 — 3.6218)
B 91.975 — 91.985 (3.6211 — 3.6214)
0.25 (0.0098) OS 92.225 — 92.235 (3.6309 — 3.6313)
0.50 (0.0197) OS 92.475 — 92.485 (3.6407 — 3.6411)
2.5 LSTDA 99.485 — 99.495 (3.9167 — 3.9171)
B 99.475 — 99.485 (3.9163 — 3.9167)
0.25 (0.0098) OS 99.725 — 99.735 (3.9262 — 3.9266)
0.50 (0.0197) OS 99.975 — 99.985 (3.9360 — 3.9364)
Piston pin standard diameter mm (in) 23.000 — 23.006 (0.9055 — 0.9057)