Subaru Legacy III (2000-2003 year). Service manual — part 253
IN(H6DO)-8
INTAKE (INDUCTION)
RESONATOR CHAMBER
5. Resonator Chamber
A: REMOVAL
1) Set vehicle on a lift.
2) Remove air intake duct. <Ref. to IN(H6DO)-7,
REMOVAL, Air Intake Duct.>
3) Remove air cleaner lower case. <Ref. to
IN(H6DO)-5, REMOVAL, Air Cleaner.>
4) Remove the resonator chamber mounting bolt
on the right of engine compartment.
5) Remove the front right tire, and lift the vehicle.
6) Remove front mudguard RH.
7) Remove the resonator chamber (A) from the in-
side front fender.
B: INSTALLATION
Install in the reverse order of removal.
C: INSPECTION
Inspect for cracks and loose connections. Check
that no foreign objects are mixed in the resonator
chamber.
IN-00072
IN-00073
( A )
MECHANICAL
ME(H6DO)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Compression . . . . . . . . . . . . . . . . . . . . . . . .19
Idle Speed . . . . . . . . . . . . . . . . . . . . . . . . .20
Ignition Timing. . . . . . . . . . . . . . . . . . . . . . ...21
Valve Clearance. . . . . . . . . . . . . . . . . . . . . . 22
V-belt. . . . . . . . . . . . . . . . . . . . . . . . . . .28
Engine Assembly . . . . . . . . . . . . . . . . . . . . . ..29
Engine Mounting . . . . . . . . . . . . . . . . . . . . . ...36
Preparation for Overhaul. . . . . . . . . . . . . . . . . . ...37
Crankshaft Pulley . . . . . . . . . . . . . . . . . . . . . ..38
Front Chain Cover. . . . . . . . . . . . . . . . . . . . . .39
Timing Chain Assembly . . . . . . . . . . . . . . . . . . . 41
Camshaft Sprocket. . . . . . . . . . . . . . . . . . . . . 46
Crankshaft Sprocket. . . . . . . . . . . . . . . . . . . . ..47
Rear Chain Cover . . . . . . . . . . . . . . . . . . . . . .48
Camshaft. . . . . . . . . . . . . . . . . . . . . . . . ...50
Cylinder Head Assembly . . . . . . . . . . . . . . . . . . ...54
Cylinder Block . . . . . . . . . . . . . . . . . . . . . . ...60
Engine Trouble in General . . . . . . . . . . . . . . . . . . 74
Engine Noise. . . . . . . . . . . . . . . . . . . . . . . .79
ME(H6DO)-2
MECHANICAL
GENERAL DESCRIPTION
1. General Description
A: SPECIFICATIONS
NOTE:
STD: Standard
I.D.: Inner Diameter
O.D.: Outer Diameter
US: Undersize
OS: Oversize
Engine
Type
Horizontally opposed, liquid cooled, 6-cylinder, 4-stroke gaso-
line engine
Valve arrangement
Chain driven, double over-head camshaft, 4-valve/cylinder
Bore x Stroke
mm (in)
89.2 x 80 (3.512 x 3.150)
Displacement
cm
3
(cu in)
3,000 (183)
Compression ratio
10.7
Compression pres-
sure (350 rpm and
fully open throttle)
kPa (kg/cm
2
, psi)
1,275 — 1,471 (13.0 — 15.0, 185 — 213)
Number of piston rings
Pressure ring: 2, Oil ring: 1
Intake valve timing
Opening
5
°
BTDC
Closing
55
°
ABDC
Exhaust valve timing
Opening
52
°
BBDC
Closing
0
°
ATDC
Valve clearance
Intake
mm (in)
0.20
+0.04
/
−
0.06
(0.0079
+0.0016
/
−
0.0024
)
Exhaust
mm (in)
0.25
±
0.05 (0.0098
±
0.0020)
Idle speed [At “P” or “N” posi-
tion]
rpm
600
±
50 (No load)
700
±
50 (A/C switch ON)
Firing order
1
→
6
→
3
→
2
→
5
→
4
Ignition timing
BTDC/rpm
10
°±
8
°
/600
Camshaft
Bend limit
0.020 mm (0.0008 in)
Thrust clearance
Intake
STD
0.075 — 0.135 mm (0.0030 — 0.0053 in)
Limit
0.155 mm (0.0061 in)
Exhaust
STD
0.048 — 0.108 mm (0.0019 — 0.0043 in)
Limit
0.130 mm (0.0051 in)
Cam lobe height
Intake
STD
45.75 — 45.85 mm (1.8012 — 1.8051 in)
Limit
45.65 mm (1.7972 in)
Exhaust
STD
45.25 — 45.35 mm (1.7815 — 1.7854 in)
Limit
45.15 mm (1.7776 in)
Camshaft journal O.D.
Front
37.946 — 37.963 mm (1.4939 — 1.4946 in)
Center & Rear
27.946 — 27.963 mm (1.1002 — 1.1009 in)
Camshaft journal hole I.D.
Front
38.000 — 38.018 mm (1.4961 — 1.4968 in)
Center & Rear
28.000 — 28.018 mm (1.1024 — 1.1031 in)
Oil clearance
STD
0.037 — 0.072 mm (0.0015 — 0.0028 in)
Limit
0.10 mm (0.0039 in)
Cylinder head
Surface warpage limit
0.05 mm (0.0020 in)
Surface grinding limit
0.1 mm (0.004 in)
Standard height
124 mm (4.88 in)
Valve seat
Refacing angle
90
°
Contacting width
Intake
STD
1.0 mm (0.039 in)
Limit
1.7 mm (0.067 in)
Exhaust
STD
1.5 mm (0.059 in)
Limit
2.2 mm (0.087 in)
Valve guide
Inner diameter
5.500 — 5.512 mm (0.2165 — 0.2170 in)
Protrusion above head
Intake
12.3 — 12.7 mm (0.484 — 0.500 in)
ME(H6DO)-3
MECHANICAL
GENERAL DESCRIPTION
Valve
Head edge thickness
Intake
STD
1.0 mm (0.039 in)
Limit
0.8 mm (0.315 in)
Exhaust
STD
1.2 mm (0.047 in)
Limit
0.8 mm (0.315 in)
Stem diameter
Intake
5.455 — 5.470 mm (0.2148 — 0.2154 in)
Exhaust
5.455 — 5.460 mm (0.2148 — 0.2150 in)
Stem oil clearance
STD
Intake
0.030 — 0.057 mm (0.0012 — 0.0022 in)
Exhaust
0.040 — 0.067 mm (0.0016 — 0.0026 in)
Limit
—
0.15 mm (0.0059 in)
Overall length
Intake
103.5 mm (4.07 in)
Exhaust
103.2 mm (4.06 in)
Valve spring
Free length
46.79 mm (1.8421 in)
Squareness
2.5
°
, 2.0 mm (0.079 in)
Cylinder block
Surface warpage limit (mating with cylinder head)
0.05 mm (0.0020 in)
Surface grinding limit
0.1 mm (0.004 in)
Cylinder bore
STD
A
89.205 — 89.215 mm (3.5120 — 3.5124 in)
B
89.195 — 89.205 mm (3.5116 — 3.5120 in)
Taper
Limit
0.050 mm (0.0020 in)
Out-of-round-
ness
Limit
0.050 mm (0.0020 in)
Piston clearance
STD
0.010 — 0.030 mm (0.0004 — 0.0012 in)
Limit
0.050 mm (0.0020 in)
Enlarging (boring) limit
0.5 mm (0.020 in)
Piston
Outer diameter
STD
A
89.185 — 89.195 mm (3.5112 — 3.5116 in)
B
89.175 — 89.185 mm (3.5108 — 3.5112 in)
0.25 mm (0.0098 in) OS
89.425 — 89.435 mm (3.5207 — 3.5211 in)
0.50 mm (0.0197 in) OS
89.675 — 89.685 mm (3.5305 — 3.5309 in)
Standard inner diameter of piston pin hole
22.000 — 22.006 mm (0.8661 — 0.8664 in)
Piston pin
Outer diameter
21.994 — 22.000 mm (0.8659 — 0.8661 in)
Standard clearance between piston pin and hole in piston
0.004 — 0.008 mm (0.0002 — 0.0003 in)
Degree of fit
Piston pin must be fitted into position with thumb at
20
°
C (68
°
F).
Piston ring
Piston ring gap
Top ring
STD
0.20 — 0.35 mm (0.0079 — 0.0138 in)
Limit
1.0 mm (0.039 in)
Second ring
STD
0.35 — 0.50 mm (0.0138 — 0.0197 in)
Limit
1.0 mm (0.039 in)
Oil ring
STD
0.20 — 0.60 mm (0.0079 — 0.0236 in)
Limit
1.5 mm (0.059 in)
Clearance
between pis-
ton ring and
piston ring
groove
Top ring
STD
0.040 — 0.080 mm (0.0016 — 0.0031 in)
Limit
0.15 mm (0.0059 in)
Second ring
STD
0.030 — 0.070 mm (0.0012 — 0.0028 in)
Limit
0.15 mm (0.0059 in)
Connecting rod
Bend twist per 100 mm (3.94 in)
in length
Limit
0.10 mm (0.0039 in)
Side clearance
STD
0.070 — 0.330 mm (0.0028 — 0.0130 in)
Limit
0.4 mm (0.016 in)
Connecting rod
bearing
Oil clearance
STD
0.022 — 0.052 mm (0.0009 — 0.0020 in)
Limit
0.065 mm (0.0026 in)
Thickness at center portion
STD
1.490 — 1.502 mm (0.0587 — 0.0591 in)
0.03 mm (0.0012 in) US
1.510 — 1.513 mm (0.0594 — 0.0596 in)
0.05 mm (0.0020 in) US
1.520 — 1.523 mm (0.0598 — 0.0600 in)
0.25 mm (0.0098 in) US
1.620 — 1.623 mm (0.0638 — 0.0639 in)
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