1997 SUBARU LEGACY service

(2) Apply a coat of engine oil to piston pin and insert
piston pin into piston and connecting rod through ser-
vice hole.
G2M0190
(3) Install circlip.
CAUTION:
Use new circlips.
(4) Install service hole plug and gasket.
CAUTION:
Use a new gasket and apply a coat of fluid packing to
it before installation.
Fluid packing:
THREE BOND 1215 or equivalent
70
2-3SERVICE PROCEDURE
7. Cylinder Block

4. PISTON AND PISTON PIN (#3 AND #4)
B2M0129A
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 6.4 (0.65, 4.7)
T2: 69±7 (7.0±0.7, 50.6±5.1)
Turn cylinder block so that #3 and #4 cylinders face
upward. Using the same procedures as used for #1 and #2
cylinders, install pistons and piston pins.
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2-3SERVICE PROCEDURE
7. Cylinder Block

E: INSTALLATION
1. OIL PUMP AND ENGINE COOLANT PUMP
B2M0124B
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 5 (0.5, 3.6)
T2: 6.4 (0.65, 4.7)
T3: 10 (1.0, 7)
T4: 72±3 (7.3±0.3, 52.8±2.2)
T5: First 12±2 (1.2±0.2, 8.7±1.4)
Second 12±2 (1.2±0.2, 8.7±1.4)
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2-3SERVICE PROCEDURE
7. Cylinder Block

G2M0084
1) Install baffle plate.
2) Install oil strainer and O-ring
3) Install oil strainer stay.
4) Apply fluid packing to matching surfaces and install oil
pan.
Fluid packing:
THREE BOND 1207C or equivalent
G2M0194
5) Apply fluid packing to matching surfaces and install oil
separator cover.
Fluid packing:
THREE BOND 1215 or equivalent
G2M0161
6) Install flywheel or drive plate.
To lock crankshaft, use ST.
ST 498497100 CRANKSHAFT STOPPER
7) Install housing cover.
G2M0076
8) Installation of oil pump
(1) Discard front oil seal after removal. Replace with a
new one by using ST.
ST 499587100 OIL SEAL INSTALLER
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2-3SERVICE PROCEDURE
7. Cylinder Block

B2M0390A
(2) Apply fluid packing to matching surface of oil pump.
Fluid packing:
THREE BOND 1215 or equivalent
(3) Install oil pump on cylinder block. Be careful not to
damage oil seal during installation.
CAUTION:
Do not forget to install O-ring and seal when install-
ing oil pump.
Align flat surface of oil pump’s inner rotor with
crankshaft before installation.
G2M0628
9) Install engine coolant pump and gasket.
CAUTION:
Be sure to use a new gasket.
When installing engine coolant pump, tighten bolts
in two stages in numerical sequence as shown in Fig-
ure.
10) Install engine coolant pipe.
11) Install oil filter.
2. RELATED PARTS
1) Install cylinder head and intake manifold.

2) Install timing belt, camshaft sprocket and related parts.

74
2-3SERVICE PROCEDURE
7. Cylinder Block

1. Engine
A: SPECIFICATIONS
EngineModel2500 cc
TypeHorizontally opposed, liquid cooled, 4-cylinder, 4-stroke
gasoline engine
Valve arrangement Belt driven, double over-head camshaft, 4-valve/cylinder
Bore x Stroke mm (in) 99.5 x 79.0 (3.917 x 3.110)
Displacement cm
3(cu in) 2,457 (149.93)
Compression ratio9.5
Compression pressure
(at 200 — 300 rpm)
kPa (kg/cm
2, psi) rpmStandard 1,216 (12.4, 176) 350
Limit 941 (9.6, 137) 350
Number of piston rings Pressure ring: 2, Oil ring: 1
Intake valve timingOpening 6° BTDC
Closing 50° ABDC
Exhaust valve timingOpening Front: 54° BBDC, Rear: 30° BBDC (Position in degrees)
Closing Front: 10° ATDC, Rear: 10° ATDC (Position in degrees)
Valve clearanceIntake mm (in) 0.20±0.02 (0.0079±0.0008)
Exhaust mm (in) 0.25±0.02 (0.0098±0.0008)
Idling speed
[At neutral position on MT, or
“P” or “N” position on AT] rpm700±100 (No load)
850±50 (A/C switch ON)
Firing order1,3,2,4
Ignition timing BTDC/rpm 15°±8°/700 rpm
2
2-3bSPECIFICATIONS AND SERVICE DATA
1. Engine

B: SERVICE DATA
Belt
tension
adjusterProtrusion of adjuster rod 15.4—16.4 mm (0.606—0.646 in)
Belt ten-
sionerSpacer O.D. 16 mm (0.63 in)
Tensioner bush I.D. 16.16 mm (0.6362 in)
Clearance between spacer and bushSTD 0.117—0.180 mm (0.0046—0.0071 in)
Limit 0.230 mm (0.0091 in)
Side clearance of spacerSTD 0.37—0.54 mm (0.0146—0.0213 in)
Limit 0.8 mm (0.031 in)
CamshaftBend limit 0.020 mm (0.0008 in)
Thrust clearanceSTD 0.040—0.080 mm (0.0016—0.0031 in)
Limit 0.10 mm (0.0039 in)
Cam lobe heightIntakeSTD 42.20—42.30 mm (1.6614—1.6654 in)
Limit 42.04 mm (1.6551 in)
ExhaustSTDFront: 42.50—42.60 mm
Rear: 41.40—41.50 mm(1.6732—1.6772 in)
(1.6299—1.6339 in)
LimitFront: 42.34 mm
Rear: 41.24 mm(1.6669 in)
(1.6236 in)
Camshaft journal O.D.Front 31.946—31.963 mm (1.2577—1.2584 in)
Center 27.946—27.963 mm (1.1002—1.1009 in)
Rear 27.946—27.963 mm (1.1002—1.1009 in)
Camshaft journal hole I.D.Front 32.000—32.018 mm (1.2598—1.2605 in)
Center 28.000—28.018 mm (1.1024—1.1031 in)
Rear 28.000—28.018 mm (1.1024—1.1031 in)
Oil clearanceSTD 0.037—0.072 mm (0.0015—0.0028 in)
Limit 0.10 mm (0.0039 in)
Cylinder
headSurface warpage limit 0.05 mm (0.0020 in)
Surface grinding limit 0.3 mm (0.012 in)
Standard height 127.5 mm (5.02 in)
Valve seatRefacing angle 90°
Contacting widthIntakeSTD 1.0 mm (0.039 in)
Limit 1.7 mm (0.067 in)
ExhaustSTD 1.5 mm (0.059 in)
Limit 2.2 mm (0.087 in)
Valve
guideInner diameter 6.000—6.015 mm (0.2362—0.2368 in)
Protrusion above head 12.0—12.4 mm (0.472—0.488 in)
ValveHead edge thicknessIntakeSTD 1.2 mm (0.047 in)
Limit 0.8 mm (0.031 in)
ExhaustSTD 1.5 mm (0.059 in)
Limit 0.8 mm (0.031 in)
Stem diameterIntake 5.950—5.965 mm (0.2343—0.2348 in)
Exhaust 5.950—5.965 mm (0.2343—0.2348 in)
Stem oil clearanceSTDIntake 0.035—0.062 mm (0.0014—0.0024 in)
Exhaust 0.040—0.067 mm (0.0016—0.0026 in)
Limit—0.15 mm (0.0059 in)
Overall lengthIntake 105.9 mm (4.169 in)
Exhaust 106.2 mm (4.181 in)
STD: Standard I.D.: Inner Diameter O.D.: Outer Diameter
3
2-3bSPECIFICATIONS AND SERVICE DATA
1. Engine

Valve springFree length 48.04 mm (1.8913 in)
Squareness 2.5°, 2.1 mm (0.083 in)
Tension/spring height146.1—167.7 N
(14.9—17.1 kg, 32.9—37.7 lb)/42.0 mm (1.654 in)
455.0—523.7 N
(46.4—53.4 kg, 102.3—117.7 lb)/33.4 mm (1.315 in)
Cylinder
blockSurface warpage limit (mating with cylinder head) 0.05 mm (0.0020 in)
Surface grinding limit 0.1 mm (0.004 in)
Cylinder bore STDA 99.505—99.515 mm (3.9175—3.9179 in)
B 99.495—99.505 mm (3.9171—3.9175 in)
TaperSTD 0.015 mm (0.0006 in)
Limit 0.050 mm (0.0020 in)
Out-of-roundnessSTD 0.010 mm (0.0004 in)
Limit 0.050 mm (0.0020 in)
Piston clearanceSTD 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 diameterSTDA 99.485—99.495 mm (3.9167—3.9171 in)
B 99.475—99.485 mm (3.9163—3.9167 in)
0.25 mm (0.0098 in)
OS99.725—99.735 mm (3.9262—3.9266 in)
0.50 mm (0.0197 in)
OS99.975—99.985 mm (3.9360—3.9364 in)
Piston pinStandard clearance between piston
pin and hole in pistonSTD 0.004—0.010 mm (0.0002—0.0004 in)
Limit 0.020 mm (0.0008 in)
Degree of fitPiston pin must be fitted into position with thumb at 20°C
(68°F).
Piston ringPiston ring gapTop ringSTD 0.20—0.35 mm (0.0079—0.0138 in)
Limit 1.0 mm (0.039 in)
Second
ringSTD 0.37—0.52 mm (0.0146—0.0205 in)
Limit 1.0 mm (0.039 in)
Oil ringSTD 0.20—0.60 mm (0.0079—0.0236 in)
Limit 1.5 mm (0.059 in)
Clearance between piston
ring and piston ring grooveTop ringSTD 0.040—0.080mm (0.0016—0.0031 in)
Limit 0.15 mm (0.0059 in)
Second
ringSTD 0.030—0.070 mm (0.0012—0.0028 in)
Limit 0.15 mm (0.0059 in)
Connecting
rodBend twist per 100 mm (3.94 in) in
lengthLimit 0.10 mm (0.0039 in)
Side clearanceSTD 0.070—0.330 mm (0.0028—0.0130 in)
Limit 0.4 mm (0.016 in)
Connecting
rod bearingOil clearanceSTD 0.010—0.038 mm (0.0004—0.0015 in)
Limit 0.05 mm (0.0020 in)
Thickness at center portionSTD 1.492—1.501 mm (0.0587—0.0591 in)
0.03 mm
(0.0012 in)
US1.510—1.513 mm (0.0594—0.0596 in)
0.05 mm
(0.0020 in)
US1.520—1.523 mm (0.0598—0.0600 in)
0.25 mm
(0.0098 in)
US1.620—1.623 mm (0.0638—0.0639 in)
Connecting
rod bushingClearance between piston pin and
bushingSTD 0—0.022 mm (0—0.0009 in)
Limit 0.030 mm (0.0012 in)
STD: Standard OS: Oversize US: Undersize
4
2-3bSPECIFICATIONS AND SERVICE DATA
1. Engine