1997 SUBARU LEGACY service

G2M0178
2) Measure the crankshaft bend, and correct or replace if
it exceeds the limit.
CAUTION:
If a suitable V-block is not available, install #1 and #5
crankshaft bearing on cylinder block, position crank-
shaft on these bearings and measure crankshaft bend
using a dial gauge.
Crankshaft bend limit:
0.035 mm (0.0014 in)
G2M0179
3) Inspect the crank journal and crank pin for wear. If not
to specifications, replace bearing with an undersize one,
and replace or recondition crankshaft as necessary. When
grinding crank journal or crank pin, finish them to the speci-
fied dimensions according to the undersize bearing to be
used.
Crank pin and crank journal:
Out-of-roundness
0.020 mm (0.0008 in) or less
Taper limit
0.07 mm (0.0028 in)
Grinding limit
0.25 mm (0.0098 in)
Unit: mm (in)
Crank journal diameter
Crank pin diameter
#1, #5 #2, #3, #4
StandardJournal O.D.59.992—60.008
(2.3619—2.3625)59.992—60.008
(2.3619—2.3625)47.984—48.000
(1.8891—1.8898)
Bearing size
(Thickness at
center)1.998—2.011
(0.0787—0.0792)2.000—2.013
(0.0787—0.0793)1.492—1.501
(0.0587—0.0591)
0.03 (0.0012)
undersizeJournal O.D.59.962—59.978
(2.3607—2.3613)59.962—59.978
(2.3607—2.3613)47.954—47.970
(1.8879—1.8886)
Bearing size
(Thickness at
center)2.017—2.020
(0.0794—0.0795)2.019—2.022
(0.0795—0.0796)1.510—1.513
(0.0594—0.0596)
0.05 (0.0020)
undersizeJournal O.D.59.942—59.958
(2.3599—2.3605)59.942—59.958
(2.3599—2.3605)47.934—47.950
(1.8872—1.8878)
Bearing size
(Thickness at
center)2.027—2.030
(0.0798—0.0799)2.029—2.032
(0.0799—0.0800)1.520—1.523
(0.0598—0.0600)
0.25 (0.0098)
undersizeJournal O.D.59.742—59.758
(2.3520—2.3527)59.742—59.758
(2.3520—2.3527)47.734—47.750
(1.8793—1.8799)
Bearing size
(Thickness at
center)2.127—2.130
(0.0837—0.0839)2.129—2.132
(0.0838—0.0839)1.620—1.623
(0.0638—0.0639)
O.D. ... Outer Diameter
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2-3bSERVICE PROCEDURE
5. Cylinder Block

G2M0180
4) Measure the thrust clearance of crankshaft at center
bearing. If the clearance exceeds the limit, replace bearing.
Crankshaft thrust clearance:
Standard
0.030—0.115 mm (0.0012—0.0045 in)
Limit
0.25 mm (0.0098 in)
5) Inspect individual crankshaft bearings for signs of
flaking, seizure, melting, and wear.
6) Measure the oil clearance on each crankshaft bearing
by means of plastigauge. If the measurement is not within
the specification, replace defective bearing with an under-
size one, and replace or recondition crankshaft as neces-
sary.
Unit: mm (in)
Crankshaft oil clearance
Standard#1, #50.003—0.030
(0.0001—0.0012)
#2, #3, #40.010—0.033
(0.0004—0.0013)
Limit#1, #3, #5 0.040 (0.0016)
#2, #4 0.045 (0.0018)
66
2-3bSERVICE PROCEDURE
5. Cylinder Block

D: ASSEMBLY
1. CRANKSHAFT AND PISTON
B2M0127A
Tightening torque: N⋅m (kg-m, ft-lb)
T: 44±2 (4.5±0.2, 32.5±1.4)
1) Install connecting rod bearings on connecting rods and
connecting rod caps.
CAUTION:
Apply oil to the surfaces of the connecting rod bear-
ings.
2) Install connecting rod on crankshaft.
CAUTION:
Position each connecting rod with the side marked
facing forward.
3) Install connecting rod cap with connecting rod nut.
Ensure the arrow on connecting rod cap faces the front
during installation.
CAUTION:
Each connecting rod has its own mating cap. Make
sure that they are assembled correctly by checking
their matching number.
When tightening the connecting rod nuts, apply oil
on the threads.
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2-3bSERVICE PROCEDURE
5. Cylinder Block

B2M1223A
4) Installation of piston rings and oil ring
(1) Install oil ring spacer, upper rail and lower rail in this
order by hand. Then install second ring and top ring
with a piston ring expander.
(2) Position the top ring gap at A or B in the Figure.
(3) Position the second ring gap at 180°on the reverse
side for the top ring gap.
B2M1224A
(4) Position the upper rail gap at C or D in the Figure.
(5) Position the expander gap the at 180°of the
reverse side for the upper rail gap.
(6) Position the lower rail gap at E or F in the Figure.
CAUTION:
Ensure ring gaps do not face the same direction.
Ensure ring gaps are not within the piston skirt area.
G2M0183
5) Install circlip.
Install circlips in piston holes located opposite service
holes in cylinder block, when positioning all pistons in the
corresponding cylinders.
CAUTION:
Use new circlips.
NOTE:
Piston front mark“
”faces toward front of engine.
68
2-3bSERVICE PROCEDURE
5. Cylinder Block

B2M0087A
2. CYLINDER BLOCK
1) Install ST to cylinder block, then install crankshaft bear-
ings.
ST 499817000 ENGINE STAND
CAUTION:
Remove oil the mating surface of bearing and cylinder
block before installation. Also apply a coat of engine
oil to crankshaft pins.
2) Position crankshaft on the #2 and #4 cylinder block.
Tightening torque:
T1: 25±2 N⋅m (2.5±0.2 kg-m, 18.1±1.4 ft-lb)
T2: 47±3 N⋅m (4.8±0.3 kg-m, 34.7±2.2 ft-lb)
69
2-3bSERVICE PROCEDURE
5. Cylinder Block

G2M0185
3) Apply fluid packing to the mating surface of #1 and #3
cylinder block, and position it on #2 and #4 cylinder block.
Fluid packing:
THREE BOND 1215 or equivalent
CAUTION:
Do not allow fluid packing to jut into O-ring grooves,
oil passages, bearing grooves, etc.
B2M0088A
4) Temporarily tighten 10 mm cylinder block connecting
bolts in numerical order shown in Figure.
5) Tighten 10 mm cylinder block connecting bolts in
numerical order.
Tightening torque:
47±3 N⋅m (4.8±0.3 kg-m, 34.7±2.2 ft-lb)
B2M0089A
6) Tighten 8 mm and 6 mm cylinder block connecting bolts
in numerical order shown in Figure.
Tightening torque:


1—
7: 25±2 N⋅m
(2.5±0.2 kg-m, 18.1±1.4 ft-lb)


8: 6.4 N⋅m (0.65 kg-m, 4.7 ft-lb)
G2M0186
7) Install rear oil seal by using ST1 and ST2.
ST1 499597100 OIL SEAL GUIDE
ST2 499587200 OIL SEAL INSTALLER
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2-3bSERVICE PROCEDURE
5. Cylinder Block

3. PISTON AND PISTON PIN (#1 AND #2)
B2M0128A
Tightening torque: N⋅m (kg-m, ft-lb)
T: 69±7 (7.0±0.7, 50.6±5.1)
G2M0188
1) Installing piston
(1) Turn cylinder block so that #1 and #2 cylinders face
upward.
(2) Using ST1, turn crankshaft so that #1 and #2 con-
necting rods are set at bottom dead center.
ST1 499987500 CRANKSHAFT SOCKET
(3) Apply a coat of engine oil to pistons and cylinders
and insert pistons in their cylinders by using ST2.
ST2 498747300 PISTON GUIDE
G2M0189
2) Installing piston pin
(1) Insert ST3 into service hole to align piston pin hole
with connecting rod small end.
CAUTION:
Apply a coat of engine oil to ST3 before insertion.
ST3 499017100 PISTON PIN GUIDE
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2-3bSERVICE PROCEDURE
5. Cylinder Block

(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
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2-3bSERVICE PROCEDURE
5. Cylinder Block