1997 SUBARU LEGACY ESP

B2M1228A
B: ADJUSTMENT
1. 2200 cc MODEL
CAUTION:
Adjustment of valve clearance should be performed
while engine is cold.
1) Set #1 cylinder piston to top dead center of compres-
sion stroke by rotating crankshaft pulley clockwise.
NOTE:
When arrow mark on camshaft sprocket (RH) comes
exactly to the top, #1 cylinder piston is brought to the top
dead center of compression stroke.
B2M1238A
2) Adjust the #1 cylinder valve clearance.
(1) Loosen the valve rocker nut and screw.
(2) Place suitable thickness gauge.
(3) While noting valve clearance, tighten valve rocker
adjust screw.
(4) When specified valve clearance is obtained, tighten
valve rocker nut.
Tightening torque:
10±1 N⋅m (1.0±0.1 kg-m, 7.2±0.7 ft-lb)
CAUTION:

Insert the thickness gauge in as horizontal a direc-
tion as possible with respect to the valve stem end
face.

Adjust exhaust valve clearances while lifting-up the
vehicle.
Valve clearance:
Intake: 0.20±0.02 mm (0.0079±0.0008 in)
Exhaust: 0.25±0.02 mm (0.0098±0.0008 in)
3) Ensure that valve clearances are within specifications.
4) Turn crankshaft two complete rotations until #1 cylinder
piston is again set to top dead center on compression
stroke.
5) Ensure that valve clearances are within specifications.
If necessary, re-adjust valve clearances.
14
2-2
7. Valve Clearance

B2M1230A
6) Similar to adjustment procedures used for #1 cylinder,
adjust #2, #3 and #4 cylinder valve clearances.
NOTE:

Be sure to set cylinder pistons to their respective top
dead centers on compression stroke before adjusting valve
clearances.

To set #3, #2 and #4 cylinder pistons to their top dead
centers on compression stroke, turn crankshaft pulley
clockwise 90°at a time starting with arrow mark on right-
hand camshaft sprocket facing up.
B2M1234A
2. 2500 cc MODEL
CAUTION:
Adjustment of valve clearance should be performed
while engine is cold.
1) Measure all valve clearances.
NOTE:
Record each valve clearance after it has been measured.
2) Remove timing belt, camshaft sprockets, and related
parts.
3) Remove camshaft.
B2M1240A
4) Remove shim from valve lifter.
5) Measure thickness of shim with micrometer.
15
2-2
7. Valve Clearance

B2M1233A
B2M1234A
10) Turn crankshaft pulley clockwise until arrow mark on
camshaft sprocket is set to position shown in figure.
11) Ensure that #1 cylinder intake valve and #3 cylinder
exhaust valve are adjusted to specifications.
CAUTION:

Insert the thickness gauge in as horizontal a direc-
tion as possible with respect to the shim.

Adjust exhaust valve clearances while lifting-up the
vehicle.
Valve clearance:
Intake: 0.20±0.02 mm (0.0079±0.0008 in)
Exhaust: 0.25±0.02 mm (0.0098±0.0008 in)
12) Turn crankshaft two complete rotations. Check again
to ensure that #1 cylinder intake valve and #3 cylinder
exhaust valve clearances are within specifications. If
necessary, re-adjust valve clearances.
B2M1235A
13) Further turn crankshaft pulley clockwise. Using the
same procedures as in step 11) above, measure valve
clearances.
(1) Set arrow mark on camshaft sprocket to position
shown in figure, and check #2 cylinder exhaust valve
and #3 cylinder intake valve clearances.
B2M1236A
(2) Set arrow mark on camshaft sprocket to position
shown in figure, and check #2 cylinder intake valve and
#4 cylinder exhaust valve clearances.
B2M1237A
(3) Set arrow mark on camshaft sprocket to position
shown in figure, and check #1 cylinder exhaust valve
and #4 cylinder intake valve clearances.
17
2-2
7. Valve Clearance

B2M0387A
B2M0076A
3. VALVE GUIDE
1) Check the clearance between valve guide and stem.
The clearance can be checked by measuring the outside
diameter of valve stem and the inside diameter of valve
guide with outside and inside micrometers respectively.
Clearance between the valve guide and valve stem:
Standard
Intake
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)
Valve guide inner diameter:
6.000—6.012 mm (0.2362—0.2367 in)
Valve stem outer diameters:
Intake
5.950—5.965 mm (0.2343—0.2348 in)
Exhaust
5.945—5.960 mm (0.2341—0.2346 in)
G2M0150
2) If the clearance between valve guide and stem exceeds
the specification, replace guide as follows:
(1) Place cylinder head on ST1 with the combustion
chamber upward so that valve guides enter the holes
in ST1.
(2) Insert ST2 into valve guide and press it down to
remove valve guide.
ST1 498267200 CYLINDER HEAD TABLE
ST2 499767200 VALVE GUIDE REMOVER
G2M0151
(3) Turn cylinder head upside down and place ST as
shown in the Figure.
ST 499767000 VALVE GUIDE ADJUSTER
B2M0388A
(4) Before installing new oversize valve guide, make
sure that neither scratches nor damages exist on the
inside surface of the valve guide holes in cylinder head.
(5) Put new valve guide, coated with sufficient oil, in
cylinder, and insert ST1 into valve guide. Press in until
the valve guide upper end is flush with the upper sur-
face of ST2.
ST1 499767200 VALVE GUIDE REMOVER
ST2 499767000 VALVE GUIDE ADJUSTER
42
2-3SERVICE PROCEDURE
6. Cylinder Head

C: INSPECTION
1. CYLINDER BLOCK
1) Check for cracks and damage visually. Especially,
inspect important parts by means of red lead check.
2) Check the oil passages for clogging.
3) Inspect crankcase surface that mates with cylinder
head for warping by using a straight edge, and correct by
grinding if necessary.
Warping limit:
0.05 mm (0.0020 in)
Grinding limit:
0.1 mm (0.004 in)
Standard height of cylinder block:
201.0 mm (7.91 in)
B2M0082A
2. CYLINDER AND PISTON
1) The cylinder bore size is stamped on the cylinder
block’s front upper surface.
NOTE:
Standard sized pistons are classified into two grades,“A”
and“B”. These grades should be used as a guide line in
selecting a standard piston.
Standard diameter:
A: 96.905—96.915 mm (3.8151—3.8155 in)
B: 96.895—96.905 mm (3.8148—3.8151 in)
56
2-3SERVICE PROCEDURE
7. Cylinder Block

B2M1211A
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.
B2M1212A
(4) Position the upper rail gap at C or D in the Figure.
(5) Position the expander gap 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“
”facer toward front of engine.
66
2-3SERVICE PROCEDURE
7. Cylinder Block

B2M0698A
When timing belts are not installed, four camshafts
are held at the“zero-lift”position, where all cams on
camshafts do not push intake and exhaust valves
down. (Under this condition, all valves remain
unlifted.)
When camshafts are rotated to install timing belts,
#2 intake and #4 exhaust cam of left-hand camshafts
are held to push their corresponding valves down.
(Under this condition, these valves are held lifted.)
Right-side camshafts are held so that their cams do
not push valves down.
Left-hand camshafts must be rotated from the“zero-
lift”position to the position where timing belt is to be
installed at as small an angle as possible, in order to
prevent mutual interference of intake and exhaust
valve heads.
Do not allow camshafts to rotate in the direction
shown in the upper of figure as this causes both intake
and exhaust valves to lift simultaneously, resulting in
interference with their heads.
B2M0699
2) Installation of timing belt
Align alignment mark on timing belt with marks on sprock-
ets in the numerical order shown in figure. While aligning
marks, position timing belt properly.
CAUTION:
Ensure belt’s rotating direction is correct.
G2M0738
26
2-3bSERVICE PROCEDURE
2. Timing Belt

G2M0761
2. VALVE SEAT
Inspect intake and exhaust valve seats, and correct the
contact surfaces with valve seat cutter if they are defective
or when valve guides are replaced.
Valve seat width: W
Intake
Standard
1.0 mm (0.039 in)
Limit
1.7 mm (0.067 in)
Exhaust
Standard
1.5 mm (0.059 in)
Limit
2.2 mm (0.087 in)
3. VALVE GUIDE
1) Check the clearance between valve guide and stem.
The clearance can be checked by measuring the outside
diameter of valve stem and the inside diameter of valve
guide with outside and inside micrometers respectively.
Clearance between the valve guide and valve stem:
Standard
Intake
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)
Valve guide inner diameter:
6.000—6.015 mm (0.2362—0.2368 in)
Valve stem outer diameter:
Intake
5.950—5.965 mm (0.2343—0.2348 in)
Exhaust
5.950—5.965 mm (0.2343—0.2348 in)
39
2-3bSERVICE PROCEDURE
4. Cylinder Head