Subaru XT 1988 Service Manual page 192

l
2-3
ENGINE
2) Boring and honing
(1) If the value of taper, out-of-roundness, or cylinder-to-
piston clearance measured exceeds the specified limit or
if there is any damage on the cylinder wall, rebore it to
use an oversize piston.
When any of the cylinders needs reboring, all other cylinders
must be bored at the same time, and use oversize pistons. 00
not perform boring on one cylinder only, nor use an oversize
piston for one cylinder only.
(2) Get four of the oversize pistons and measure the
outer diameter of each piston at the height shown in the
figure. (Thrust direction)
Measurement should be performed at a temperature of 20°C
(68 0 F).
Piston outer diameter:
Fig. 76
Fig. 77
Standard
91.970 - 91.980 mm (3.6209 - 3.6213 in)
0.25 mm (0.0098 in) oversize
92.220 - 92.230 mm (3.6307 - 3.6311 in)
0.50 mm (0.0197 in) oversize
92.470 - 92.480
mm
(3.6405 - 3.6409 in)
O(@) ]
L2-813
A5-071
(3) If the cylinder inner diameter exceeds the following
enlarging limit after boring and honing, replace the
crankcase.
Immediately after reboring, the cylinder diameter may differ
from its real diameter due to temperature rise. Thus, pay
attention to this when measuring the cylinder diameter.
36
Enlarging limit of cylinder inner diameter:
0.30 mm (0.0118 in)
(4) Inspect the cyl inder bore for taper, out-of-roundness,
and diameter differences.
Measure ,the inner diameter of the cylinder when the tempera-
ture is 20°C (68°F).
Diameter difference between cylinders:
0.060 mm (0.0020 in) or lell
ASSEMBLY
1) Install ENGINE STANDS (499817100) to cylinder
blocks. When installing ENGINE STANDS, fit bolts to the
holes marked with "R" on the #1 and
#3
cylinder sides, and
to the holes marked with ilL" on the
#2
and #4 cylinder sides.
2) I nstall crankshaft bearings to cylinder blocks.
3) Install crankshaft to left-hand cylinder block.
4) Fit a-ring and back-up ring to coolant passage of left-hand
cylinder block.
5) Apply fluid packing (Three-bond 1215, or equivalent) to
mating surface of cylinder block.
Apply liquid Packing along this line.
L2-582
Fig.
78