Mazda 121 - Cylinder Bore

INSPECTION
/
REPAIR
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4. Measure the cylinder bores in
X
and Y directions at ihree
levels
(A,
B, and C) in each cylinder as shown.
Cylinder bore
mm (rnl
Caution
.
The boring size should
be based on the
size of an
overslze
pislon
and be
the
same
tor all
cylinders.
(1)
lf
the cylinder
bore exceeds the maximum, rebore the
cylinder to oversize-
(2)
If the difference between measu.ements A and C ex-
ceeds the maximum taper,
rebore
the cylinder to
overslze.
Taper:0,01gmm
(0.0007
in) max.
(3)
lf the difierence between measurements X and Y ex'
ceeds
the maximum outof-round, febore ihe cy{inder
to oversrze.
Out-ol-round: 0.01gmm
(0.0007
in) max.
5. lfthe upper
part
of a cylinder wall shows uneven wear,
rnove the ridge
with
a
ridge reamer.
B3
Slandard 71.006-71.01 3
(2.7955-2.7958)
0-25
(0.010)
oversize 7 1.256-7 1.263
12.8053,2.4056)
0.s0
(0.020)
overcize
71.506-71.513
12.8152
2.81
55)
0.75
(0
030) oversize
7 t.756-71.763
(2.8250
2.8253)
1.00
(0.04)
oversEe 72.046 72.01 3
12.8349-2.4352)
B-55