Pistons Inspection (3.0L) - Mazda B-Series 1997 Workshop Manual

INSPECTION / REPAIR
Caution
When reboring the cylinder block, base the bore
size on an oversize piston and bore all cylinders to
the same size.
5. If the cylinder bore exceeds the maximum, rebore all
cylinders to oversize diameter.
6. If the difference between measurement A and C exceeds
the maximum taper, rebore all cylinders to oversize
diameter.
Taper: 0.050mm (0.002 in) maximum
7. If the difference between measurements X and Y exceeds
I /
the maximum out-of-round. rebore all cvlinders to the
oversize diameter.
Out-of-round:
Standard: 0.025mm (0.001 in)
Maximum: 0.05mm (0.002 in)
1 I
MB1027-A 4BUOB2-109
PISTONS, PISTON RINGS AND PISTON PINS
Pistons
1. Inspect the outer circumferences of all pistons for seizing
and scoring. Replace as necessary.
2.
Measure the outer diameter of each piston at a right
angle (90") to the piston pin 14.58mm (0.57 in) below
the bottom of the oil ring.
Note
The pistons are color-coded red, blue, or yellow on
the dome of the piston.
Piston diameter:
mm (in)
Piston
Color Diameter
88.962-88.978 13.5024-3.503T
I
I
Blue
1
88.988-89.004 13.5035-3.50411
1
(
Yellow
j
89.014--89.030 13.5045-3.5051}
1
MB1285-A
Note
Oversize pistonsareavailable in the following sizes:
0.508mm (0.020 in), 0.762mm (0.030 in) and 1 .016mm
(0.040 in).