Piston Inspection - Mazda B-Series 1997 Workshop Manual

INSPECTION 1 REPAIR
Caution
When reboring the cylinder block, base the bore
size on an oversize piston and bore all cylinders t o
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: 0.254mm (0.010 in)
7. If the difference between measurements X and Y exceeds
the maximum out-of-round, rebore all cylinders to the
oversize diameter.
Out-of-round
Standard: 0.0381 mm (0.001 5 in]
Maximum: 0.127mm (0.005 in)
MB1027-A
I
4ELUOB3-115
PISTON, PISTON RING AND PISTON PIN
Piston
1. Inspect the outer circumferences of all pistons for seizing
and scoring. Replace as necessary.
2. Measure outer diameter of each piston at a right angle
(90") to the piston pin 25.4 mm (1 .OO in) below the oil ring
groove.
Piston diameter
mm {in)
I
Standard
1
100.40-1 00.408 13.9524-3.9531 1
1
I
0.50 10.0201 oversize
1
100.90-1 00.908 13.9724-3.9731 1
1
3. Measure the piston-to-cylinder clearance.
Clearance:
0.020-0.048mrn (0.0008-0.00119 in)
4. If the oil clearance exceeds the maximum, replace the
piston or rebore the cylinders to fit oversize pistons.
Note
If a piston is replaced, the piston ring must also be
replaced.