Connecting Rod Inspection - Mazda B-Series 1997 Workshop Manual

INSPECTION / REPAIR
B1
Piston pin
1. Measure each piston pin bore diameter in X and Y
directions at four points.
Diameter
23.1725-23.1 800mm (0.91 23-0.9126 in)
2. Measure each piston pin diameter in the X and Y direc-
tions at four points.
I I
Diameter
I
I
MB1032-A 6BUOB1-020
Standard
23.1 67-23.1 70mm C0.9121-0.9122 in)
0.001 Oversize:
23.193-23.195mm (0.91 31-0.91 32 in)
0.002 Oversize:
23.21 8-23.221 mm (0.91 41 -0.91 42 in)
=arance.
3. Calculate the related piston to pin cl~,
Clearance
0.005-0.01 0mm (0.0002-0.00014 in)
4. If the clearance exceeds specification, replace the piston
and/or piston pin.
5. Measure each piston pin length.
Length:
62.3-70.1 mm (2.73-2.76 in)
6. If the length exceeds specifications, replace the piston
pin.
CONNECTING ROD
1. Measure the small end inner bore diameter of each
connecting rod.
Diameter:
23.1 24-23.1 44mm (0.91 04-0.91 12 in)
Caution
If the connecting rod is replaced, the connecting
rod cap must also be replaced, since they are a
matched set.
2.
Check the bend and twist factor of each connecting rod.
Repair or replace
as
necessary.
Bend: 0.038mm (0.0015 in)
Twist: 0.076mm (0.003 in)
Length (Center to Center):
138.58-1 38.67mm (5.4558-5.4591 in)