Piston And Piston Rings Inspection (4.0L); Piston And Piston Pin Inspection (4.0L) - Mazda B-Series 1997 Workshop Manual

INSPECTION 1 REPAIR
PISTON
RING
Piston and Piston Rings
1. Measure the piston to ring land clearance around the
entire circumference by using a new piston ring.
Clearance
Top: 0.0514.084mm (0.00204.0033 in)
Bottom: 0.0514.084mm (0.00264.0033 in)
Oil Ring: Snug fit
Maximum: 0.1524mm (0.006 in)
2. If the clearance exceeds the maximum, replace the pis-
ton.
3. Inspect the piston ring for damage, abnormal wear, or
breakage. Replace as necessary.
4.
Insert piston ring into cylinder by hand and use the piston
to push it to the bottom of the ring travel.
5. Measure each piston ring end gap by using afeelergauge.
Replace if necessary.
End gap
Top: 0.381-0.584mm (0.01 5-4.023 in)
Bottom: 0.381--0.584mm (0.015-0.023 in)
Oil Ring: 0.381-1.397mm (0.015--0.055 in)
Piston and Piston Pin
1.
Measure the piston pin bore diameter in X and Y directions
at four points.
Diameter: 24.003-24.008mm (0.94504.9452 in]