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

INSPECTION / REPAIR
- I t + -
CLEARANCE
3. Measure the piston-to-cylinder bore clearance.
Clearance: 0.030--0.056mm (0.00'1 2-4.0022
in}
Maximum: 0.081 mm (0.0031 in)
4. If the clearance exceeds the maximum, replace the piston
or rebore the cylinders to fit oversize pistons.
Note
If a piston is replaced, the piston rings of that
piston must also be replaced.
MB1028-A 5ElUOB2-039
Piston Rings
1. Measure the piston-to-ring land clearance around the
entire circumference by using a newf piston ring.
Clearance
Top: 0.0404.095mm (0.001 6-0.0037 in)
Bottom: 0.0404.095mm (0.0016-0.0037 in)
Oil Ring: Snug fit
Service Limit: 0.15mm (0.006 in) maximum
2. If the clearance exceeds the maxi!mum, replace the
MBI 029-A
piston.
3. Inspect the piston rings for damage, abnormal wear, or
breakage. Replace as necessary.
PISTON
RING
4. Insert the piston ring into the cylinder by hand and use the
piston to push it to the bottom of the ring travel.
Caution
Use care to avoid damage to the ring or the cylinder
bore.
5. Measure each piston ring end gap by using a feeler
gauge. Replace if necessary.
End gap
Top: 0.25--0.50mm (0.01 0-0.0:20 in)
Bottom: 0.25-0.50mm (0.010-.0.020 in)
Oil Ring: 0.25-.1.25mm (0.010--0.049 in)