Piston Ring Thickness Inspection

• Measure the piston ring thickness.

Use the micrometer to measure at several points around the ring.

Piston Ring Thickness Standard:

Top [A] 0.77 0.79 mm (0.0303
0.0311 in.)

Second [B] 0.78 0.79 mm
(0.0307 0.0311 in.)

Service Limit:

Top 0.70 mm (0.0276 in.)

Second 0.71 mm (0.0280 in.)

If any of the measurements is less than the service limit on either of the rings, replace all the rings.

NOTE

When using new rings in a used piston, check for uneven groove wear. The rings should fit perfectly parallel to the groove sides. If not, replace the piston.