Piston - Ring End Gap

CAUTION: Use care when fitting piston rings to avoid possible damage to the piston ring or the cylinder bore.

CAUTION: Piston rings should not be transferred from one piston to another.

NOTE: Cylinder bore must be within specification for taper and out-of-round.

Use a piston without rings to push a piston ring in a cylinder to the bottom of ring travel.

Fig 1: Pushing A Piston Ring In A Cylinder To The Bottom Of Ring Travel
Courtesy of MAZDA MOTORS CORP.
Use a feeler gauge to measure the top piston ring end gap and the second piston ring end gap. Refer to SPECIFICATIONS .

Fig 2: Measuring Top Piston Ring End Gap
Courtesy of MAZDA MOTORS CORP.