General Procedure

NOTE: Refer to general specifications in the appropriate 303-01 engine section for the appropriate specification.

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

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

NOTE: The 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 Piston Ring In Cylinder
Courtesy of FORD MOTOR CO.
Use the Feeler Gauge Set to measure the top piston ring end gap and the second piston ring end gap.

Fig 2: Measuring Piston Ring End Gap
Courtesy of FORD MOTOR CO.