Piston Ring End Gap

SPECIAL TOOLS CHART

Feeler Gauge Set 303-D027 (D81L-4201-A) or equivalent

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: Refer to the appropriate Engine article for the specification.

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: Checking Piston Ring End Gap Using Piston
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.