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Piston Ring End Gap

SPECIAL TOOLS

G06064067
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 ENGINE MECHANICAL - 3.5L or ENGINE MECHANICAL - 3.5L-GTDI for the specification.
NOTE: The cylinder bore must be within specification for taper and out-of-round.
  1. 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 To Bottom Of Ring Travel
    G06064079Courtesy of FORD MOTOR CO.
  2. Use the Feeler Gauge Set to measure the top piston ring end gap and the second piston ring end gap.
    Fig 2: Measuring Top Piston Ring End Gap And Second Piston Ring End Gap
    G06064080Courtesy of FORD MOTOR CO.