Piston Ring End Gap

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

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 Piston Ring In Cylinder To Bottom Of Ring Travel
Courtesy of FORD MOTOR CO.
Use a feeler gauge to measure the top piston ring end gap and the second piston ring end gap.
- Refer to ENGINE - 5.4L (3V) -- F250-F550 SUPER DUTY PICKUPS , ENGINE - 6.0L DIESEL -- F250-F550 SUPER DUTY PICKUPS or ENGINE - 6.8L (3V) -- F250-F550 SUPER DUTY PICKUPS for appropriate procedure.
  
  Fig 2: Measuring Piston Ring End Gap
  Courtesy of FORD MOTOR CO.