Piston Inspection

WARNING: This page is about a different car, the 2004 Lincoln Navigator and 2004 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Special Tool Chart

Courtesy of FORD MOTOR CO.

CAUTION: Do not use a caustic cleaning solution or a wire brush to clean the pistons or damage can occur.

Clean and inspect the (1) ring lands, (2) skirts, (3) pin bosses, and the (4) tops of the pistons. If wear marks, scores or glazing is found on the piston skirt, check for a bent or twisted connecting rod.

Fig 2: Identifying Ring Lands, Skirts, Pin Bosses, And Tops Of Pistons
Courtesy of FORD MOTOR CO.
Use the Piston Ring Groove Scraper to clean the piston ring grooves.
- Make sure the oil ring holes are clean.
Fig 3: Cleaning Piston Ring Grooves, Using Piston Ring Groove Scraper
Courtesy of FORD MOTOR CO.