F 150 4WD V8-5.4L Flex Fuel (2008)
Piston: Procedures
Piston Inspection
Special Tool(s)
CAUTION: Do not use a caustic cleaning solution or a wire brush to clean the pistons or damage can occur.
1. 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.
2. Use the Piston Ring Groove Scraper to clean the piston ring grooves.
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Make sure the oil ring holes are clean.
Piston Pin Bore Diameter
1. WARNING: Since the retainer ring has a tendency to spring out, cover the end of the pin bore with a hand or shop rag when removing
the ring. Wear eye protection. Failure to follow these instructions may result in serious personal injury.
NOTE: Piston and piston pins are a matched set and should not be interchanged.
Measure the piston pin bore diameter in 2 directions on each side. Verify the diameter is within specification.
