Villager V6-181 3.0L SOHC VIN 1 EFI (1997)
Piston: Testing and Inspection
Cleaning and Inspection
CLEANING
1. Remove any deposits from the piston surfaces.
CAUTION: Do not use caustic compounds or a wire brush to clean the pistons.
NOTE: Always replace the piston ring with a piston ring expander. Clean gum or varnish from the piston skirt, piston pins, and piston rings with
solvent.
2. Use Ring Groove Cleaner D81L-6002-D or equivalent to clean the piston ring grooves. Ensure the oil ring slots (holes) are clean.
INSPECTION
Carefully inspect the pistons for fractures at the ring lands, skirts, and pin bosses. Check for scuffed, rough, or scored skirts. If the lower inner portion
of the ring grooves have high steps, replace the piston. This step will interfere with piston ring operation and cause excessive piston ring side
clearance.
Spongy, eroded areas near the top of the piston are usually caused by detonation or premature ignition. A shiny thrust surface, offset from the
centerline between the piston pin holes, can be caused by a bent connecting rod. Replace pistons showing signs of excessive wear, irregular or
fractured ring lands, or damage from detonation and premature ignition.
Inspect the outer circumferences of all pistons for seizure or scoring. Replace the piston if necessary.
