Durango 2WD V8-4.7L VIN N (2001)
Piston: Procedures
Cleaning and Inspection
CLEANING
CAUTION: DO NOT use a wire wheel or other abrasive cleaning devise to clean the pistons or connecting rods. The pistons have a Moly coating,
this coating must not be damaged.
1. Using a suitable cleaning solvent clean the pistons in warm water and towel dry.
2. Use a wood or plastic scraper to clean the ring land grooves.
CAUTION: DO NOT remove the piston pin from the piston and connecting rod assembly.
INSPECTION
Check the connecting rod journal for excessive wear, taper and scoring.
4. Mark connecting rod and bearing cap positions using a permanent ink marker or scribe tool (Fig. 74)
Check the connecting rod for signs of twist or bending.
Check the piston for taper and elliptical shape before it is fitted into the cylinder bore.
Check the piston for scoring, or scraping marks in the piston skirts. Check the ring lands for cracks and/or deterioration.
Piston to Cylinder Bore Fitting
STANDARD PROCEDURE-PISTON FITTING
1. To correctly select the proper size piston, a cylinder bore gauge, capable of reading in 0.003 mm. (0.0001 inch) INCREMENTS is required. If a
bore gauge is not available, do not use an inside micrometer.
