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PISTON FITTING Dodge Challenger III рестайлинг

3.6L Engine - Service Information 4 illustrations ~379 words

PISTON FITTING

The pistons are "select fit" to achieve proper oil clearance. Engine block cylinder bore diameter grade markings (1) are stamped into the left side of the engine block. These marks are read from left to right, corresponding with cylinder number 1, 2, 3, 4, 5, 6.

Engine block cylinder bore diameter grade markings correspond to specific cylinder bore diameters. The chart below identifies the two engine block grade markings and their associated cylinder bore diameters.

Engine Block MarkingCylinder Bore Size mm (in.)
195.995 ± 0.005 mm (3.7793 ± 0.0002 in.)
296.005 ± 0.005 mm (3.7797 ± 0.0002 in.)

Scheme 305

Scheme 305
Scheme 305

The piston is marked with the piston size (1 and 2) on the piston crown. The pistons are available in two different sizes in order to achieve the desired oil clearance. Select the piston size that corresponds to the engine block cylinder bore diameter grade markings for each cylinder.

Pistons are available in two sizes. The chart below identifies the two piston sizes.

Piston MarkingSize mm (in.)
Metal to MetalMetal to Coating
195.995 ± 0.005 mm (3.7793 ± 0.0002 in.)95.970 - 96.000 mm (3.7783 - 3.7795 in.)
295.965 ± 0.005 mm (3.7781 ± 0.0002 in.)95.980 - 96.010 mm (3.7787 - 3.7835 in.)

Scheme 306

Scheme 306
Scheme 306

Note. Typical coated piston shown in illustration.

The coated pistons are serviced with the piston pin and connecting rod pre-assembled. The coating material (1 and 2) is applied to the piston after the final piston machining process. Piston installation into the cylinder bore requires slightly more pressure than that required for non-coated pistons. The bonded coating on the piston will give the appearance of a line-to-line fit with the cylinder bore.

Scheme 307

Scheme 307: DIAL INDICATOR
Scheme 307: DIAL INDICATOR
  1. Mount Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) to a stationary point on the engine. Locate the probe perpendicular to and resting against the connecting rod cap being checked.
  2. Move the connecting rod all the way to the rear of its travel.
  3. Zero the dial indicator.
  4. Move the connecting rod forward to the limit of travel and read the dial indicator. Compare the measured side clearance to the specification. Refer to «Engine - Specifications»(ref-489304-S03924707432012072600000) .
  5. Repeat this procedure for each connecting rod. Rotate the crankshaft for connecting rod accessibility.

Scheme 308

Scheme 308: FEELER GAUGE
Scheme 308: FEELER GAUGE
  1. Slide a snug-fitting feeler gauge between the connecting rod and crankshaft journal flange. Compare the measured side clearance to the specification. Refer to «Engine - Specifications»(ref-489304-S03924707432012072600000) .
  2. Repeat this procedure for each connecting rod. Rotate the crankshaft for connecting rod accessibility.
CAUTIONDO 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.
CAUTIONDo not remove the piston pin from the piston and connecting rod assembly.
  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.