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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (5.7L Engine (Service Information)) >> Engine Block >> Rod-Piston & Connecting >> Standard Procedure >> Piston Fitting

Piston Fitting

WARNING: This page is about a different variant/trim than selected.
Fig 1: Measuring Inside Diameter Of Cylinder Bore Using Bore Gauge - Typical
GC0003988Courtesy of CHRYSLER LLC
1 - FRONT
2 - BORE GAUGE
3 - CYLINDER BORE
4 - 38 MM
(1.5 in)
  1. To correctly select the proper size piston, a cylinder bore gauge (2), capable of reading in 0.003 mm (0.0001 in.) INCREMENTS is required. If a bore gauge is not available, do not use an inside micrometer.
  2. Measure the inside diameter of the cylinder bore at a point 38.0 mm (1.5 inches) below top of bore (4). Start perpendicular (across or at 90 degrees) to the axis of the crankshaft at point A (1) and then take an additional bore reading 90 degrees to that at point B (1).
  3. The coated pistons will be serviced with the piston pin and connecting rod pre-assembled. The piston-rod assembly is specific for the left cylinder bank (odd numbered) and the right cylinder bank (even numbered) and must not be interchanged.
    Fig 2: Moly Coated Piston
    GC0003987Courtesy of CHRYSLER LLC
    1 - MOLY COATED
    2 - MOLY COATED
  4. Measure the piston diameter with a micrometer at points (1,2).