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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1819 (Engine Mechanical - 3.5L (L66)) >> Repair Instructions >> Off Vehicle Repair Instructions >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston Selection

Piston Selection

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Measuring Piston Diameter
    GM1308158Courtesy of GENERAL MOTORS CORP.
  1. Measure the piston diameter.
  2. Measure the cylinder bore diameter. Refer to Engine Block Cleaning and Inspection .
  3. Calculate the clearance between the piston and the cylinder bore.

    Specification: 

    • Piston-to-bore clearance - new: 0.015-0.04 mm (0.0006-0.0016 in)
    • Piston-to-bore clearance - service limit: 0.08 mm (0.003 in)

  4. A 0.25 mm (0.010 in) oversize piston can be identified by the numbers 25 on the top of the piston.