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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Engine Mechanical - 4.6L - 3 Of 4) >> Off-Vehicle Repair Instructions (2 Of 3) >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston Pin Bore Measurement Procedure

Piston Pin Bore Measurement Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Measuring Piston Pin Diameter
    GM4976Courtesy of GENERAL MOTORS CORP.
  1. Piston pin bores and pins must be free of varnish or scuffing.
  2. Use an outside micrometer to measure the piston pin in the piston contact areas.
    3. Fig 2: Measuring Piston Pin Bore
    GM1400636Courtesy of GENERAL MOTORS CORP.
  3. Using an inside micrometer, measure the piston pin bore.
  4. Subtract the measurement of the piston pin bore from the piston pin.
  5. Compare the result with the Engine Mechanical Specifications (LD8) or Engine Mechanical Specifications (L37) .
  6. If the clearance is excessive, determine which piece is out of specification and replace as necessary.
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