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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 534 (Engine Mechanical - Hybrid (LZ1) - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Engine Block Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Measuring Bore Gauge With Micrometer
    GM4974Courtesy of GENERAL MOTORS COMPANY
  1. Inspect the following components:
    • Cylinder walls for excessive scratches, gouging, or ring ridge
    • Cylinder bores for excessive ring ridge at the top of the cylinder
    • Coolant jacket for cracks
    • Valve lifter bores for excessive scoring or wear
    • Crankshaft bearing webs for cracks
    • Gasket sealing surfaces for excessive scratches or gouging - Refer to Replacing Engine Gaskets .
    • Oil galleries for restrictions
    • Threaded bolt holes for damaged threads
    • Cylinder bores for excessive ring ridge at the top of the cylinder
  2. Measure the cylinder bores for an oversize condition.