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1. Clean the following components: Use the J 8089 in order to remove the carbon from the combustion chambers. See Gasket surfaces Refer to Replacing Engine Gaskets . Valve stems and heads on a buffing wheel Bolt hole threads Remove all dirt, debris, or threadlocking material from the bolt holes. 2. Inspect the cylinder head for the following conditions: 1. Cracks in the exhaust ports and combustion chambers 2. External cracks in the water chambers 3. Gasket surfaces for excessive scratches or gouging Refer to Replacing Engine Gaskets . 4. Bolt hole threads for debris or damaged threads Refer to Thread Repair or Thread Repair Specifications . IMPORTANT: When cleaning a cylinder head in a thermal type oven, Be careful not to scuff the chamber.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 476: Inspecting Cylinder Head For Warpage 3. Inspect the cylinder head for warpage. Refer to Engine Mechanical Specifications.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 477: Measuring Valve Spring Tension 4. Use the J 9666 in order to measure the valve spring tension. See Special Tools. Refer to Engine Mechanical Specifications. VALVE GUIDE REAMING, AND VALVE AND SEAT GRINDING Tools Required
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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