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3. Remove the valve stem keys (225). 4. Remove the valve spring cap (224). 5. Remove the valve spring (223). 6. Remove the valves (228). 7. Remove the valve stem oil seal (222). Refer to Separating Parts. Fig. 472: Locating Cylinder Head Core Hole Plug 8. Remove the cylinder head core hole plugs (216), as required.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 473: Locating Coolant Temperature Sensor 9. Remove the coolant temperature sensor (725) from the left cylinder head.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 474: Locating Coolant Plug 10. Remove the cylinder head plug (229) from the right cylinder head. Disassemble CYLINDER HEAD CLEANING AND INSPECTION Tools Required
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
J 8089 Carbon Removal Brush. See Special Tools. J 9666 Valve Spring Tester. See Special Tools. Cleaning and Inspection Fig. 475: Cleaning Carbon Using J 8089 CAUTION: Refer to Safety Glasses Caution .
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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