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1. Lift the valve off the valve seat. 2. Apply a dab of blue dye to the valve face. 3. Seat and rotate the valve. The blue dye traces transferred to the valve seat are an indication of concentricity of the valve seat. 13. Use the following procedure to measure the valve runout: 1. Clean off the blue dye. 2. Apply blue dye to the valve seat. 3. Seat and rotate the valve. 4. The traces of blue dye transferred to the valve indicates valve runout. 14. Replace the head if the valve seats are damaged. 15. Inspect the valves for the following damage: Grooving (1, 2) Bent valve stem (3). Replace any bent valve. Burrs or scratches (4). Minor burrs or scratches may be removed with a fine oil stone. Chipped or worn key grooves (5). Replace if damaged. Valve tip wear (6). Replace if worn. CYLINDER HEAD ASSEMBLE Tools Required J 8062 Valve Spring Compressor. See Special Tools. J 42037 Valve Spring Compressor Adapter. See Special Tools. J 38820 Valve Stem Seal Remover/Installer. See Special Tools. 1. Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent to the threads. NOTE: Refer to Fastener Notice in Cautions and Notices.
2006 Hummer H3 2006 ENGINE Engine Mechanical - 3.5L (L52) - H3
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