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Fig. 458: Measuring Camshaft Lobe Lift 1. Measure camshaft lobe lift using J 8520 . See Special Tools and Equipment . 2. Remove the valve rocker arms and bolts 3. Install the dial indicator mounting stud into the valve rocker arm bolt hole. 4. Assemble the components of the J 8520 and position onto the stud. See Special Tools and Equipment . 5. Position the shaft of the dial indicator onto the end of the pushrod. 6. Rotate the face of the dial indicator to zero. 7. Slowly rotate the crankshaft clockwise until the dial indicator obtains its highest and lowest readings. 8. Compare the total lift shown to specifications: z The proper lobe lift for 6.0L intake lobes is 6.96 mm (0.274 in). z The proper lobe lift for 6.0L exhaust lobes is 7.13 mm (0.281 in). CAMSHAFT BEARING INSTALLATION Tools Required J 33049 Camshaft Bearing Service Set. See Special Tools and Equipment . IMPORTANT: Measuring camshaft lobe lift is a procedure used to determine if the camshaft lobes have worn. This test is to be performed prior to engine
2004 Hummer H2 2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2
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