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Fig. 400: Measuring Crankshaft Thrust Wall Width 9. Measure the crankshaft thrust wall width. A crankshaft with a thrust wall width in excess of 26.2 mm (1.0315 in) (a) must be replaced. Fig. 401: Measuring Crankshaft Runout
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Courtesy of GENERAL MOTORS CORP. 10. Measure the crankshaft runout. Use wooden V-blocks or a fixture to support the crankshaft on the front and rear journals. 11. Use the J 7872 in order to measure the crankshaft runout at the front and rear intermediate journals. 12. Use the J 7872 in order to measure the runout of the crankshaft rear flange. 13. Use the J 7872 in order to measure the runout of the crankshaft position reluctor ring. Reluctor ring runout should be measured 1.0 mm (0.04 in) below the ring teeth. If the reluctor ring has runout in excess of 0.7 mm (0.028 in), replace the crankshaft. Fig. 402: Identifying Crankshaft Bearing Craters Or Pockets 14. Inspect crankshaft bearings for craters or pockets. Flattened sections on the bearing halves also indicate fatigue.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 403: Identifying Connecting Rod Bearing Scoring Or Discoloration 15. Inspect the crankshaft bearings for excessive scoring or discoloration. 16. Inspect the crankshaft bearings for dirt or debris imbedded into the bearing material.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 404: View Of Improper Seating 17. Inspect the crankshaft bearings for improper seating, indicated by bright, polished sections of the bearing. If the lower half of the bearing is worn or damaged, both upper and lower halves should be Generally, if the lower half is suitable for use, the upper half should also be suitable for use. Measuring Main Bearing Clearance - Gaging Plastic Method
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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