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5. Inspect the outer surfaces of the crankshaft bearings for the following conditions: Wear - surface wear indicates either movement of the insert or high spots in the Overheating or discoloration Looseness or rotation indicated by flattened tangs and wear grooves 6. Inspect the crankshaft main bearings for craters or pockets. Flattened sections on the crankshaft bearing halves also indicate fatigue. 7. Inspect the thrust surfaces of the main thrust bearing for the following conditions: Wear Grooving - Grooves are caused by irregularities of the crankshaft thrust surface. 8. Inspect the crankshaft bearings for excessive scoring or discoloration. 9. Inspect the crankshaft bearings for dirt or imbedded debris. 10. Inspect the crankshaft bearings for improper seating indicated by bright, polished sections. 11. Inspect the crankshaft bearings for uneven side-to-side wear. This may indicate a bent crankshaft or a tapered bearing journal. 12. Inspect the connecting rod bearing bores using the following procedure: 1. Tighten the connecting rod bearing cap to specification. 2. Use J 8087 to measure the bearing bore for taper and out-of-round. See Special Tools. Record the readings. 3. No taper or out-of-round should exist. IMPORTANT: Note the location of the crankshaft main bearing high spots. If the spots are not in line, the crankshaft is bent. Replace the IMPORTANT: If crankshaft bearing failure is due to conditions other than normal wear, investigate the cause of the condition. Inspect
2007 Hummer H3 2007 ENGINE Engine Mechanical - 3.7L - H3
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