LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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Print Preview Version 8.0 PubTeX output 2006.06.15:1036 File: C:\DOCUME~1\PCOMPO~1.IGS\LOCALS~1\Temp\.aptcache\2006LS7/tfa01804.dvi User: PComposer Page: 502006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalThe accessory drive components may have an affect on engine vibration. An overcharged air conditioning (A/C) system, apower steering system restriction, or the incorrect fluid, or an extra load placed on the generator are suggested items toinspect. To help identify an intermittent or an improper condition, vary the loads on the accessory drive components.Test DescriptionThe numbers below refer to the steps in the diagnostic table.2. This test is to verify that the vibration is present during diagnosing. Other vehicle components may cause a similarsymptom such as the exhaust system, or the drivetrain.3. This test is to verify that the drive belts or accessory drive components may be causing the vibration. Removethe drive belts and operate the engine for a few seconds, this will verify if the vibration is related to the drive belts or not.With the drive belts removed the water pump will not operate and the engine may overheat. Also diagnostic trouble codes(DTCs) may set when the engine is operated with the drive belts removed.4. The drive belts may cause a vibration. While the drive belts is removed this is the best time to inspect thecondition of the drive belts.6. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed.8. This step should only be performed if the fan is driven by the drive belt. Inspect the engine cooling fan for bent,twisted, loose, or cracked blades. Inspect the fan clutch for smooth operation. Inspect for a bent fan shaft or a bentmounting flange.9. Inspect the water pump drive shaft for being bent. Also inspect the water pump bearings for smooth operationand excessive play. Compare the water pump with a known, good water pump.10. Accessory drive component brackets that are bent, cracked, or loose may put an extra strain on that accessorycomponent causing it to vibrate.Step Action Yes NoNotice: Refer to Belt Dressing Notice in Cautions and Notices.DEFINITION: The following items are indications of drive belt vibration:• The vibration is engine-speed related.• The vibration may be sensitive to accessory load.1Did you review the Symptoms – Engine Mechanical diagnosticinformation, and perform the necessary inspections? Go to Step 2Go to Symptoms -Engine Mechanical2Verify that the vibration is engine related.Does the engine make the vibration? Go to Step 3 Go to Diagnostic Aids31. Remove the drive belts. Refer to Drive Belt Replacement -Accessory or Drive Belt Replacement - Air Conditioning .2. Operate the engine for no longer than 30–40 seconds.Does the engine still make the vibration?Go to VibrationAnalysis - Enginein Vibration Diagnosisand Correction Go to Step 4456Inspect the drive belts for wear, damage, debris build-up andmissing drive belt ribs.Were any of these conditions found? Go to Step 5 Go to Step 6Install a new drive belt. Refer to Drive Belt Replacement -Accessory or Drive Belt Replacement - Air Conditioning .Did you complete the replacement? Go to Step 11 —Inspect for incorrect, loose or missing fasteners.Were any of these conditions found? Go to Step 7 Go to Step 850 of 272
Print Preview Version 8.0 PubTeX output 2006.06.15:1036 File: C:\DOCUME~1\PCOMPO~1.IGS\LOCALS~1\Temp\.aptcache\2006LS7/tfa01804.dvi User: PComposer Page: 512006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalStep Action Yes No78910111. Replace the incorrect or missing fasteners.2. Tighten any loose fasteners. Refer to Fastener TighteningSpecifications .Were the fasteners replaced and/or tightened? Go to Step 11 —Inspect for damaged fan blades or a bent fan clutch shaft.Did you find and correct the condition? Go to Step 11 Go to Step 9Inspect for a bent water pump drive shaft.Did you find and correct the condition? Go to Step 11 Go to Step 10Inspect for a bent or cracked accessory drive brackets.Did you find and correct the condition? Go to Step 11 —1. Clear any codes.2. Run the engine in order to verify the repair.Does the vibration still exist? — System OKDiagnostic Information and Procedures1399829Drive Belt Falls Off DiagnosisDrive Belt:Falls Off Diagnosis:Engine Mechanical - 4.8L, 5.3L, and 6.0LDiagnostic AidsIf the drive belts repeatedly fall off the accessory drive pulleys, this may be caused by pulley misalignment.An extra load that is quickly applied or released by an accessory drive component may also cause the drive belts to fall off.Verify that the accessory drive components are operating properly.If the drive belts are the incorrect length, the drive belt tensioners may not maintain the proper tension on the drive belts.Test DescriptionThe numbers below refer to the steps in the diagnostic table.2. This inspection is to verify the condition of the drive belts. Damage may have occurred to the drive belts when thedrive belts fell off the pulley. Inspect the drive belts for cuts, tears, sections of ribs missing, or damaged belt plys.4. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of anaccessory drive component, or the pulley may be bent inward or outward from a previous repair. Test for a misalignedpulley using a straight edge in the pulley grooves across 2 or 3 pulleys. If a misaligned pulley is found, refer to thataccessory drive component for the proper removal and installation procedure of that pulley.5. Inspection of the accessory drive pulleys should include inspecting for bends, dents or other damage that wouldprevent the drive belt from seating properly in the pulley grooves or on the smooth surface of a pulley when the back side ofthe drive belts are used to drive the pulley.6. Accessory drive component brackets that are bent or cracked will also cause the drive belts to fall off.7. Inspection of the fasteners can eliminate the possibility that an incorrect bolt, nut, spacer, or washer was installed.Missing, loose, or incorrect fasteners may cause pulley misalignment from the accessory drive brackets moving under load.Overtightening the fasteners may cause misalignment of the accessory component brackets.51 of 272
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LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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