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: 442006 Y Car GMX245 Corvette7.0L (LS7) Engine Mechanical1399775Drive Belt Chirping DiagnosisDrive Belt:Chirping Diagnosis:Engine Mechanical - 4.8L, 5.3L, and 6.0LDiagnostic AidsThe chirping noise may be intermittent due to moisture on the drive belts or the accessory drive pulleys. in order toduplicate the customer concern, It may be necessary to spray a small amount of water onto the drive belts. If sprayingwater on the drive belts duplicates the symptom, cleaning the accessory drive pulleys may be the most probable solution.A loose or improper installation of a body or suspension component, or other items on the vehicle may cause the chirpingnoise.Test DescriptionThe numbers below refer to the steps in the diagnostic table.2. The chirping noise may not be engine related. This step is to verify that the engine is making the noise. If theengine is not making the noise do not proceed further in this table.3. The noise may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, thiswill verify if the chirping noise is related to the drive belts or not. With the drive belts removed the water pump will notoperate and the engine may overheat. Also diagnostic trouble codes (DTCs) may set when the engine is operated withthe drive belts removed.4. Inspect the drive belts for signs of pilling. Pilling is the small balls, pills, or strings in the drive belt grooves causedby the accumulation of rubber dust.6. 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 for that pulley.10. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed.12. Inspection the accessory drive pulleys should include inspecting for bends, dents or other damage to the pulleysthat would prevent the drive belts from seating properly in the pulley grooves or on the smooth surface of a pulley whenthe back side of the drive belt is used to drive the pulley.14. Replacing the drive belts when it is not damaged or there is not excessive pilling will only be a temporary repair.Step Action Yes NoNotice: Refer to Belt Dressing Notice in Cautions and Notices.DEFINITION: The following items are indications of chirping:• A high pitched noise that is heard once per revolution of the drive belts or an accessory drive pulley.• Chirping may occur on cold damp startup conditions and will subside once the vehicle reaches normal operatingtemperature.1Did you review the Symptoms – Engine Mechanical diagnosticinformation, and perform the necessary inspections? Go to Step 2Go to Symptoms -Engine Mechanical2Verify that there is a chirping noise.Does the engine make the chirping noise? Go to Step 3 Go to Diagnostic Aids31. Remove the drive belt. 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 chirping noise still exist?Go to Engine Noiseon Start-Up, but OnlyLasting a Few Seconds, Upper EngineNoise, Regardlessof Engine Speed,orLower EngineNoise, Regardless ofEngine Speed Go to Step 444 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: 452006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalStep Action Yes No456789101112131415Inspect for severe drive belt pilling exceeding 1/3 of the drive beltgroove depth.Do the drive belt grooves have pilling? Go to Step 5 Go to Step 6Clean the accessory drive pulleys with a suitable wire brush.Were the accessory drive pulleys cleaned? Go to Step 14 —Inspect for a misaligned accessory drive pulleys.Isthereamisalignedaccessorydrivepulleys? Go to Step 7 Go to Step 8Replace and/or repair the misaligned accessory drive pulleys.Were the misaligned accessory drive pulleys replaced and/orrepaired? Go to Step 15 —Inspect for a bent or cracked accessory drive brackets.Did you find any bent or cracked accessory drive brackets? Go to Step 9 Go to Step 10Replace the bent and/or cracked accessory drive brackets.Was the bent and/or cracked accessory drive brackets replaced? Go to Step 15 —Inspect for incorrect, loose, and/or missing fasteners.Were there any incorrect, loose, and/or missing fasteners found? Go to Step 11 Go to Step 121. Replace any incorrect and/or missing fasteners.2. Tighten any loose fasteners. Refer to Fastener TighteningSpecifications .Were the fasteners replaced and/or tightened? Go to Step 15 —Inspect for a bent accessory drive pulleys.Was a bent accessory drive pulleys found? Go to Step 13 Go to Step 14Replace the bent accessory drive pulleys.Was the bent accessory drive pulleys replaced? Go to Step 15 —Replace the drive belts. Refer to Drive Belt Replacement -Accessory or Drive Belt Replacement - Air Conditioning .Was the drive belts replaced? Go to Step 15 —1. Clear any codes.2. Run the engine in order to verify the repair.Does the chirping noise still exist? Go to Step 3 System OKDiagnostic Information and Procedures1399794Drive Belt Squeal DiagnosisDrive Belt:Squeal Diagnosis:Engine Mechanical - 4.8L, 5.3L and 6.0LDiagnostic AidsA loose or improper installation of a body, or suspension component, or other items on the vehicle may cause the squealnoise.45 of 272
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