LS7 Corvette Mechanical Repair Specs (PDF) - Bakes Online

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: 372006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalCauseCracked cylinder liner or engine blockCylinder head or engine block porosityCorrectionReplace the components, as required.Replace the components, as required.Diagnostic Information and Procedures1555024Coolant in Engine OilCauseCorrectionDEFINITION: Foamy or discolored oil may indicate coolant entering the engine crankcase. Low coolant levels, an inoperativecooling fan, or a faulty thermostat may lead to an overtemperature condition which may cause engine component damage.Contaminated engine oil and oil filter should be changed.1. Inspect the oil for excessive foaming. Oil diluted by coolant may not properly lubricate the crankshaft bearings and maylead to component damage. Refer to Lower Engine Noise, Regardless of Engine Speed .2. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the cooling system mayindicate a faulty cylinder head gasket or damaged component.3. Inspect by performing a cylinder compression test. 2 cylinders side-by-side on the engine block with low compressionmay indicate a failed cylinder head gasket. Refer to Engine Compression Test .Faulty cylinder head gasketWarped cylinder headCracked cylinder headCracked cylinder liner or engine blockCylinder head, block, or manifold porosityReplace the head gasket and components, as required. Referto Cylinder Head Cleaning and Inspection and Cylinder HeadReplacement - Left Side or Cylinder Head Replacement -Right Side .Machine the cylinder head to proper flatness, if applicable,and replace the cylinder head gasket. Refer to Cylinder HeadCleaning and Inspection .Replace the cylinder head and gasket.Replace the components, as required.Replace the components, as required.Diagnostic Information and Procedures1406807Engine Compression TestEngine Compression Test:Engine Mechanical - 4.8L, 5.3L, and 6.0L1. Charge the battery if the battery is not fully charged.2. Disable the ignition system.3. Disable the fuel injection system.4. Remove all spark plugs.5. Turn the ignition to the ON position.6. Depress the accelerator pedal to position the throttle plate wide open.7. Start with the compression gage at zero and crank the engine through 4 compression strokes, 4 puffs.8. Measure the compression for each cylinder. Record the readings.9. If a cylinder has low compression, inject approximately 15 ml (1 tablespoon) of engine oil into the combustionchamber through the spark plug hole. Measure the compression again and record the reading.10. The minimum compression in any 1 cylinder should not be less than 70 percent of the highest cylinder. No cylindershould read less than 690 kPa (100 psi). For example, if the highest pressure in any 1 cylinder is 1 035 kPa (150 psi), thelowest allowable pressure for any other cylinder would be 725 kPa (105 psi). (1 035 x 70% = 725) (150 x 70% = 105).• Normal — Compression builds up quickly and evenly to the specified compression for each cylinder.37 of 272