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: 312006 Y Car GMX245 Corvette7.0L (LS7) Engine MechanicalCauseWorn piston ringsOil consumption may or may not cause the engine to misfire.Correction• Inspect the spark plugs for oil deposits. Refer to SparkPlug Inspection .• Inspect the cylinders for a loss of compression. Referto Engine Compression Test .• Perform cylinder leak down and compression testing todetermine the cause. Refer to Cylinder Leakage Test .• Repair or replace, as required.Worn crankshaft thrust bearingsSeverely worn thrust surfaces on the crankshaft and/or thrustbearing may permit fore and aft movement of the crankshaftand create a DTC without an actual misfire condition.Diagnostic Information and ProceduresReplace the crankshaft and bearings, as required.1555011Base Engine Misfire with Abnormal Valve Train NoiseBase Engine Misfire with:Abnormal Valve Train Noise:Engine Mechanical - 4.8L, 5.3L, and 6.0LCauseWorn or loose rocker armsThe rocker arm bearing end caps and/or needle bearingsshould be intact within the rocker arm assembly.Worn or bent valve pushrodsStuck valvesCarbon buildup on the valve stem can cause the valve not toclose properly.Excessively worn or mis-aligned timing chainWorn camshaft lobesCorrectionReplace the valve rocker arms, as required.• Replace the pushrods.• Inspect the top of the pistons for valve contact. If thetop of the piston shows valve contact, replace the piston andpin assembly.Repair or replace, as required.Replace the timing chain and sprockets, as required.Replace the camshaft and valve lifters.Sticking liftersDiagnostic Information and ProceduresReplace, as required.1555012Base Engine Misfire with Coolant ConsumptionBase Engine Misfire with:Coolant Consumption:Engine Mechanical - 4.8L, 5.3L, and 6.0L31 of 272