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: 392006 Y Car GMX245 Corvette7.0L (LS7) Engine Mechanical• Cracked or damaged engine blockCaution: Refer to Battery Disconnect Caution .1. Disconnect the battery ground negative cable.2. Remove the spark plugs. Refer to Spark Plug Replacement .3.stroke.Rotate the crankshaft to place the piston in the cylinder being tested at top dead center (TDC) of the compression4. Install the J 35667-A , or equivalent.Important: It may be necessary to hold the crankshaft balancer bolt to prevent the crankshaft from rotating.5. Apply shop air pressure to the J 35667-A and adjust according to the manufacturers instructions.6. Record the cylinder leakage value. Cylinder leakage that exceeds 25 percent is considered excessive and mayrequire component service. In excessive leakage situations, inspect for the following conditions:• Air leakage noise at the throttle body or air inlet hose that may indicate a worn or burnt intake valve or abroken valve spring.• Air leakage noise at the exhaust system tailpipe that may indicate a worn or burnt exhaust valve or a brokenvalve spring.• Air leakage noise from the crankcase, oil level indicator tube, or oil fill tube that may indicate worn piston rings,a damaged piston, a worn or scored cylinder bore, a damaged engine block or a damaged cylinder head.• Air bubbles in the cooling system may indicate a damaged cylinder head or a damaged cylinder head gasket.7. Perform the leakage test on the remaining cylinders and record the values.Diagnostic Information and Procedures1409149Oil Consumption DiagnosisOil Consumption Diagnosis:Engine Mechanical - 4.8L, 5.3L, and 6.0LChecksCausesExcessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3 200 kilometers (2,000 miles).PreliminaryThe causes of excessive oil consumption may include the following conditions:• External oil leaksRefer to Oil Leak Diagnosis .• Incorrect oil level or improper reading of the oil level indicatorWith the vehicle on a level surface, run the engine for a few minutes, allowadequate drain down time, 2–3 minutes, and check for the correct engine oil level.• Improper oil viscosityRefer to the vehicle owners manual and use the recommended SAE grade andviscosity for the prevailing temperatures.• Continuous high speed driving and/or severe usage• Crankcase ventilation system restrictions or malfunctioning components• Worn valve guides and/or valve stems• Worn or improperly installed valve stem oil seals• Piston rings broken, worn, or not seated properlyAllow adequate time for the rings to seat.Replace worn piston rings as necessary.• Piston and rings improperly installed or not fitted to the cylinder boreDiagnostic Information and Procedures1555026Oil Pressure Diagnosis and TestingOil Pressure:Diagnosis and Testing:Engine Mechanical - 4.8L, 5.3L, and 6.0L39 of 272