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: 1412006 Y Car GMX245 Corvette7.0L (LS7) Engine Mechanical• Excessive valve stem-to-guide clearance may cause a noisy valve train, premature valve stem oil seal wear,component damage, and/or excessive engine oil consumption.• Insufficient valve stem-to-guide clearance will result in noisy or sticking valves. Valves that are too tight maydisturb engine smoothness or lead to component damage.1. Measure the valve stem-to-guide clearance using a dial indicator. Position the tip of the dial indicator at the topof the valve guide.Valve stem-to-guide clearance may also be obtained by using a micrometer to measure the valve stem diameterand a ball type measuring gage to measure the guide bore.1561722. If the stem (1) to guide (2) clearance exceeds specifications, replace the cylinder head. Refer to Engine MechanicalSpecifications .1561743. Inspect the valve stems for excessive scoring, wear, or warpage.• A valve stem that has excessive scoring (3 or 4) or wear (4 or 6) must be replaced.• A valve guide that is worn and has excessive stem-to-guide clearance should be reamed and valves withoversize stems installed.4. Measure the valve stem diameter. A valve stem with a diameter less than 7.95 mm (0.313 in) must be replaced.141 of 272