Disassembly & Inspection
- To disassemble intake camshaft, insert pins "A" and "B" in sub-gear holes. See Fig 1
. Using screwdriver, rotate sub-gear clockwise and remove pin "C". Remove snap ring, wave washer, sub-gear and gear spring. See Fig 2
.
- Inspect components for damage. Measure camshaft journal diameter, lobe height, and journal runout. Replace camshaft if measurements are not within specification. See CAMSHAFT table under ENGINE SPECIFICATIONS at end of article.
- Install camshaft in cylinder head. Using Plastigage, check camshaft oil clearance. Tighten camshaft bearing cap bolts to specification when checking oil clearance. See TORQUE SPECIFICATIONS table at end of article. Replace camshaft and/or cylinder head if oil clearance is not within specification. See CAMSHAFT table.
- Check camshaft end play with camshaft bearing cap bolts tightened to specification. Replace camshaft and/or cylinder head if end play is not within specification. See CAMSHAFT table.
- Install camshafts without sub-gear. Use a dial indicator to check gear backlash between camshaft gears. Replace camshaft if backlash exceeds specification. See CAMSHAFT table.
- Measure distance between ends of gear spring. Replace gear spring if distance is not .673-.689" (17.09-17.50 mm).
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.