Valve Clearance: 1.6L

Disconnect negative battery cable. Remove rocker cover. Rotate crankshaft clockwise until alignment notch on crankshaft pulley is aligned with zero mark on timing belt cover. See Fig 1 .
Ensure rocker arms of cylinder No. 1 are off respective cam lobes of camshaft. If they are not, rotate crankshaft clockwise one revolution (360 degrees) until alignment notch on crankshaft pulley is aligned with zero mark on timing belt cover.
Using feeler gauge, measure clearance between camshaft and cam-riding face of rocker arm on valves No. 1, 2, 5 and 7. See Fig 2 . Adjust valve clearance if not within specification. See VALVE CLEARANCE SPECIFICATIONS table.
Adjust valves by loosening lock nut and turning adjusting screw until correct clearance is obtained. Hold adjusting screw while tightening lock nut to 13 ft. lbs. (17 N.m) and recheck clearance.
Rotate crankshaft clockwise one revolution (360 degrees). Measure clearance between camshaft and cam-riding face of rocker arm on valves No. 3, 4, 6 and 8. See Fig 2 . Adjust valve clearance if not within specification. See VALVE CLEARANCE SPECIFICATIONS table.
Adjust valves by loosening lock nut and turning adjusting screw until correct clearance is obtained. Hold adjusting screw while tightening lock nut to 13 ft. lbs. (17 N.m) and recheck clearance. To install remaining components, reverse removal procedure.

VALVE CLEARANCE SPECIFICATIONS

Fig 1: Locating Ignition Timing Mark (1.6L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying Valve Arrangement (1.6L)

Courtesy of GENERAL MOTORS CORP.