Timing Belt: Installation

Install crankshaft and camshaft sprockets (if removed). Tighten retaining bolt to specification. See TORQUE SPECIFICATIONS .
Ensure all timing marks are aligned. See Fig 2 . Install timing belt. If reusing old timing belt, ensure belt is installed in original rotating direction. Ensure marks on belt align with camshaft and crankshaft sprockets.

Fig 1: Exploded View Of Timing Belt & Components
Courtesy of GENERAL MOTORS CORP.

Fig 2: Aligning Timing Marks
Courtesy of GENERAL MOTORS CORP.
Loosen belt tensioner bolt to allow tension to be applied on timing belt. Rotate crankshaft clockwise 2 revolutions. Ensure all timing marks are aligned. Tighten timing belt idler pulley bolts to specification. See TORQUE SPECIFICATIONS .
Measure timing belt deflection halfway between camshaft and crankshaft sprockets. With 4.5 lbs. (2.0 kg) applied on timing belt, deflection should be .20-.24" (5-6 mm). If belt deflection is not within specification, repeat steps 3) and 4).
CAUTION: Ensure all timing marks are aligned once timing belt is adjusted.
To install remaining components, reverse removal procedure. Tighten bolts to specification. See TORQUE SPECIFICATIONS . Before installing valve cover, apply Sealant (1052942) at valve cover-to-cylinder head surfaces.