Timing Belt: Installation

Install crankshaft and camshaft sprockets (if removed). Tighten retaining bolt to specification. See TORQUE SPECIFICATIONS TABLE at the end of this article.
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 TABLE at the end of this article.
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 TABLE at the end of this article. Before installing valve cover, apply Sealant (1052942) at valve cover-to-cylinder head surfaces.