Timing Chain & Sprockets: Installation

If engine has been rotated, rotate crankshaft so No. 1 cylinder is at TDC. Temporarily install camshaft sprocket. Rotate camshaft sprocket so timing mark is downward.
Remove camshaft sprocket and install timing chain on camshaft sprocket. Install timing chain and camshaft sprocket. Ensure timing marks are aligned. See Figure. Install camshaft sprocket bolts. Install camshaft button and spring.
To install remaining components, reverse removal procedure. Ensure timing marks are aligned.

Fig 1: Front Timing Case Cover

Courtesy of GENERAL MOTORS CORP.