Timing Chain & Sprockets: Removal
- Remove engine front cover as previously described. Remove fuel injection pump gear and camshaft gear. Align timing marks on camshaft and crankshaft sprockets. See Fig 1. Check timing chain and sprocket for wear before removing.
- Position dial indicator on front of cylinder block. Dial indicator tip must contact center of timing chain between timing sprockets. Pull chain outward and adjust dial indicator to zero.
- Push timing chain inward and note indicator reading. Timing chain deflection must not exceed .800" (20.32 mm) on used parts or .500" (12.70 mm) on new parts. Replace components as necessary. Remove camshaft and crankshaft sprocket and timing chain.
Courtesy of GENERAL MOTORS CORP.