OEM 2003 Chevrolet Express 3500 Timing Chain

2003 Chevrolet Express 3500 Parts Questions & Experts Answers

• Q: How to replace the timing chain and sprockets on 2003 Chevrolet Express 3500?

  A: First remove the Oil Pump then rotate the Crankshaft until Crankshaft and camshaft sprocket timing marks align before you begin working with the Timing Chain and sprockets. Deadline the Crankshaft turn after you remove the chain to avoid damaging piston assemblies or valves. Start by removing the camshaft sprocket bolts before you remove the camshaft sprocket and Timing Chain from the engine. To remove the Crankshaft sprocket professionals should use j 8433 pulley puller (J 8433), j 41816-2 Crankshaft end protector (J 41816-2), and j 41558 Crankshaft sprocket remover (J 41558). After sprocket removal they may need to remove the Crankshaft sprocket key. A thorough examination of the Timing Chain along with sprockets should occur before their installation. To reinsert the key, place it inside the Crankshaft keyway to a fully centered position. Place the Crankshaft sprocket onto the Crankshaft front while properly aligning the key of both parts. Use the j 41665 Crankshaft balancer and sprocket installer (J 41665) to fully position the sprocket against the flange. Align the Crankshaft sprocket using its rotational motion until you see the alignment mark at the 12 o'clock position while ensuring both the camshaft sprocket locating pin matches its hole and the sprocket teeth meet the Timing Chain. Begin by positioning the camshaft sprocket alignment mark directly at the 6 o'clock point before installing both sprocket and chain. Alignment of timing marks requires potential rotation of the camshaft or Crankshaft sprockets before installing camshaft sprocket bolts that must be torqued to 35 nm (26 ft. Lbs.). Finally, reinstall the Oil Pump.