GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Astro - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Camshaft Replacement

Removal Procedure
  1. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls-4.3L.
  3. Remove the radiator. Refer to Radiator Replacement in Engine Cooling.
  4. Remove the A/C condenser. Refer to Condenser Replacement in Heating, Ventilation and Air Conditioning.
  5. Remove the radiator grille. Refer to Grille Replacement in Body Front End.
  6. Remove the valve lifters. Refer to Valve Lifter Replacement .

    7. Object Number: 9847 Size: SH
  7. Remove the timing chain and the camshaft sprocket. Refer to Timing Chain and Sprocket Replacement .
  8. Remove the balance shaft drive gear.
  9. Remove the camshaft. Refer to Camshaft Removal .
  10. Clean and inspect the camshaft and the bearings. Refer to Camshaft and Bearings Cleaning and Inspection .

Installation Procedure

    Important: Whenever a new camshaft is installed, do the following procedures:

       • Change the engine oil.
       • Change the engine oil filter.
       • Add GM Engine Oil Supplement GM P/N 1052367 (Canadian P/N 992869) or the equivalent to the engine oil.

  1. Install the camshaft into the engine block. Refer to Camshaft Installation .
  2. Install the balance shaft drive gear. Refer to Balance Shaft Installation for alignment of the balance shaft drive gear and the driven gear.
  3. Install the timing chain and camshaft sprocket. Refer to Timing Chain and Sprocket Replacement .
  4. Install the valve lifters. Refer to Valve Lifter Replacement .
  5. Install the A/C condenser. Refer to Condenser Replacement in Heating, Ventilation and Air Conditioning.
  6. Install the radiator grille. Refer to Grille Replacement in Body Front End.
  7. Install the radiator. Refer to Radiator Replacement in Engine Cooling.
  8. Fill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  9. Recharge the air conditioning system. Refer to Refrigerant Recovery and Recharging in Heating, Ventilation and Air Conditioning.
  10. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls-4.3L.
  11. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.