GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Engine 🢒 Engine Mechanical - 3.0L (L46) 🢒 Engine Front Cover Replacement

Removal Procedure
  1. Disconnect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Drain the engine coolant from the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  3. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .
  4. Remove the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement in Engine Cooling.
  5. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement .
  6. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
  7. Remove the power steering pump with lines. Move the power steering pump aside. Refer to Power Steering Pump Replacement in Power Steering.
  8. Disconnect the thermostat bypass pipe from the engine front cover. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.
  9. Disconnect the radiator outlet hose from the coolant pump. Refer to Radiator Outlet Hose Replacement in Engine Cooling.
  10. Remove the drive belt idler pulleys. Refer to Drive Belt Idler Pulley Replacement .
  11. Remove the coolant pump pulley. Refer to Water Pump Replacement in Engine Cooling.

    12. Object Number: 190536 Size: SH
  12. Remove the lower crankshaft position sensor wiring harness bracket from the engine front cover. Refer to Crankshaft Position Sensor Replacement in Engine Controls - 3.0L.

    13. Object Number: 95865 Size: SH
  13. Remove the engine front cover bolts (1, 2 and 3).
  14. Remove the engine front cover.

    15. Object Number: 61818 Size: SH
  15. Remove the engine front cover gasket.
  16. Clean the engine front cover and engine block gasket sealing surfaces. Refer to Engine Front Cover Clean and Inspect .
  17. Inspect the engine front cover for damage to the engine front cover, crankshaft front oil seal or the gasket sealing surface. Refer to Engine Front Cover Clean and Inspect .
  18. Remove the drive belt shield.

    19. Object Number: 190537 Size: SH
  19. Remove the crankshaft position sensor from the engine front cover. Refer to Crankshaft Position Sensor Replacement in Engine Controls - 3.0L.
  20. Remove the coolant pump from the engine front cover. Refer to Water Pump Replacement in Engine Cooling.

Installation Procedure
  1. If removed, install the coolant pump to the engine front cover. Refer to Water Pump Replacement in Engine Cooling.

    2. Object Number: 190537 Size: SH
  2. Install the crankshaft position sensor to the engine front cover. Refer to Crankshaft Position Sensor Replacement in Engine Controls - 3.0L.
  3. Install the drive belt shield.

    4. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the drive belt shield bolt.

    5. Tighten
    Tighten the drive belt shield bolt to 10 N·m (89 lb in).


    Object Number: 61819 Size: SH
  5. Coat both sides of the lower tabs of the engine front cover gasket with sealant GM P/N 1052080 or equivalent.

    6. Object Number: 61818 Size: SH
  6. Install the engine front cover gasket.

    7. Object Number: 95865 Size: SH
  7. Install the engine front cover.

    8. Object Number: 190536 Size: SH
  8. Install the lower crankshaft position sensor wiring harness bracket to the engine front cover. Refer to Crankshaft Position Sensor Replacement in Engine Controls - 3.0L.
  9. Install the engine front cover bolts.

    10. Tighten

        • Tighten the five small engine front cover bolts (1) to 21 N·m (15 lb ft).
        • Tighten the three large engine front cover bolts (2) to 55 N·m (41 lb ft).
        • Tighten the two large engine front cover bolts (3) to 47 N·m (35 lb ft).
  10. Install the coolant pump pulley. Refer to Water Pump Replacement in Engine Cooling.
  11. Install the drive belt idler pulleys. Refer to Drive Belt Idler Pulley Replacement .
  12. Connect the radiator outlet hose to the coolant pump. Refer to Radiator Outlet Hose Replacement in Engine Cooling.
  13. Connect the thermostat bypass pipe to the engine front cover. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.
  14. Install the power steering pump with lines. Refer to Power Steering Pump Replacement in Power Steering.
  15. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
  16. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement .
  17. Fill the engine with new engine oil. Refer to Engine Oil and Oil Filter Replacement .
  18. Fill the cooling system with engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  19. Connect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.