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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 784 (Engine Cooling System) >> Repair Instructions >> Water Pump Replacement (LNF) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Water Pump Bolts
    GM951802Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Prior to installing the water pump, read the entire procedure. This will help avoid balance shaft chain re-timing and ensure proper sealing.
  1. Install a NEW water pump O-ring seal.
    2. IMPORTANT: A guide pin can be created to aid in water pump alignment. Use a M 6 m x 6 mm stud. Thread the pin into the water pump sprocket.
  2. Using the guide pin, align the pin with the water pump holding tool.
  3. Position the water pump against the engine block and hand tighten the water pump bolts.
    4. NOTE: Refer to Fastener Notice .
  4. Install the inner water pump sprocket bolts. After two bolts are snug, remove the guide pin and install the 3rd bolt.

    Tighten:  Tighten the bolts to 25 N.m (18 lb ft).

  5. Tighten the water pump sprocket bolts last.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    6. Fig 2: View Of Special Tool J 43651
    GM1828010Courtesy of GENERAL MOTORS CORP.
  6. Remove the J 43651  (1).
    7. Fig 3: View Of Water Pump Access Plate At Front Cover
    GM896331Courtesy of GENERAL MOTORS CORP.
  7. Install the water pump access plate and bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    8. Fig 4: Identifying Radiator Outlet Pipe
    GM1769795Courtesy of GENERAL MOTORS CORP.
  8. Install the radiator outlet pipe to the rear of the water pump and the thermostat housing using new O rings.
  9. Install the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement (L61)  or Engine Coolant Thermostat Housing Replacement (LE5)  or Engine Coolant Thermostat Housing Replacement (LNF) .
  10. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  11. Refill the coolant system to specifications and inspect for leaks. Refer to Cooling System Draining and Filling (GE 47716 Fill)  or Cooling System Draining and Filling (Static Fill LE5, L61)  or Cooling System Draining and Filling (Static Fill LNF) .
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