Silverado 2008

Removal & Installation

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4.3L Engines



Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the radiator. Properly dispose of used coolant.
  6.  
  7. Remove the air cleaner assembly.
  8.  
  9. Remove the air cleaner outlet resonator duct.
  10.  
  11. Remove the cooling fan.
  12.  
  13. Remove the drive belt.
  14.  
  15. Reposition the radiator outlet hose clamps at the surge tank and water pump.
  16.  
  17. Remove the outlet hose from the serge tank. Remove the hose from the water pump.
  18.  
  19. Reposition the water pump inlet hose clamps. Remove the inlet hose.
  20.  
  21. Using tool J-412240 or equivalent, to hold the water pump pulley. Remove the water pump pulley retaining bolts.
  22.  
  23. Remove the water pump retaining bolts. Remove the water pump from the engine.

    Click image to see an enlarged view

    Fig. Water pump and related components-4.3L engines

  24.  

To install:


NOTE
Be sure to use new fasteners, as required.

  1. If reusing the old fasteners, apply GM 12346004 sealant or equivalent to the threads of the water pump bolts.
  2.  
  3. Clean all old gasket material from all mating surfaces.
  4.  
  5. Install or connect the following:

    Pump assembly with a new gasket. Torque the bolts to 33 ft. lbs. (45 Nm).
     
    Water pump pulley bolts. Tighten to 18 ft. lbs. (25 Nm).
     
    Hose between the water pump inlet and the pump
     
    Fan, fan clutch and pulley
     
    Alternator and other accessories, if necessary
     
    Drive belt(s)
     
    Upper radiator shroud
     

  6.  
  7. Refill the cooling system.
  8.  
  9. Connect the battery.
  10.  

4.8L, 5.3L & 6.0L Engines



Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove or disconnect the following:

    Air outlet duct
     
    Coolant
     
    Inlet radiator hose from the water pump
     
    Upper fan shroud
     
    Cooling fan and clutch assembly
     
    Drive belt
     
    Radiator outlet hose from the coolant pump
     
    Surge tank hose
     
    Heater hose
     
    Water pump

    Click image to see an enlarged view

    Fig. View of the water pump (300), mounting bolts (301) and gaskets (306)-4.8L, 5.3L & 6.0L engines

     

  6.  

To install:


NOTE
DO NOT use cooling system seal tabs (or similar compounds) unless otherwise instructed. The use of cooling system seal tabs (or similar compounds) may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

  1. Install or connect the following:

    Water pump. Install the water pump bolts. Tighten the water pump bolts first pass to 11 ft. lbs. (15 Nm); tighten the bolts final pass to 22 ft. lbs. (30 Nm).
     
    Water pump drive belt pulley and bolts (if applicable). Tighten the pulley bolts first pass to 89 inch lbs. (10 Nm); tighten the bolts final pass to 18 ft. lbs. (25 Nm).
     
    Surge tank hose
     
    Heater hose
     
    Outlet radiator hose to the coolant pump
     
    Drive belt
     
    Cooling fan and clutch assembly
     
    Upper fan shroud
     
    Inlet radiator hose to the water pump
     
    Air inlet duct
     
    Coolant
     

  2.  

 
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