Chevrolet Full Size Cars 1979-1989

Water Pump

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The water pump is a die cast, centrifugal-type with sealed bearings. Since it is pressed together, it must be serviced as a unit.

REMOVAL & INSTALLATION





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Fig. Fig. 1 If the belts are to be removed completely from the engine, be sure to label them



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Fig. Fig. 2 Loosen the fan retainers



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Fig. Fig. 3 With the retainers removed the fan is free to be removed from the pulley



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Fig. Fig. 4 Remove the pulley from the water pump hub



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Fig. Fig. 5 Remove any accessory brackets which may be mounted to the water pump studs



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Fig. Fig. 6 In some cases, the studs must then be removed in order to disconnect another bracket



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Fig. Fig. 7 Loosen the water pump hose retaining clamps



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Fig. Fig. 8 Pull the hoses from the water pump



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Fig. Fig. 9 Make sure all of the bolts are removed, then gently pry the water pump to loosen it



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Fig. Fig. 10 Remove the water pump from the engine

Except Diesel and Oldsmobile Produced 307 V8 Engine
  1. Disconnect the negative battery cable and drain the cooling system.
  2.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. If necessary for access, remove the fan shroud and/or the upper radiator support.
  2.  
  3. Loosen and remove the necessary drive belts.
  4.  
  5. Remove the fan and water pump pulley.
  6.  
  7. Remove the alternator and, if equipped, the power steering pump brackets as necessary and reposition the components for access to the water pump.
  8.  
  9. Remove the heater hose and the lower radiator hose from the pump.
  10.  
  11. Support the water pump and remove the retaining bolts, then remove the pump from the block. Because the water pump is held by bolts of various lengths, the bolt positions should be noted during removal.
  12.  

To install:

  1. Be sure to remove all traces of gasket or sealer material from the gasket mating surfaces.
  2.  
  3. Position the pump to the block using new gaskets. The gaskets may be held in place using small amount of RTV sealer or bolts may be held through the pump mounting holes in order to correctly position the gaskets.
  4.  

Use an anti-seize compound on the water pump bolt threads.

  1. Install all of the water pump bolts and torque to 30 ft. lbs. (41 Nm).
  2.  
  3. Connect the heater hose and the lower radiator hose to the pump.
  4.  
  5. As applicable, reposition and secure the alternator and/or power steering pump.
  6.  
  7. Install the water pump pulley and the cooling fan.
  8.  
  9. Install and adjust the drive belts.
  10.  
  11. If removed, install the fan shroud and/or the upper radiator support.
  12.  
  13. Connect the negative battery cable, then properly refill the engine cooling system.
  14.  
  15. Start and run the engine, then check for leaks.
  16.  

Diesel and Oldsmobile 307 V8 Engines


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Fig. Fig. 11 Water pump and front cover installation diesel engine

  1. Disconnect the negative battery cable and drain the engine cooling system.
  2.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Disconnect the lower radiator hose, heater hose and the by-pass hose from the water pump.
  2.  
  3. Remove the cooling fan assembly, the drive belts and the water pump pulley.
  4.  
  5. Remove the alternator, the power steering pump and the air conditioning compressor (if equipped) brackets, then position the components aside with their lines intact.
  6.  
  7. Support the water pump and remove the mounting bolts, then remove the pump from the block. For diesel engines, the water pump and front cover are usually removed as an assembly. For the 307 V8 Oldsmobile engine, the water pump may separate from the front cover, check for seams before attempting to separate.
  8.  

To install:

  1. Be sure to remove all traces of gasket or sealer material from the gasket mating surfaces.
  2.  
  3. Position the pump to the block using new gaskets. The gaskets may be held in place using small amount of RTV sealer or bolts may be held through the pump mounting holes in order to correctly position the gaskets.
  4.  

Apply sealer to the lower water pump bolts.

  1. Install the water pump bolts and tighten to specification:
  2.  
    1. For the diesel engine, tighten the pump-to-front cover bolts (upper) to 22 ft. lbs. (30 Nm) and the front cover-to-engine bolts (lower) to 35 ft. lbs. (47 Nm).
    2.  
    3. For the Oldsmobile 307 V8 engine, tighten the pump-to-front cover bolts to 10 ft. lbs. (14 Nm) and the pump-to-block bolts to 22 ft. lbs. (30 Nm).
    4.  

  3. Reposition and secure the A/C compressor, power steering pump and/or alternator and bracket(s).
  4.  
  5. Install the water pump pulley, the cooling fan assembly and the drive belt.
  6.  
  7. Adjust the drive belt tension.
  8.  
  9. Connect the lower radiator hose, heater hose and the by-pass hose to the water pump.
  10.  
  11. Connect the negative battery cable and properly refill the engine cooling system.
  12.  
  13. Start and run the engine, then check for leaks.
  14.  

 
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