GM Full Size Vans 1967-1986 Repair Guide

Water Pump

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REMOVAL & INSTALLATION



Except 6.2L Diesel Engines

See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: Unfasten the fan retainers ...



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Fig. Fig. 2: ... then remove the fan



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Fig. Fig. 3: After removing the belt, remove the pulley



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Fig. Fig. 4: Unfasten the water pump retaining bolts



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Fig. Fig. 5: Remove the water pump from the vehicle

  1. Disconnect the battery.
  2.  
  3. Drain the radiator.
  4.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by 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. Loosen the alternator and other accessories at their adjusting points, and remove the fan belts from the fan pulley.
  2.  
  3. Remove the fan and pulley.
  4.  
  5. Remove any accessory brackets that might interfere with water pump removal.
  6.  
  7. Disconnect the hose from the water pump inlet and the heater hose from the nipple on the pump. Remove the bolts, pump assembly and old gasket from the timing chain cover.
  8.  
  9. Check the pump shaft bearings for end-play or roughness in operation. Water pump bearings usually emit a squealing sound with the engine running when the bearings need to be replaced. Replace the pump if the bearings are not in good shape or have been noisy.
  10.  
  11. To install, make sure the gasket surfaces on the pump and timing chain cover are clean. Install the pump assembly with a new gasket. Tighten the bolts uniformly.
  12.  
  13. The remainder of installation is the reverse of removal. Fill the cooling system and check for leaks at the pump and hose joints. Make sure all of the accessory belts are properly tensioned.
  14.  

6.2L Diesel Engine

See Figure 6



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Fig. Fig. 6: 6.2L diesel engine water pump assembly. Note the sealer application surface

  1. Disconnect the batteries.
  2.  
  3. Remove the fan and fan shroud.
  4.  
  5. Drain the radiator.
  6.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by 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 the truck is equipped with air conditioning, remove the A/C hose bracket nuts.
  2.  
  3. Remove the oil filler tube.
  4.  
  5. Remove the generator pivot bolt and remove the generator belt.
  6.  
  7. Remove the generator lower bracket.
  8.  
  9. Remove the power steering belt and secure it out of the way.
  10.  
  11. Remove the air conditioning belt if equipped.
  12.  
  13. Disconnect the by-pass hose and the lower radiator hose.
  14.  
  15. Remove the water pump bolts. Remove the water pump plate and gasket and water pump. If the pump gasket is to be replaced, remove the plate attaching bolts to the water pump and remove (and replace) the gasket.
  16.  
  17. When installing the pump, the flanges must be free of oil. Apply an anaerobic sealer (GM part #1052357 or equivalent) as shown in the accompanying illustration.
  18.  

The sealer must be wet to the touch when the bolts are torqued.

  1. Attach the water pump and plate assembly. Torque the bolts to specifications.
  2.  
  3. Assemble the remaining components in the reverse order of removal. Fill the cooling system, start the engine and check for leaks.
  4.  

 
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