AMC Coupes/Sedans/Wagons 1975-1988 Repair Information

Water Pump

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REMOVAL & INSTALLATION



The water pump is a centrifugal unit having a non-adjustable packless seal. It is non-serviceable and must be replace of defective. No maintenance is required.

4-121 Engine

  1. Drain the cooling system. Disconnect the negative (-) cable from the battery. Remove the fan shroud.
  2.  


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

  1. Rotate the crankshaft until the camshaft and crankshaft are at Top Dead Center (TDC) for number one cylinder.
  2.  
  3. If equipped with power steering, loosen the pump and remove the belt. Loosen the air conditioner idler pulley and remove the belt, if so equipped.
  4.  
  5. Loosen the alternator and air pump.
  6.  
  7. Remove the fan, spacer, and pulley.
  8.  
  9. Remove the belt guard and air pump bracket.
  10.  
  11. Remove the camshaft and drive belt idler pulley.
  12.  
  13. Disconnect all the hoses from the pump except the hose from the thermostat.
  14.  
  15. Remove the water pump attaching bolts and pull the pump out of the hose from the thermostat.
  16.  

To install:
  1. Clean the gasket from the block, install a new gasket on the pump or block.
  2.  
  3. Insert the pump into the thermostat hose, install the pump attaching bolts and torque the small bolts to 7 ft.lb. and the large bolts to 16 ft.lb.
  4.  
  5. Connect all the hoses at the pump.
  6.  
  7. Install the camshaft and drive belt idler pulley.
  8.  
  9. Install the belt guard and air pump bracket.
  10.  
  11. Install the fan, spacer, and pulley.
  12.  
  13. If equipped with power steering, install the belt. Install the air conditioner belt, if so equipped.
  14.  
  15. Fill the cooling system. Connect the negative (-) battery cable.
  16.  
  17. Install the fan shroud.
  18.  
  19. Operate engine for 3 to 5 minutes with the heater on to check for leaks and correct fluid level.
  20.  

4-150 Engine See Figure 1

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Fig. Fig. 1: Water pump location and its retainers4-150 engine

Some 4-150 engines with air conditioning are equipped with a serpentine drive belt and have a reverse rotating water pump coupled with a viscous fan drive assembly. The components are identified by the words REVERSE stamped on the cover of the viscous drive and on the inner side of the fan. The word REV is also cast into the body of the water pump.

  1. Drain the cooling system.
  2.  


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

  1. Disconnect the hoses at the pump.
  2.  
  3. Remove the drive belts.
  4.  
  5. Remove the power steering pump bracket.
  6.  
  7. Remove the fan and shroud.
  8.  
  9. Unbolt and remove the pump.
  10.  

To install:
  1. Clean the mating surfaces thoroughly.
  2.  
  3. Using a new gasket, install the pump and torque the bolts to 13 ft.lb.
  4.  
  5. Install all other parts in reverse order of removal.
  6.  

4-151 Engine See Figure 2

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Fig. Fig. 2: Exploded view of the cooling system components4-150 engine

  1. Drain the cooling system.
  2.  


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

  1. Remove all drive belts.
  2.  
  3. Remove the fan and pump pulley.
  4.  
  5. Unbolt and remove the pump from the engine.
  6.  

To install:
  1. Clean the gasket surfaces, coat the new gasket with non-hardening type sealer and position the gasket on the block.
  2.  
  3. Coat the threaded areas of the bolts with waterproof sealer and install the pump. Torque the bolts to 25 ft. lbs.
  4.  
  5. Install the pulley and fan. Tighten the fan and hub bolts to 18 ft.lb.
  6.  
  7. Install the drive belts. The belts should be adjusted so that a 1 / 2 in. (12.7mm) deflection is present when they are depressed mid-point along their longest straight run.
  8.  

6-232 and 258 Engines See Figures 3 and 4

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Fig. Fig. 3: Early model cooling system components commonly found on 6-cylinder engines



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Fig. Fig. 4: Cooling system components used on late model 6-cylinder engines

  1. Drain the cooling system.
  2.  


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

  1. Disconnect all hoses at the pump.
  2.  
  3. Remove the drive belts.
  4.  
  5. Remove the fan shroud attaching screws.
  6.  
  7. Unbolt the fan and fan drive assembly and remove along with the shroud. On some models it may be easier to turn the shroud 1 / 2 turn.
  8.  
  9. Unbolt and remove the pump.
  10.  

Engines built for sale in California having a single, serpentine drive belt and viscous fan drive, have a reverse rotating pump and drive. These components are identified by the word REVERSE stamped on the drive cover and inner side of the fan, and REV cast into the water pump body. Never interchange standard rotating parts with these.

To install:
  1. Installation is the reverse of removal. Always use a new gasket coated with sealer. Torque the water pump bolts to 13 ft. lbs.; the fan bolts to 18 ft. lbs.
  2.  

8-304, 360 and 401 Engines See Figures 5 through 10

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Fig. Fig. 5: Exploded view of the cooling system components used on late model V8 engines



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Fig. Fig. 6: Typical cooling system components found on early model V8 engines



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Fig. Fig. 7: Unfasten the thermostat over bypass clamp ...



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Fig. Fig. 8: ... then disconnect the hose from the water pump



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Fig. Fig. 9: Unfasten the water pump retaining bolts ...



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Fig. Fig. 10: ... then remove the pump from the vehicle

  1. Drain the cooling system.
  2.  


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

  1. Disconnect all hoses at the pump.
  2.  
  3. Loosen all drive belts.
  4.  
  5. Remove the shroud, but reinsert one bolt to hold the radiator.
  6.  
  7. Remove the fan and hub.
  8.  
  9. If the vehicle is equipped with A/C install a double nut on the compressor bracket-to-water pump stud and remove the stud.
  10.  
  11. Remove, but do not disconnect the alternator and bracket.
  12.  
  13. If so equipped, remove the nuts that attach the power steering pump to the rear half of the pump bracket.
  14.  
  15. Remove the two bolts that attach the front half to the rear half of the bracket.
  16.  
  17. Remove the remaining upper screw from the inner air pump support bracket, loosen the lower bolt and drop the bracket away from the power steering front bracket.
  18.  
  19. Remove the front half of the power steering bracket from the water pump mounting stud.
  20.  
  21. Unbolt and remove the water pump.
  22.  

To install:
  1. Install the pump. Always use a new gasket coated with sealer. Torque the pump-to-timing case bolts to 48 in.lb. and the pump-to-blockbolts to 25 ft.lb.
  2.  
  3. Install the front half of the power steering bracket to the water pump mounting stud. Torque the power steering pulley nut to 60 ft.lb.
  4.  
  5. Install the upper screw from the inner air pump support bracket, and tighten the lower bolt.
  6.  
  7. If so equipped, install the nuts that attach the power steering pump to the rear half of the pump bracket.
  8.  
  9. Install the two bolts that attach the front half to the rear half of the bracket.
  10.  
  11. Install the alternator and bracket.
  12.  
  13. If the vehicle is equipped with A/C install a double nut on the compressor bracket-to-water pump stud and install the stud.
  14.  
  15. Install the fan and hub.
  16.  
  17. Install the shroud.
  18.  
  19. Adjust all drive belts.
  20.  
  21. Connect all hoses at the pump.
  22.  
  23. Fill the cooling system.
  24.  

 
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