Chrysler Full-Size Trucks 1967-1988 Repair Guide

Water Pump

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REMOVAL & INSTALLATION



6-198, 6-225 and 6-251 Engines

This job can sometimes be done without removing the radiator on models without air conditioning, but only if there is enough room to get at the water pump bolts.

  1. Remove the negative battery terminal.
  2.  
  3. Remove the radiator.
  4.  
  5. Remove all the accessary drive belts and any brackets in the way of the water pump.
  6.  
  7. If necessary, remove the alternator and/or power steering pump. In most cases, these items can be loosened and slid out of the way.
  8.  
  9. Remove the fan, spacer, pulley, and bolts as an assembly.
  10.  
  11. If equipped with an air pump, remove the pump brackets with the hoses attached and tie it out of the way.
  12.  
  13. Disconnect the heater hose and all other hoses from the pump.
  14.  
  15. Remove the pump from the block.
  16.  
  17. Clean all mating surfaces
  18.  

To install:
  1. Use a new gasket coated with sealer. Mount the pump to the block.
  2.  
  3. Torque the bolts to 30 ft. lbs. (41 Nm). Insert all hoses. Install the air pump.
  4.  
  5. If removed earlier, install the alternator and/or the power steering pump.
  6.  
  7. Attach the fan and pulley assembly. Install all belts.
  8.  
  9. Install the radiator and adjoining components.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Fill the cooling system and adjust the tension of the drive belts.
  14.  

8-318 and 8-360 Engines

See Figures 1 through 7

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system.
  4.  
  5. Remove the radiator.
  6.  
  7. Loosen all accessories that are belt driven and remove all the drive belts, as well as any brackets which could prevent the unit from being removed..
  8.  
  9. Remove the alternator bracket attaching bolts, then tie the alternator and bracket out of the way.
  10.  
  11. Loosen and remove the power steering pump retaining bolts. If necessary, remove the power steering pump to make the job easier, by unfastening the remaining pump bracket bolts. Place the pump out of the way, and strap down so it will not come free. The hoses attached to the pump DO NOT have to be removed.
  12.  



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Fig. Fig. 1: Because some of the alternator bracket bolts usually thread into the water pump, the alternator will have to be unbolted and supported aside



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Fig. Fig. 2: Loosen and remove the power steering pump bracket, and bolt. If necessary, the pump can be repositioned after unthreading the remaining bolt(s)

  1. On engines with air conditioning, remove the idler pulley assembly, alternator, and adjusting bracket.
  2.  
  3. Remove the fan blade, spacer (or fluid unit), pulley, and bolts as an assembly.
  4.  



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Fig. Fig. 3: To free the fan, remove the four bolts



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Fig. Fig. 4: After removing the blade, slide the pulley off the water pump

To prevent silicone fluid from draining into the drive bearing and ruining the lubricant, do not place the thermostatic fan drive unit with the shaft pointing downward.

  1. Disconnect all hoses from the water pump.
  2.  



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Fig. Fig. 5: Loosen the clamps and disconnect the hoses from the water pump

  1. Remove the air conditioning compressor front mounting bolts.
  2.  
  3. Remove the water pump-to-compressor front bracket bolts and the bracket.
  4.  

Do not disconnect any refrigerant lines from the compressor.

  1. Remove the water pump. Make sure to remove all traces of gasket material from the water pump and block.
  2.  



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Fig. Fig. 6: Make sure to clean all traces of old gasket with a scraper



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Fig. Fig. 7: It is very important to clean the mounting area well to prevent leaks when you install the pump

  1. Installation is the reverse of removal. Use a new gasket coated with sealer. Torque the bolts to 30 ft. lbs. (41 Nm). Fill the cooling system and adjust the tension of the drive belts.
  2.  

8-383, 8-400, 8-413 and 8-440 Engines
  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 to 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 all of the drive belts.
  2.  
  3. Remove the lower crankshaft pulley.
  4.  
  5. Remove the fan shroud screws and set the shroud back out of the way.
  6.  
  7. Remove the fluid fan drive bolts and set the fan assembly aside.
  8.  
  9. Remove the water pump and the gasket.
  10.  
  11. Installation is the reverse of removal. Use a new gasket coated with sealer. Torque the bolts to 30 ft. lbs. (41 Nm). Fill the cooling system and adjust the tension of the drive belts.
  12.  

Diesel Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system then remove the heater hoses and the bypass hose.
  4.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted to 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 mounting bolts and remove the belt.
  2.  
  3. Remove the cooling fan, the spacer and the drive pulley.
  4.  
  5. Remove the water pump mounting bolts and remove the pump.
  6.  
  7. Install the pump, use a new gasket coated with sealer. Torque the bolts to 30 ft. lbs. (41 Nm).
  8.  
  9. Install the cooling fan system.
  10.  
  11. Insert the alternator belt and retighten the bolts.
  12.  
  13. Connect the negative battery cable.
  14.  
  15. Fill the cooling system and adjust the tension of the drive belts.
  16.  

 
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