Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Water Pump

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REMOVAL & INSTALLATION




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.

E-Series Engines

See Figure 1



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Fig. Fig. 1: Water pump removal-E-Series engines

  1. Drain the cooling system.
  2.  
  3. Remove the power steering drive belt and the power steering pump.
  4.  

When removing the power steering pump, do not disconnect the pressure hoses or drain the system.

  1. Remove the water pump/alternator drive belt.
  2.  
  3. Remove the alternator mounting bolts and move it aside.
  4.  
  5. Remove the water pump pulley, then the water pump and the gasket.
  6.  

To install:
  1. Using a putty knife, clean the gasket mounting surfaces.
  2.  
  3. Install the water pump on the engine, with a new gasket. Torque the water pump bolts evenly to 78-120 inch lbs. (9-13 Nm).
  4.  
  5. Install the water pump pulley, alternator and the power steering pump.
  6.  
  7. Adjust the drive belts and refill the cooling system. Start the engine and check for leaks.
  8.  

CA16DE and CA18DE Engines

See Figure 2



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Fig. Fig. 2: Water pump removal-CA16DE and CA18DE engines

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Loosen the bolts retaining the fan shroud to the radiator and remove the shroud.
  6.  
  7. Loosen the belt, then remove the fan and pulley from the water pump hub.
  8.  
  9. Remove the bolts retaining the pump and remove the pump together with the gasket from the front cover.
  10.  

To install:
  1. Remove all traces of gasket material and install the pump in the reverse order. Use a new gasket and sealer. Tighten the bolts uniformly and torque to 12-14 ft. lbs. (16-18 Nm).
  2.  
  3. Install the pulley and fan onto the water pump hub.
  4.  
  5. Install and adjust the drive belt and radiator shroud.
  6.  
  7. Connect the negative (-) battery cable.
  8.  
  9. Refill the cooling system and start the engine and check for leaks.
  10.  

The water pump cannot be disassembled and must be replaced as a unit. Be careful not to get coolant on the timing belt

CD17 (Diesel) Engine

See Figure 3



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Fig. Fig. 3: Water pump removal-1.7L diesel engine

  1. Disconnect the negative (-) battery cable. Drain the cooling system.
  2.  
  3. Remove the alternator and air conditioning compressor drive belts, if equipped.
  4.  
  5. Remove the front crankshaft pulley after first setting the No. 1 cylinder at TDC on the compression stroke.
  6.  
  7. Remove the front engine covers.
  8.  
  9. Remove the timing belt.
  10.  
  11. Loosen the mounting bolts and remove the water pump. Take note of the location and length of each bolt, as there are three different lengths.
  12.  

To install:
  1. Clean all gasket surfaces before reassembly. Install new gaskets, and install the pump. Torque the bolts, going around in several stages to 12-14 ft. lbs. (16-19 Nm).
  2.  
  3. Refer to Timing Belt Removal and Installation procedure for the CD17 engine later in this section, and install the timing belt and timing belt covers. Make sure to replace the timing belt if the pump has been leaking, as antifreeze will destroy timing belts.
  4.  
  5. The remaining steps of installation are the reverse of removal. Make sure there is adequate clearance between the hose clamp and the timing cover to avoid deforming the cover.
  6.  

The water pump cannot be disassembled and must be replaced as a unit. Inspect the timing belt for wear or damage and replace if necessary.

GA16i Engine
  1. Disconnect the negative (-) battery cable.
  2.  
  3. Drain the coolant from the radiator and cylinder block.
  4.  


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 the drive belts.
  2.  
  3. Unbolt the water pump pulley and the water pump attaching bolts.
  4.  
  5. Separate the water pump with the gasket, if installed, from the cylinder block.
  6.  
  7. Remove all gasket material or sealant from the water pump mating surfaces. All sealant must be removed from the groove in the water pump surface also.
  8.  

To install:
  1. Apply a continuous bead of high temperature liquid gasket to the water pump housing mating surface. The housing must be attached to the cylinder block within 5 minutes after the sealant is applied. After the pump housing is bolted to the block, wait at least 30 minutes for the sealant to cure before starting the engine.
  2.  
  3. Position the water pump (and gasket) onto the block and install the attaching bolts. Torque the small retaining bolts to about 60 inch lbs. (10 Nm) and large retaining bolts 12-14 ft. lbs. (16-20 Nm).
  4.  
  5. Install the water pump pulley.
  6.  
  7. Install the drive belts and adjust the tension.
  8.  
  9. Fill the cooling system to the proper level.
  10.  
  11. Connect the negative (-) battery cable.
  12.  

GA16DE Engine

See Figures 4, 5, 6 and 7



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



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Fig. Fig. 5: Removing the water pump



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Fig. Fig. 6: The thermostat housing is mounting to the water pump on the GA16DE engine



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Fig. Fig. 7: Apply RTV gasket sealer in a continuous bead around the water pump-GA16DE engine

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system.
  4.  


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 the cylinder head front mounting bracket.
  2.  
  3. Loosen the water pump pulley bolts.
  4.  
  5. Remove the engine drive belts from the A/C compressor, power steering pump and alternator.
  6.  
  7. Remove the belt pulley from the water pump.
  8.  
  9. Disconnect electrical connectors and coolant hoses from the thermostat housing.
  10.  
  11. Unbolt and remove the water pump and thermostat housing from the engine.
  12.  

Remove the thermostat housing with water pump assembly.

  1. Remove the bolts that secure the thermostat housing to the water pump.
  2.  
  3. Remove all traces of gasket material from sealing surfaces.
  4.  

To install:
  1. Apply a continuous bead of liquid sealer to the sealing surface of the thermostat housing. The sealant should be 0.079-0.118 in. (2-3mm) diameter.
  2.  
  3. Install the thermostat housing on the water pump and tighten mounting bolts to 56-73 inch lbs. (7-8 Nm).
  4.  
  5. Apply a continuous bead of liquid sealer to the sealing surface of the water pump. The sealant should be 0.079-0.118 in. (2-3mm) diameter.
  6.  
  7. Install the water pump on the engine and tighten mounting bolts to 56-73 inch lbs. (7-8 Nm).
  8.  
  9. Install the pulley on the water pump and tighten the mounting bolts to 56-73 inch lbs. (7-8 Nm).
  10.  
  11. Connect electrical connectors and coolant hoses to the thermostat housing.
  12.  
  13. Install and adjust the alternator, power steering and A/C compressor drive belts.
  14.  
  15. Refill the cooling system and connect the negative battery cable.
  16.  
  17. Start the engine, bleed the cooling system, warm the engine to full operating temperature, and check for leaks.
  18.  
  19. If necessary, refill the cooling system when the engine has cooled.
  20.  

SR20DE Engine

See Figures 8 and 9



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Fig. Fig. 8: Remove the cylinder drain plug located at the left front of the engine to drain block-SR20DE engine



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Fig. Fig. 9: Water pump assembly-SR20DE engine

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the radiator coolant.
  4.  


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 the cylinder block drain plug located at the left front of the engine and drain coolant.
  2.  
  3. Loosen the water pump pulley bolts.
  4.  
  5. Remove the power steering pump, alternator and A/C compressor drive belts (if equipped).
  6.  
  7. Remove the water pump pulley.
  8.  
  9. Note positioning of power steering pump adjusting bracket and remove the power steering pump adjusting bracket from the water pump. If necessary, remove the power steering pump for access to bracket.
  10.  

When removing the power steering pump, it is not necessary to disconnect the pressure hoses or drain the system. Position or tie the pump aside.

  1. Support the engine and remove the front engine mount.
  2.  
  3. Remove the mounting bolts from the water pump and remove the water pump.
  4.  
  5. Remove all traces of liquid gasket material from sealing surfaces.
  6.  

To install:
  1. Apply a continuous bead of liquid sealer to the mating surface of the water pump. Sealer should be 0.079-0.118 in. (2-3mm) wide.
  2.  
  3. Install the water pump assembly and tighten mounting bolts to 12-15 ft. lbs. (16-21 Nm).
  4.  

Be sure to properly position the adjusting bracket that was noted during removal.

  1. Install the front engine mount.
  2.  
  3. Install the power steering pump adjusting bracket and install the power steering pump if removed.
  4.  
  5. Install the water pump pulley and tighten mounting bolts to 55-73 inch lbs. (6-8 Nm).
  6.  
  7. Install and adjust the power steering pump, alternator and A/C compressor drive belts (if equipped).
  8.  
  9. Install the cylinder block drain plug located at the left front of the engine and tighten drain plug to 70-104 inch lbs. (8-12 Nm).
  10.  
  11. Refill the cooling system and connect the negative battery cable.
  12.  
  13. Start the engine, bleed the cooling system, and check for leaks.
  14.  

 
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