BMW Coupes and Sedans 1970-1988 Repair Guide

Water Pump

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REMOVAL & INSTALLATION



Except 3 Series, 524td and 528e Models
  1. Drain the cooling system and remove the radiator.
  2.  


CAUTION
When draining 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 the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the fan blade and any pulley attached to the water pump.
  2.  
  3. Remove the engine lifting hook that's in the way before removing any water pump retaining bolts.
  4.  
  5. Remove the retaining bolts securing the water pump to the engine.
  6.  
  7. Place a pan below the water pump to catch any coolant which may spill out when the pump is removed.
  8.  
  9. To remove the water pump, tap the water pump body with the palm of your hand to break the seal and remove from the engine.
  10.  
  11. If reinstalling the pump, clean any gasket material from the water pump. Purchase a new water pump gasket.
  12.  
  13. Clean any gasket material from the engine mating surface.
  14.  

To install:
  1. Position the water pump up to the engine with a the gasket placed between the pump and the engine. Secure the pump in place with the retaining bolts. Tighten the bolts in a crisscross pattern to 16-17 ft. lbs. 20-24 Nm).
  2.  
  3. Attach the pulley, belt and fan.
  4.  
  5. Tension the belt. Connect the negative battery cable. Fill and bleed the cooling system.
  6.  

3 Series Models

See Figures 1, 2, 3, 4, 5 and 6

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


CAUTION
When draining 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 the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the distributor cap and rotor. Remove the rotor adapter, the dust shield and the distributor housing.
  2.  



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Fig. Fig. 1: Loosen the bolts on the water pump pulley-once loosened, remove the V-belt



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Fig. Fig. 2: Remove the water pump pulley



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Fig. Fig. 3: Loosen and remove the water pump retainer bolts



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Fig. Fig. 4: With the water pump removed, you can easily see the attached tensioner



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Fig. Fig. 5: Compressing the timing tensioner spring



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Fig. Fig. 6: If reinstalling the water pump, clean all gasket material from the pump surface

  1. Remove the fan by removing the fan coupling nut. Remember the nut is left hand thread, therefore turn clockwise to remove.
  2.  
  3. Remove the belt and pulley.
  4.  
  5. Remove the rubber guard and distributor and or upper timing belt cover.
  6.  
  7. Compress the timing tensioner spring and clamp pin with the proper tool.
  8.  

Observe the installed position of the tensioner spring pin on the water pump housing for reinstallation purposes.

  1. Remove the water hoses.
  2.  
  3. Remove the 3 water pump bolts and remove the pump.
  4.  

To install:
  1. Clean the gasket surfaces and use a new gasket.
  2.  
  3. Install the water pump in position. Note the position of the tensioner spring pin. Tighten the grade M8 bolts to 16-17 ft. lbs. (20-24 Nm) and grade M6 bolts to 6-7 ft. lbs. (8-10 Nm).
  4.  
  5. Connect the hoses.
  6.  
  7. Release the tensioner from the holding pin. Install the upper timing cover. Install the pulley and tighten the bolts to 6-7 ft. lbs. (8-10 Nm). Install the belt and tighten.
  8.  
  9. Install the fan, distributor housing and dust shield. Tighten the rotor adapter to 39-47 ft. lbs. (55-65 Nm). Install the rotor, O-ring and cap.
  10.  
  11. Add coolant and bleed the cooling system. Connect the negative battery cable.
  12.  

528e Models
  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system.
  4.  


CAUTION
When draining 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 the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the fan. Remove the drive belt and the water pump pulley.
  2.  
  3. Remove the pump mounting bolts.
  4.  
  5. Screw 2 bolts into the tapered bores and press the water pump out of the cover uniformly.
  6.  

To install:
  1. Lubricate and install a new O-ring.
  2.  
  3. Install the water pump and tighten the bolts to 6.5 ft. lbs. (9 Nm).
  4.  
  5. Install the pulley and tighten the bolts to 6.5 ft. lbs. (9 Nm). Install the belt and fan.
  6.  
  7. Fill and bleed the cooling system.
  8.  
  9. Connect the negative battery terminal.
  10.  

524td Models
  1. Remove the fan cowl. Hold the fan pulley with the blade of a screwdriver and remove the nut which secured the fan in place, turning it clockwise because of the use of left hand threads. Drain the cooling system.
  2.  


CAUTION
When draining 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 the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the front engine cover. Unclamp and detach the water pump outlet hose at the pump.
  2.  
  3. Remove the water pump mounting bolts. Remove the pump, pushing the timing belt to one side for clearance.
  4.  

To install:
  1. Clean both surfaces of gasket material, and install a new gasket.
  2.  
  3. Install the water pump in the reverse order of the removal procedure. Tighten the bolts to 6.5 ft. lbs. (9 Nm). Refill the cooling system and bleed it.
  4.  

 
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