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BMW E39 Cooling Pump Removal
 
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Pelican Technical Article:

BMW E39 Cooling Pump Removal

Kerry Jonsson

Time:

5 hours5 hrs

Tab:

$200

Talent:

*****

Tools:

10mm wrench or socket with ratchet, small thin pick or diagonal cutting pliers, flat head screwdriver

Applicable Models:

BMW 525i Sedan/Wagon (2001-03)
BMW 528i Sedan/Wagon (1997-00)
BMW 530i Sedan (2001-03)
BMW 540i Sedan/Wagon (1997-03)

Parts Required:

drive belts, coolant pump pulley, possible crankshaft pulley

Hot Tip:

Keep drain pan under engine since more coolant will come out.

Performance Gain:

Stop coolant leak, replace failed pump, impeller, bearing

Complementary Modification:

Replace thermostat with new coolant pump

The job of your water pump is to take the torque from the crankshaft through the drive belt to spin an impeller in the cooling system. This action causes coolant flow. Coolant cooled by the radiator is passed through your engine to remove the heat generated by the combustion process. If your coolant pump fails it will not pump as much coolant as designed and allow heat to build up in the engine. The pump can also leak and the bearing on the water pump may fail allowing the cooling fan to wobble around as the engine spins. In this tech article we will go over all the steps to remove and service your water pump.

In order to service your water pump you will need to remove the mechanical cooling fan, shroud, accessory drive belt and coolant pump pulley. See our tech articles on these procedures and then follow the steps outlined here. You can drain the coolant system down to the level below the coolant pump and place a large catch pan under the engine as more coolant will escape while preforming this job. Always dispose of coolant according to your local regulations. Please see our article on draining and flushing your cooling system.

Water Pump Removal Eight Cylinder Engine:
With the mechanical cooling fan and drive belt out of the way remove the four 10mm fasteners (green arrows) that hold the water pump pulley to the water pump flange.
Figure 1

With the mechanical cooling fan and drive belt out of the way remove the four 10mm fasteners (green arrows) that hold the water pump pulley to the water pump flange. You can use a strap wrench or large channel lock pliers to hold the pulley still while you loosen the bolts.

Use a flat head screwdriver to loosen the clamp on the water pump for the upper radiator hose and remove the hose.
Figure 2

Use a flat head screwdriver to loosen the clamp on the water pump for the upper radiator hose and remove the hose. Twist the hose first before trying to pull the hose off of the water pump.

With a small flat head screwdriver loosen the clamp on the small coolant hose and remove the hose on the passenger side of the water pump.
Figure 3

With a small flat head screwdriver loosen the clamp on the small coolant hose and remove the hose on the passenger side of the water pump.

As an example we have a later model radiator hose.
Figure 4

As an example we have a later model radiator hose. If you have the later model cooling system hoses use a flat head screwdriver lever up on the coolant hose retaining clip.

Another example is the upper radiator hose on this Z4 with the 4 cylinder slide the retaining clip until it hits the stop on the hose.
Figure 5

Another example is the upper radiator hose on this Z4 with the 4 cylinder slide the retaining clip until it hits the stop on the hose. You can now pull on the hose off of the water pump by twisting it first followed by pulling it off.

Unplug the electrical connection for the coolant sensor by squeezing the connector and pulling straight up in the direction of the blue arrow.
Figure 6

Unplug the electrical connection for the coolant sensor by squeezing the connector and pulling straight up in the direction of the blue arrow.

Remove the three 10mm fasteners (green arrows) that mount the driver side of the water pump to the block.
Figure 7

Remove the three 10mm fasteners (green arrows) that mount the driver side of the water pump to the block.

Remove the two 10mm fasteners (green arrows) that mount the passenger side of the water pump to the block.
Figure 8

Remove the two 10mm fasteners (green arrows) that mount the passenger side of the water pump to the block.

Remove the final 10mm bolt with a wrench mounted behind the crankshaft pulley.
Figure 9

Remove the final 10mm bolt with a wrench mounted behind the crankshaft pulley.

If you cannot get to the bolt behind the crankshaft pulley you will have to remove the pulley.
Figure 10

If you cannot get to the bolt behind the crankshaft pulley you will have to remove the pulley. This is a close up view of the center of the crankshaft pulley. Remove the eight 10mm fasteners (green arrows) that mount the pulley onto the crankshaft. You can then remove the crank pulley by tapping it off with a mallet.

Hold the two coolant pipes in the same position while pulling off the water pump.
Figure 11

Hold the two coolant pipes in the same position while pulling off the water pump. The cooling pipes run underneath the intake manifold and attach to the coolant housing at the back of the motor and will require some additional work to install if they come out.

With all the fasteners removed pull the water pump away from the block and remove it.
Figure 12

With all the fasteners removed pull the water pump away from the block and remove it. You may want to remove the the ASC cable. See our tech article on removing the throttle body to remove the ASC cable.

Note the position of the bolts as you remove them.
Figure 13

Note the position of the bolts as you remove them. Two of them are longer than the other four and must go back in the same position. Installation is the reverse of the removal steps. Clean the gasket surfaces of the block and apply a small amount of sealant to both sides of the water pump gasket. Mount the water pump and tighten the fasteners. Fit the two coolant hoses and tighten the clamps. Mount the pulley and tighten the fasteners. Plug in the coolant temperature sensor and mount any components that you have removed to gain access to the coolant pump. Bleed the cooling system according to our tech article on draining, filling and bleeding the cooling system.

Water Pump Removal Six Cylinder Engine:
Before removing engine drive belt, loosen the four 10mm water pump pulley fasteners, but do not remove yet the pulley.
Figure 14

Before removing engine drive belt, loosen the four 10mm water pump pulley fasteners, but do not remove yet the pulley. Remove engine drive belt. See our tech article on engine drive belt on replacing.

Now you can remove the four 10mm water pump pulley fasteners.
Figure 15

Now you can remove the four 10mm water pump pulley fasteners. (green arrows)

Next, remove water pump pulley from water pump.
Figure 16

Next, remove water pump pulley from water pump. While the pulley is off, inspect it for small cracks or damage. The pulleys can fail, although not that often. Usually when we least expect it.

Remove four 10mm water pump mounting nuts.
Figure 17

Remove four 10mm water pump mounting nuts. (green arrows)

The water pump sits deep in the timing cover and it can be tough to get the sealing O-ring to pass through.
Figure 18

The water pump sits deep in the timing cover and it can be tough to get the sealing O-ring to pass through. There are two threaded holes you can install M6 bolts in to extract water pump. (green arrows)

To remove water pump from timing cover, thread two M6 bolts into sides of water pump.
Figure 19

To remove water pump from timing cover, thread two M6 bolts into sides of water pump. (green arrows)

Use a ratchet to evenly tighten, a few turns per side, then switch and tighten opposite side, repeat until water pump O-ring has cleared timing cover.
Figure 20

Use a ratchet to evenly tighten, a few turns per side, then switch and tighten opposite side, repeat until water pump O-ring has cleared timing cover. (green arrows)

Once water pump O-ring has cleared timing cover, you can remove it by hand.
Figure 21

Once water pump O-ring has cleared timing cover, you can remove it by hand. Before installing new water pump, thoroughly clean water pump mounting surface and check for debris inside water pump cavity, (inside timing cover). Lubricate water pump O-ring with coolant and install in engine. Hand tighten the fasteners in a crisscross pattern slowly. Tighten one a few turns, then the next and so on. The water pump will slowly draw into the engine. Be careful not to work too quickly, you could strip the stud threads. Install water pump pulley and tighten pulley fasteners. Install engine drive belt, cooling fan shroud, and fill and bleed cooling system. Once complete, check cooling system for leaks and top up cooling system.

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Page last updated: Wed 12/7/2016 02:04:48 AM