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Water Pump Replacement
 
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Pelican Technical Article:

Water Pump Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$250 to $500

Talent:

***

Tools:

E10 socket, T40, T30 Torx, large drain pan, floor jack, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Porsche 955 Cayenne GTS (2008-10)
Porsche 955 Cayenne S (2008-10)
Porsche 955 Cayenne Turbo (2008-10)
Porsche 955 Cayenne Turbo S (2009-10)
Porsche 970 Panamera 4S (2010-14)
Porsche 970 Panamera GTS (2013-14)
Porsche 970 Panamera S (2010-14)
Porsche 970 Panamera Turbo (2010-14)
Porsche 970 Panamera Turbo Executive (2014)
Porsche 970 Panamera Turbo S (2012-14)
Porsche 970 Panamera Turbo S Executive (2014)

Parts Required:

Water pump, gasket, 2 gallons of coolant, 2 gallons of distilled water

Hot Tip:

Make sure the mounting surface is clean

Performance Gain:

Proper engine cooling

Complementary Modification:

Coolant flush

Most water pump failures result in coolant pooling beneath the car, but another sign that the pump is going bad is you'll notice that the car tends to overheat at low engine speed, such as sitting at a stoplight. When you accelerate, the engine temperature will drop. Now, this is not always indicative of a water pump, but a good starting point. You may also want to try squeezing one of the top radiator hoses with the engine warmed up and running (use a glove and watch for heat). You should feel pressure build up on the back of the hose and surge once it is released. If you feel no pressure, it's a fair bet that the water pump is failing.

You are going to need to safely raise and support the vehicle and remove the under engine tray and engine covers. Please see our article on safely raising and supporting your Porsche Cayenne as well as removing the under engine tray and engine covers.

You should always give your cooling system a good flush when replacing the pump. If you have just recently flushed the system or do not have the time, this article will show you how to perform the job with a minimum of coolant lost. You will still need to fill and re-bleed the system when you are done.

The coolant pump is located in the front of the motor between the cylinder banks.
Figure 1

The coolant pump is located in the front of the motor between the cylinder banks. You will need to remove the engine covers, under trays along with the serpentine belt. Make sure to loosen the three T40 Torx screws on the water pump pulley (red arrow) before you remove the serpentine belts, as it is much easier to do while the pulley is under tension.

Open the cap on the coolant reservoir (red arrow) to break the vacuum in the coolant system.
Figure 2

Open the cap on the coolant reservoir (red arrow) to break the vacuum in the coolant system. Place a very large catch tray under the front of the motor.

Wiggle the pulley off the front of the pump (red arrow).
Figure 3

Wiggle the pulley off the front of the pump (red arrow). These can get corroded so take your time and make sure you do not damage the pulley.

There are five E10 bolts holding the pump to the front of the engine.
Figure 4

There are five E10 bolts holding the pump to the front of the engine. Make sure you use the correct socket (red arrow).

Here is a picture of the pump off the motor.
Figure 5

Here is a picture of the pump off the motor. Make sure to locate the E10 bolts that hold the pump in place (red arrows). There are several E10 bolts that also hold the timing cover on around the pump. You do not want to remove these and have coolant get into the timing cover.

Gently pull the pump from the front of the motor and be prepared for the coolant to come out quickly until it gets below the level of the pump.
Figure 6

Gently pull the pump from the front of the motor and be prepared for the coolant to come out quickly until it gets below the level of the pump. The coolant will splash off of the engine and components (red arrow) so make sure you have a large catch tray.

If you remove the pump from the engine bay by turning it in the opposite direction that it mounts, you can remove the old one and install the new one without removing any lines on the front of the motor (red arrow).
Figure 7

If you remove the pump from the engine bay by turning it in the opposite direction that it mounts, you can remove the old one and install the new one without removing any lines on the front of the motor (red arrow).

This photo illustrates the E10 timing cover bolts that you can confuse for the water pump so double check before removing the pump (red arrows).
Figure 8

This photo illustrates the E10 timing cover bolts that you can confuse for the water pump so double check before removing the pump (red arrows).

If your pump is still good and you are just removing it to get access to the thermostat, make sure to install a new gasket (red arrow) before reinstalling the old pump.
Figure 9

If your pump is still good and you are just removing it to get access to the thermostat, make sure to install a new gasket (red arrow) before reinstalling the old pump. Installation is the reverse of removal, and do not over Torx the bolts. You will need to add a little more than a gallon of both coolant and distilled water and bleed the system. Please see our article on coolant flush and bleeding for additional information.


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