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Vacuum Pump Replacement
 
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Pelican Technical Article:

Vacuum Pump Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$150

Talent:

***

Tools:

E10 socket, small flexible socket

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:

Vacuum pump

Hot Tip:

Do not drop the bolts

Performance Gain:

Proper vacuum system

Complementary Modification:

Check brake pads

The vacuum pump on the Porsche Cayenne generates the vacuum pressure used in the brake, variable intake and evaporative leak detection pump. These pumps do wear out on a fairly regularly basis. One of the signs you want to watch out for is an external oil leak or the pump starts pumping oil into the system. If your brakes are starting to fade the vacuum pump should also be on the list of things to check.

While I have heard of people who claim to have changed the pump out while the intake manifold is still on the motor I recommend removing the manifold. There is very little space to work with it removed, and I don't how you can get access with it in place.

Before beginning and with the engine off give the brakes a few pumps to dissipate the vacuum pressure in the system.

You are going to remove the intake manifold to give you room to access the pump.
Figure 1

You are going to remove the intake manifold to give you room to access the pump. Please see our article on intake manifold removal for additional assistance.

The vacuum pump is located at the rear of the right cylinder bank and is driven off of the right cylinder cam (red arrow).
Figure 2

The vacuum pump is located at the rear of the right cylinder bank and is driven off of the right cylinder cam (red arrow).

After pumping the brakes a few times disconnect the brake vacuum line (red arrow) and the smaller line off to the side of the pump (yellow arrow).
Figure 3

After pumping the brakes a few times disconnect the brake vacuum line (red arrow) and the smaller line off to the side of the pump (yellow arrow).

You are going to be removing three E10 bolts from the back of the pump.
Figure 4

You are going to be removing three E10 bolts from the back of the pump. They are difficult to reach. You do NOT want to strip them. Make sure you are using the right tool (red arrow).

Unclip the hoses that mount to the firewall and pull them back to give you some more room (red arrow).
Figure 5

Unclip the hoses that mount to the firewall and pull them back to give you some more room (red arrow). Disconnect the right side cam sensor (yellow arrow). This will give you a little more room to reach down behind the pump (green arrow).

Take a small mirror and locate the three bolts that mount the pump to the head.
Figure 6

Take a small mirror and locate the three bolts that mount the pump to the head. Next, you will have to work blind or by feel but reach down behind the pump and remove the three E10 bolts.

With the bolts removed you can remove the pump from the cam.
Figure 7

With the bolts removed you can remove the pump from the cam. Note the position of the pump drive adaptor that has two metal studs that come out of it (red arrows). These need to line up with the cam when installing the new pump so try not to rotate them.

If the pump only has an external leak you can replace the O-ring and reinstall it (red arrow).
Figure 8

If the pump only has an external leak you can replace the O-ring and reinstall it (red arrow). If you are replacing the pump, note the placement of the drive adaptor ring on the old pump and rotate the new pump's ring to the same orientation as the old one; this will help it line up with the cam when installing. Installation is the reverse of removal, and try not to drop any of the bolts.



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Comments and Suggestions:
roach Comments: Hi, what are the torque specs for reattaching the vacuum pump ?
October 28, 2016
  Followup from the Pelican Staff: I don’t have that info.

I would grab a repair manual. It will have the procedure, special tools and torque specs.


Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 

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