HOW TO – REPLACE CAM FOLLOWER ON 2005.5-2008 AUDI A4 (B7)
ACKNOWLEDGEMENT: I would like to thank BJ McGee for posting the original photos and providing the
step-by-step instructions on how to replace the cam follower. I used photos posted by him quite
extensively in this document and the process as a general guide with some notations. You can find the
source following this link, http://picasaweb.google.com/BJ.McGee/AudiA4FSICamFollowerInstall#
. I also
used Bentley repair manual for some information, specifically for component locations, torque
specifications and general precautions. Particularly, I pulled the procedure on relieving the pressure in the
fuel pump from that repair manual.
DISCLAIMER: Please use this document as a general guide for replacing the cam follower. I take no
responsibility for any damage that this procedure may cause to you or your vehicle and its components.
Should you have any questions, you can reach me by email, illegititmus@yahoo.com
or by PM on
http://www.audizine.com to “illegitimus”.
Before proceeding, the pressure has to be reduced in the high pressure fuel lines. To do so,
follow the below steps:
- open the fuse box located on the driver’s side of the dash, at the door hinge: price the fuse box
cover with a flathead screwdriver;
- fuse - 28 - from the Fuel Pump (FP) Control Module J538 must be removed before opening fuel
system. Otherwise, the fuel pump will be activated by the drivers door contact switch;
• By removing fuse - 28 - , the voltage supply to "terminal 30" for the Fuel Pump (FP) Control
Module J538 is interrupted.
CAUTION!
• The fuel injection system is divided into a high pressure section (maximum approximately
110 bar) and a low pressure system (approximately 6 bar).
• Before opening high pressure parts, e.g. removing high pressure pump, fuel rail, fuel
injectors, fuel pipes or Fuel Pressure Sensor G247, fuel pressure in high pressure area
must be reduced to a residual pressure of approximately 6 bar. The procedure for this is
as follows.
- High fuel pressure, reducing:
• Remove electrical connector - 2 - from Fuel Pressure Regulator Valve N276
• Allow engine to idle approximately 10 seconds.
• By removing the electrical connector from the Fuel Pressure Regulator Valve N276 in idle,
the fuel pressure is reduced from approximately 50 bar to approximately 6 bar.
• The decreasing fuel pressure can be decreased if a Vehicle Diagnosis and Service Syst. VAS
5052 is connected and engine control module is selected. And select display group 140 under
"Read measured value block" function.
