Audi Workshop Service and Repair Manuals

Removing and installing high-pressure pipe Special tools and workshop equipment required

t  Torque wrench -V.A.G 1331-

t  Tool insert, AF 17 -V.A.G 1331/6- Removing   WARNING The fuel system operates at extremely high pressure. This can cause injury. The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system. –  Reduce fuel pressure in high-pressure section of injection system → Chapter. –  Remove air conditioner compressor → Rep. gr.21.

–  Press release tabs and detach secondary air hose -arrow- to front from bracket.

–  Remove bolts -arrows- and move intake manifold flap potentiometer -G336- with vacuum unit for intake manifold flap clear to one side.   Note t  Disregard -item 1-. t  The procedure is illustrated for the left-side cylinder bank 2.

–  Unscrew bolts -arrows- and bolt connection -1-. –  Unscrew union nuts -2- and -3- (counterhold threaded connection).   Note Do not attempt to bend high-pressure pipe to a different shape. Installing l  Tightening torques: High-pressure pump - exploded view → Chapter.   Note t  The connections of the high-pressure pipe must not be damaged. t  Do not attempt to bend high-pressure pipe to a different shape.

–  First tighten union nut by hand until it makes contact, making sure that high-pressure pipe is not under tension. –  Tighten union nut with torque wrench -V.A.G 1331- and tool insert, AF 17 -V.A.G 1331/6-; to do so, counterhold at hexagon flats of threaded connection on fuel rail with an open-end spanner. –  Do not tighten bolt for retainer until high-pressure pipe has been tightened. –  Install air conditioner compressor → Rep. gr.21.