Audi Workshop Service and Repair Manuals

Removing and installing coolant pipe (top)

Removing   Note Fit all cable ties in the original positions when installing. –  Drain coolant → Chapter. –  Remove intake manifold (top section) → Rep. Gr.24.

–  Remove bolts -arrows- and detach guard plate -1- for high-pressure pipe.

–  Vehicles with secondary air system: press release tabs and detach secondary air hose -arrow- from bracket towards front.   WARNING The fuel system operates at extremely high pressure. This can cause injury. t  The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system. t  Wrap a clean cloth around the connection and carefully loosen the connection to allow the residual pressure to dissipate. –  Reduce fuel pressure in high-pressure section of injection system → Chapter.

–  Unscrew connection -1-. –  Unscrew union nuts -2- and -3- (counterhold connection). –  Unscrew bolts -arrows- on retaining clips and detach high-pressure pipe.

–  Detach connection -arrow- for high-pressure pipe.   Note

Place a cloth under coolant pipe to catch escaping coolant. –  Detach coolant hose -2- from coolant pipe. –  Remove bolt -1- and pull coolant pipe rearwards out of cylinder block -arrow-. Installing l  Tightening torque → Chapter. Installation is carried out in the reverse order; note the following:   Note Fit new O-rings. –  Clean and smoothen sealing surface for O-ring. –  Lubricate O-ring with coolant and slide onto coolant pipe. –  Install high-pressure pipe → Rep. Gr.24. –  Install intake manifold top section → Rep. Gr.24. –  Fill up with coolant → Anchor.