Audi Workshop Service and Repair Manuals

Removing and installing coolant pipe (top) - not applicable for USA vehicles

Special tools and workshop equipment required

t	Socket, 14 mm -3150-

t	Torque wrench -V.A.G 1331-

t	Ratchet -V.A.G 1331/1-

t	Ring insert (open-end; 17 mm) -V.A.G 1331/2-

t	Ring insert (open-end; 14 mm) -V.A.G 1331/8-

t	Socket, 17 mm -T40055-

Removing   Note All cable ties which are released or cut open when removing must be refitted in the same position when installing. –  Drain off coolant → Chapter. –  Remove intake manifold (top section) → Rep. Gr.24.   WARNING The fuel system operates under high pressure. The pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening the system → Chapter. A clean cloth must then be wrapped around the connection and the residual pressure dissipated by carefully loosening the connection.

–  Disconnect crankcase breather hoses -arrows- from cylinder head covers. –  Move the crankcase breather hoses clear. –  Unscrew bolt -1- and take out hose connection with crankcase breather hoses.

–  Remove high-pressure pipe by unscrewing bolts and union nuts -1 … 6-.

–  Lay a cloth under coolant pipe to catch escaping coolant. –  Detach coolant hose -3- from coolant pipe. –  Unscrew bolts -1- and -2- and pull coolant pipe out of cylinder block towards the rear -arrow-. Installing Installation is carried out in the reverse order; note the following:   Note t  Renew O-ring. t  Fit all cable ties in the original positions when installing. –  Before installing, clean and smoothen sealing surface for O-ring. –  Lubricate new O-ring with coolant additive and slide onto coolant pipe.

–  First hand-tighten union nuts -1-, -4- and -5- for high-pressure pipes, then hand-tighten pipe mountings -2-, -3- and -6-. –  Ensure that high-pressure pipes are not under tension.

–  To secure high-pressure pipe (14 mm) to fuel rail, use torque wrench -V.A.G 1331- with ring insert (open-end, 14 mm) -V.A.G 1331/8-.

–  To secure high-pressure pipe (17 mm) to fuel rail, use torque wrench -V.A.G 1331- with ring insert (open-end, 17 mm) -V.A.G 1331/2-.

–  To secure high-pressure pipe (17 mm) to high-pressure pump, use torque wrench -V.A.G 1331- with ratchet -V.A.G 1331/1- and socket, 17 mm -T40055-. –  Install intake manifold (top section) → Rep. Gr.24. –  Install high-pressure pipes → Rep. Gr.24. –  Fill cooling system → Anchor. Tightening torques

Component	Nm
Coolant pipe to engine	9
Hose connection for crankcase breather hoses to cover	6