Audi Workshop Service and Repair Manuals > A4 Cabriolet Mk2 > Power unit | 6-cylinder diesel direct injection engine (TDI), mechanics | Exhaust system | Exhaust gas recirculation system | Removing and installing mechanical exhaust gas recirculation valve - engine code letters AKE, AYM, BAU, BCZ, BFC

Removing and installing mechanical exhaust gas recirculation valve - engine code letters AKE, AYM, BAU, BCZ, BFC

Special tools and workshop equipment required

t	Ring spanner -3035-

t	Torque wrench -V.A.G 1331- with 17 mm attachment (commercially available)

Removing

–	Remove starter catalytic converter: vehicles with front-wheel drive → Chapter, vehicles with four-wheel drive → Chapter.

–	Remove intake manifold (front section) → Rep. Gr.23.

–	Mark position of retaining clips on injector pipes (e.g. with felt-tip pen).

–	Mark injector pipes according to cylinder (e.g. with felt-tip pen).

–	Disconnect injector pipes one by one with ring spanner -3035-.

–	Detach vacuum hose at mechanical exhaust gas recirculation valve -arrow-.

–	Remove nuts -1- and bolt -2-.

–	Detach mechanical EGR valve.

Installing

Installation is carried out in the reverse order; note the following:

Note

Renew gaskets and self-locking nuts.

–	Fit injector pipes one at a time, working from bottom to top and secure using torque wrench -V.A.G 1331- and 17 mm attachment (commercially available).

l	Ensure stress-free installation of injector pipes.

–	Make sure that retaining clips are positioned correctly.

–	Install starter catalytic converter: vehicles with front-wheel drive → Chapter, vehicles with four-wheel drive → Chapter.

Tightening torques

Component		Nm
Mechanical EGR valve to	intake manifold (left-side)	22
Mechanical EGR valve to	Connecting pipe for exhaust gas recirculation	22
EGR connecting pipe to intermediate flange		22 → Note
Injector pipes to:	Injectors	30
Injector pipes to:	Injection pump	30

¹⁾	Renew nuts.

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