aaz_1z_ahu_sprezarka audi 80.pdf

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21-1

Turbocharger system

components, servicing

Engine codes: AAZ, 1Z, AHU

Observe rules of cleanliness

Page 21-10

Turbocharger hoses and lines, connecting

Page 21-11

WARNING!

Do not re-use any fasteners that are worn or

deformed in normal use.

Some fasteners are designed to be used only

once, and are unreliable and may fail if used

a second time. This includes, but is not

limited to, nuts, bolts, washers, circlips and

cotter pins. Always follow the

recommendations in this manual-replace

these fasteners with new parts where

indicated, and any other time it is deemed

necessary by inspection.

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Notes:

All hose connections are secured with clips.

Charge air system must be free of leaks.

Always replace self-locking nuts.

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21-2

Turbocharger system components, removing and

installing (engine code AAZ)

Notes:

Boost pressure control is switched off during part throttle

operation by EGR part throttle switch -F166- and two-way

valve for EGR -N161-

Checking and adjusting part throttle switch Page 26-23

Checking two-way valve Page 26-20

1 - Exhaust manifold

2 - 25 Nm (18 ft lb)

3 - Hose

To Diesel injection pump

4 - Gasket

Always replace

Coating (beading) faces intake manifold

5 - Intake manifold

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21-3

6 - 45 Nm (33 ft lb)

Always replace

Coat threads and bolt head sealing surfaces with

high temperature (2000F) anti-seize compound

7 - Gasket

Always replace

Note installation position

8 - To Positive Crankcase Ventilation (PCV) valve

9 - From Air Cleaner

10 - Turbocharger

Removing and installing Page 21-12

Boost pressure, checking Page 21-18

11 - Turbocharger wastegate

Integral part of turbocharger cannot be replaced

separately

Hoses and lines, connecting Page 21-11

12 - Oil return line

To cylinder block

13 - Sealing rings

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Always replace

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