service AUDI A8 1999 D2 / 1.G AHA ATQ Engines Valve Gear Service Manual

15-2

Notes:

Cylinder heads with small cracks between the
valve seats that are less than 0.3 mm (0.012
in.) wide and/or between one valve seat and
only the first four threads of the spark plug
thread, can continue to be used without
reduced service life.
Carefully apply a small amount of sealant D 454
300 A2 at the four end points of the sealing
surfaces on the cylinder head using a small
screwdriver page 15
-13
.

CAUTION!

Part numbers are listed here for reference
only. Always check with your Parts
department for the latest information.
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15-18

Cylinder head, removing and installing


Note:
The following instructions apply to the left
cylinder head.

Removing

Lock carrier in service position page 13
-
1 .

- Remove ribbed belt page 13
-8 .

- Remove toothed belt page 13
-12
.

- Remove engine cover (arrows).

- Remove noise insulation panel (arrows).
- Unbolt left and right-side front exhaust pipes from exhaust manifold.
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15-31

Camshafts and camshaft adjusters,
removing and installing


Removing

- Remove engine cover (arrows).
Cylinder head installed Lock carrier in service position page 13
-1
- Remove ribbed belt page 13
-8 .
- Remove toothed belt page 13
-12
.

Left-side cylinder head - Remove noise insulation panel (arrows).
- Unbolt engine coolant expansion tank from bracket and lay aside.
- Remove crankshaft housing ventilation line from valve cover.
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15-47

Valve stem oil seals, replacing


Cylinder head installed
Lock carrier in service position page 13
-1

- Remove ribbed belt page 13
-8 .

- Remove toothed belt page 13
-12
.

- Remove camshafts page 15
-31
.

- Remove valve lifters (do not interchange) and
lay aside with contact surface facing down.

- Remove spark plugs.

- Move piston for individual cylinder to Bottom
Dead Center (BDC) position.

Note:
Lightly tap valve lever to loosen stuck valve
keepers.

Exhaust side

Note:
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gear, servicin
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yp
e=re
pair&id=AUDI.B5.GE03.15.1