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

15-3


Cylinder head without oil lines to camshaft
bearings

1 -
Double bearing cap
Lightly coat with sealant 454 300 02 A2
before installing page 15
-36

2 -
Bolt
10 Nm (7ft lb)
3 -
Exhaust camshaft bearing cap Watch guide sleeveNote installation position and numbering
page 15
-36

Lightly coat last bearing cap (after chain)
with D454 300 A2 sealant before installing
4 -
Exhaust camshaft Checking axial clearance page 15
-42
Removing and installing page 15
-31

Check radial clearance using Plastigage
(hydraulic valve lifters removed):
Wear limit: 0.1 mm (0.004 in.)Max. run-out: 0.01 mm (0.0004 in.)
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15-5


11 -
Hydraulic valve lifter (intake)
Notes page 15
-45
12 -
Valve keepers
13 -
Valve spring retainer
14 -
Valve spring
15 -
Valve stem oil seal
Replacing with cylinder head installed
page 15
-47

16 -
Rubber/metal seal
Always replace
17 -
Seal Always replace
18 -
Cylinder head Removing and installing page 15
-18
Checking for distortion page 15
-27
Resurfacing page 15
-28
19 -
Exhaust valve
20 -
Intake valve
21 -
Oil seal
Camshaft Position (CMP) sensor side
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15-6


22 -
Shutter wheel for Camshaft Position
(CMP) sensor -G40-
Note position (notch on camshaft)
23 -
Washer Conical
24 -
Bolt 25 Nm (18 ft lb)
25 -
Camshaft Position (CMP) sensor -G40-
26 -
Bolt 10 Nm (7 ft lb)
27 -
Bolt 55 Nm (41 ft lb)
28 -
Camshaft sprocket
29 -
Oil seal Toothed belt sideReplacing page 15
-14
30 -
Hydraulic valve lifter
Notes page 15
-45
Removing and installing with cylinder head
installed page 15
-31

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15-7


Cylinder head with oil lines to camshaft
bearings

1 -
Double bearing cap
Lightly coat with 454 300 02 A2 sealant
before installing page 15
-17

2 -
Exhaust camshaft bearing cap
With oil line connectorWatch guide sleeveNote installation position and numbering
page15
-31

Lightly coat last bearing cap (after chain)
with D454 300 A2 sealant before installing
3 -
Bolt 10 Nm (7 ft lb)
4 -
Oil line Exhaust sideFrom VIN 8D-W-005 001For bearing cap lubricationNote installed position Fig. 4
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15-8


5 -
Exhaust camshaft
Checking axial clearance page 15
-42
Removing and installing page 15
-31

Check radial clearance using Plastigage
(hydraulic valve lifters removed):
Wear limit: 0.1 mm (0.004 in.)Max. run-out: 0.01 mm (0.0004 in.)
6 -
Cap Always replace
7 -
Oil line Intake sideFrom VIN 8D-W-005 001Note installed position Fig. 3For bearing cap lubrication
8 -
Intake camshaft bearing cap With oil line connectorNote installation position and numbering
page 15
-36

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15-10


15 -
Valve spring retainer
16 -
Valve spring
17 -
Valve stem oil seal
Replacing with cylinder head installed
page 15
-47

18 -
Rubber/metal seal
Always replace
19 -
Seal Always replace
20 -
Cylinder head Removing and installing page 15
-18
Checking for distortion page 15
-27
Resurfacing page 15
-28
21 -
Exhaust valve
22 -
Intake valve
23 -
Oil seal
Camshaft Position (CMP) sensor sideReplacing page 15
-14
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15-11


24 -
Shutter wheel for Camshaft Position
(CMP) sensor -G40-
Note position (notch on camshaft)
25 -
Washer Conical
26 -
Bolt 25 Nm (18 ft lb)
27 -
Camshaft Position (CMP) sensor -G40-
28 -
Bolt 10 Nm (7 ft lb)
29 -
Bolt 55 Nm (41 ft lb)
30 -
Camshaft sprocket
31 -
Oil seal Toothed gear sideReplacing page 15
-14
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15-12

Cylinder head with oil lines on the camshaft
bearings

If connectors are misaligned, oil line bores are exposed (arrows). Fig. 3 Installation position of intake camshaft oil line
-
To install correctly, turn oil line 180 and slide connectors over bores.

If connectors are misaligned, oil line bores are exposed (arrows).
CAUTION!
If the oil lines are incorrectly installed, the camshaft bearings will not
be lubricated and the cylinder head will have to be replaced. Fig. 4 Installation position of exhaust camshaft oil line
-
To install correctly, turn oil line 180 and slide connectors over bores.
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15-14

Cylinder head oil seals, replacing


Oil seal for camshaft drive (left and right
cylinder heads)

- Rotate engine to Top Dead Center (TDC).

- Remove toothed belt page 13
-12
.

- Remove rear toothed belt guard.

Note:
Do not apply oil to sealing lip or outer circumference of seal. - Remove seal using 3240 seal extractor.
- Clean contact surface and sealing surface.
- Install 3241/2 pull sleeve from 3241/1 press sleeve onto camshaft.

- Press seal flush into cylinder head using 3241/1 press sleeve and
3241/3 bolt.
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15-15

Oil seal on Camshaft Position (CMP) sensor
(left and right cylinder head)

- Unbolt Camshaft Position (CMP) sensor.

Tightening torque: 10 Nm (7 ft lb)

- Unbolt shutter wheel for Camshaft Position
(CMP) sensor and carefully pry out using
screwdriver.

Tightening torque: 20 Nm (15 ft lb)

- Screw in bolt from 2085/1 adapter.

Do not lubricate sealing lip or outer edge of seal before pressing in. - Remove seal using 2085 seal puller and bolt from 2085/1.
- Clean contact surface and sealing surface.
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