checking oil AUDI A8 1999 D2 / 1.G AHA ATQ Engines Valve Gear Service Manual
Page 3 of 62
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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Page 5 of 62
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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Page 9 of 62
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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Page 11 of 62
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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Page 34 of 62
15-29
Compression, checking
Test conditions
Engine oil temperature at least 30 C
Battery fully charged
- Disconnect harness connectors from all 6 fuel
injectors.
- Disconnect 5-pin harness connector from power
output stage of ignition coils.
- Open throttle fully.
- Use VAG1381 or VAG1763 compression tester
to check compression.
- Operate starter until no further pressure
increases are indicated by VAG1381 or
VAG1763 compression tester.
Compression pressure
New
Wear
limit Max. permissable
difference between
cylinders
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