ECU AUDI A6 1998 C5 / 2.G AHA ATQ Engines Valve Gear Service Manual

15-4


5 -
Cap
Always replace
6 -
Intake camshaft bearing cap Note installation position and numbering
page 15
-36

7 -
Intake 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.)
8 -
Drive chain Installing page 15
-36
9 -
Bolt
10 Nm (7ft lb)
10 -
Mechanical camshaft adjuster With valve -1- for camshaft adjustment -
N205- Secure using 3366 bracket tensioner
before removing page 15
-31

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15-9


9 -
Intake 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.)
10 -
Drive chain Installing page 15
-36
11 -
Bolt
10 Nm (7ft lb)
12 -
Mechanical camshaft adjuster With valve -1- for camshaft adjustment -
N205- Secure using 3366 bracket tensioner
before removing page 15
-31

13 -
Hydraulic valve lifter (intake)
Refer to notes page 15
-45
Removing and installing with cylinder head
installed page15
-31

14 -
Valve keepers
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15-34


Note:
If the bracket tensioner is tightened too far, the camshaft adjuster may be
damaged. - Secure camshaft adjuster with 3366 bracket tensioner.

- Verify that camshafts are at TDC.
Both camshaft markings must align with arrows on bearing caps.
- Clean camshaft drive chain and camshaft chain gears opposite both
arrows on bearing caps. Mark installed position with paint.
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15-42

Camshaft axial play, checking


- Remove camshafts page 15
-31
.

- Remove hydraulic valve lifters.

- Install camshafts without chain into cylinder
head and tighten with bearing caps 2 and 4.

- Secure VW387 dial indicator holder with dial indicator to cylinder head.
- Press camshaft by hand against dial indicator.
- Set dial indicator to zero.
- Press crankshaft away from dial indicator.
- Read clearance.
New
Wear limit
0.05-0.15 mm (0.0020-0.0059 in.) 0.20 mm (0.0079 in.)
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