1998 AUDI A4 AWM Engine Valve Gear Service Workshop Manual

15-75
If the hydraulic lifters are still noisy, locate faulty
lifters as follows:

- Remove cylinder head cover Page 15
-15
.

- Rotate crankshaft until cams of lifters to be
checked are pointing upward:

- Vehicles with manual gearbox: push vehicle
forward with 4th gear engaged and ignition
switched off.

- Vehicles with automatic gearbox: remove
sound insulation and turn crankshaft clockwise
by applying wrench to central bolt on
crankshaft sprocket.

- Determine play between cam and lifter.

- Press down lifter with a wooden or plastic wedge. If an 0.20 mm feeler
gauge can be inserted between camshaft and lifter, replace lifter.
- Replacing lifter Removing and installing camshafts and camshaft
adjuster, Page 15
-62
.
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15-76

Note:

Wait about 30 minutes after installing the
camshafts before starting the engine. Hydraulic
valve compensation elements have to settle
(otherwise valves will strike pistons).
After working on the valve gear, turn the engine
carefully at least 2 rotations to ensure that none
of the valves make contact when the starter is
operated.
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15-77


Valve stem seals, replacing

Special tools and equipment

Pressure hose VW 653/3
Spark plug spanner 3122 B
Puller 3364
Installation tool 3365
Disassembly and assembly tool VAS 5161
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15-78

Removing

Cylinder head in vehicle.

- Remove camshafts and camshaft adjuster
Page 15
-62
.

Note:

Ensure that the valve lifters are not
interchanged.
Mark position of valve lifters on rear of lifter with
a waterproof felt-tip pen.

- Remove lifters from guides and put them down
with contact surface downward.

- Remove spark plugs with spark plug spanner
3122B.

- Set piston of appropriate cylinder to bottom dead
center.

- Thread pressure hose VW 653/3 into spark plug threaded hole and
apply constant pressure of at least 6 bar.
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15-79


Exhaust side - Install knock journal VAS 5161/3 into valve lifter guide.
- Loosen solid valve keepers on all five valves with a plastic hammer.

- Thread catch part VAS 5161/6 with insertion fork VAS 5161/4 onto a
stud of cylinder head.
- Push guide bushing VAS 5161/14 as far as it will go into lifter guide at
valve to be removed.

Installation position: Shaded areas point across to driving direction.
- Push knurled distance ring VAS 5161/17 onto assembly cartridge VAS
5161/8.
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- Push assembly cartridge into guide sleeve.
- Attach pressure fork VAS 5161/2 to catch part VAS 5161/6 and press
assembly cartridge downward.
- At same time turn knurled screw of assembly cartridge toward right
until tips engage in valve keepers.
- Slightly move knurled screw back and forth. This causes valve keepers
to be pressed apart and taken into cartridge.
- Release pressure fork.
- Remove assembly cartridge with spacer ring, guide bushing, valve
plate and valve spring.
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15-81

Intake side:

- Thread catch part VAS 5161/6 with insertion fork VAS 5161/4 onto a
stud of cylinder head.
- Push in guide bush VAS 5161/13 as far as it will go into lifter guide at
valve to be removed.

Installation position: Shaded areas point across to driving direction.
- Push distance ring VAS 5161/17 onto assembly cartridge VAS 5161/8.
- Push assembly cartridge into guide sleeve.
- Attach pressure fork VAS 5161/2 to catch part VAS 5161/6 and press
assembly cartridge downward.
- At same time turn knurled screw of assembly cartridge towards right
until the tips engage in valve keepers.
- Slightly move knurled screw back and forth. This causes valve keepers
to be pressed apart and taken into cartridge.
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15-82


All models: - Release pressure fork.
- Remove cartridge with spacer ring, guide bushing, valve plate and
valve spring.

- Use 3364 to pull off valve stem seals.
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