1997 AUDI A4 check oil

15-40


7 -
Valve springs
Removing and installing Page 15
-77
8 -
Valve spring plate
9 -
Valve keepers
10 -
Hydraulic valve lifter
Checking Page 15
-74
Removing and installing Page 15
-77
Do not interchangeStore with cam contact surface downwardBefore installing check camshaft axial
clearance Page 15
-48

Oil contact surface
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15-60

Installing

Note:

Production variations may have the shaft
sealing rings with ring spring or PTFE sealing
rings used at the intake camshaft.

Installing PTFE sealing ring:
Difference: The regular shaft sealing ring has only one sealing lip -
arrow 1- which is tensioned by a spring. The PTFE sealing ring has a
thread-like sealing area -arrow 2- but no spring. When installing, the sealing surface of the PTFE sealing ring must not
be stretched. For this reason it is not permitted to install the PTFE
sealing ring together with the guide sleeve for sealing rings with
spring. The PTFE sealing rings must be aligned to the rotation direction of the
shaft (see arrow marking on sealing ring). The wrong rotation direction
causes oil leakage.

Note:
Do not oil sealing lip of oil seal. - Check edge of chamfer -arrow- on shaft end of intake camshaft for
burrs or sharp edges. If necessary, smooth edge with an oil stone.
- Push PTFE sealing ring carefully onto shaft end by hand.
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15-74

Hydraulic valve lifters, checking


Special tools and equipment

Feeler gauge
Wood or plastic wedge

Note:
Hydraulic valve lifters cannot be adjusted or
repaired.
Irregular valve noise during starting is normal.

Test sequence

- Start engine and let run until coolant
temperature has reached approx. 80 C.

- Increase engine speed to about 2500 rpm for 2
minutes (perform road test if necessary).

Note:
If the irregular valve noises stop but recur
repeatedly during short journeys, a new oil
retention valve must be fitted. Oil retention valve
location: In oil filter bracket -Item 6 -, Page
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