1997 AUDI A4 Valve guides

15-39


4 -
Cylinder head
See note Page 15
-37
Checking valve guides Page 15
-86
Reworking valve seats Page 15
-88
Dowel sleeves for bearing caps must be
located in cylinder head. Seal joints Fig. 3
and Fig. 4
,
Page 15
-8
5 -
Valve guide
Checking Page 15
-86
6 -
Valve stem seal
Replacing Page 15
-77
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15-45


22 -
Exhaust valve
With sodium fillingNote instructions on scrapping valves with
a sodium filling Page 15
-47

Do not rework, only lapping in is permittedValve dimensions Fig. 1
, Page 15
-
47

Checking valve guides Page 15
-86
Reworking valve seats Page 15
-88
23 -
Intake valve
Do not rework, only lapping in is permittedValve dimensions Fig. 1
, Page 15
-
47

Checking valve guides Page 15
-86
Reworking valve seats Page 15
-88Pa
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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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15-86

Valve guides, checking


Special tools and equipment

Test sequence
Universal dial indicator bracket VW 387Dial indicator

Note:
Due to the slight difference in stem diameters, ensure that only an intake
valve is used in an intake guide and an exhaust valve in an exhaust
guide. - Set valve in guide. Valve stem end must be flush with guide.
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15-88

Valve seats, reworking


Note:
If a good seating pattern cannot be obtained by
grinding the valve seats (lapping), they must be
refaced (reworked):

Special tools and equipment

Depth gauge
Valve seat machining tool

Note:
When repairing engines with leaking valves, it is
not sufficient to reface the valve seats and
replace the valves. The valve guides must also
be checked for wear. This is particularly
important on high mileage engines Page 15
-
86
.

Only rework the valve seats as far as is
necessary to ensure a good seating pattern.
Before starting to rework the valve seats,
calculate the maximum permissible reworking
dimension.
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