1997 AUDI A4 AEB ATW Engines Valvetrain Servicing Workshop Manual

15-38


23 -
Intake valve
Do not reface by grinding; only hand
lapping is allowed Valve dimensions Page 15
-39
, Fig. 1
Checking valve guides Page 15
-66
Refacing valve seats Page 15
-71
24 -
Oil seal
For intake camshaftReplacing Page 15
-42
25 -
Shutter wheel for Camshaft Position
(CMP) sensor -G40-
Note position: insert lug in camshaft notch
26 -
Washer ConicalNote position
27 -
Bolt 25 Nm (18 ft lb)
28 -
Camshaft Position (CMP) sensor -G40-
housing
29 -
Bolt 10 Nm (7 ft lb)
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15-39


WARNING! Fig. 1 Valve dimensions
Valves must not be refaced by cutting or grinding.Only hand lapping is permitted.Dimension
Intake valve
Exhaust valve
Diameter -a-
mm
(in.) 26.80-27.00(1.055-
1.063) 29.80-30.00(1.173-
1.181)
Diameter -b-
mm
(in.) 5.95-5.97
(0.2339-0.2350) 5.94-5.95
(0.2339-0.2343)
Length -c- mm
(in.) 104.84-105.34
(4.127-4.147) 103.64-104.14
(4.080-4.099)
Angle -a-

45
45
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15-40

WARNING!

Sodium-filled exhaust valves must not be
scrapped without first being properly treated.
The valves must be cut open using a
hacksaw, by hand, between the valve head
and the middle of the stem.
The valves must not come into any contact
with water while being cut.
After cutting open the valves, throw not more
than 10 at a time into a bucket of water and
step back. A sudden chemical reaction will
occur during which the sodium filling is
consumed.
Valves that have been treated in this way can
be disposed of as normal waste.
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15-41

Camshafts axial play, checking


Special tools and equipment

VW387 dial gauge holder
Dial indicator
Measure with installed bearing cap on chain
sprocket side and double bearing cap on
camshaft side with valve lifters removed.

- Secure VW387 dial gauge holder with dial
indicator to cylinder head.

Intake camshaft

Exhaust camshaft
Wear limit for intake and exhaust camshafts:
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Axial play max.: 0.20 mm (0.008 in.)
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15-42

Oil seals for camshafts, replacing


Cylinder head installed
Lock carrier in service position Page 13
-1

Special tools and equipment

2085 seal puller
3241 seal installer
3036 retainer

Replacing exhaust camshaft oil seal

Removing

- Remove ribbed belt and ribbed belt tensioner
Page 13
-15
.

- Remove engine covers.

- Remove upper toothed belt cover Page 13
-
29
.

-
Turn crankshaft at central bolt of toothed belt gear in direction of
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engine rotation to TDC Cyl. 1 marking (arrows).
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15-43

CAUTION!

Before removing toothed belt, note direction
of rotation with chalk or felt-tip marker.
Reversing the direction of rotation of a used
belt can destroy the belt.

- Loosen tensioner (arrows) and lift toothed belt from camshaft gear.
- Use 3036 Retainer to loosen camshaft gear.
- Remove camshaft gear.

- Thread camshaft gear retaining bolt (arrow) into camshaft by hand until
stop to guide 2085 seal puller.
- Unthread inner part of 2085 seal puller two turns (approx. 3 mm or 0.12
in.) and secure using knurled bolt.
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