1997 AUDI A4 AWM Engine Valve Gear Service Workshop Manual

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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15-46


24 -
Sealing ring
For intake camshaftReplacing Page 15
-57
25 -
Rotor for Camshaft Position sensor
Note correct installation position: Insert tab
in notch of camshaft
26 -
Washer With coneNote installation position
27 -
25 Nm
28 -
Housing for Camshaft Position sensor -
G40-
29 -
10 Nm
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15-47


Note:
Intake and exhaust valves must not be reworked. Only lapping in is
permitted.
CAUTION! Fig. 1 Valve dimensionsDimension
Intake valve
Exhaust valve
Diameter -a- mm 26.80 to 27.00 29.80 to 30.00
Diameter -b- mm 5.95...5.97 5.94 to 5.95
-c- mm 104.84 to 105.34 103.64 to 104.14


45 45
Worn exhaust valves with sodium filling must not be disposed of
until they have been treated as follows: The valves must be sawn into two sections with a metal saw at a
point between the center of the shaft and the valve head. They
must not come into contact with water while this is done. Then
throw the valves into a bucket of water (not more than ten at a
time). Step back immediately because a chemical reaction occurs
when the sodium filling burns. After this treatment the valves can be disposed of in the normal
way.
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15-48

Camshaft axial clearance, checking


Special tools and equipment

Universal dial indicator bracket VW 387Dial indicator
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15-49

Test sequence
Perform measurement with hydraulic lifters
removed and with bearing cap at chain sprocket
end and double bearing cap at camshaft
sprocket end installed.

- Attach dial indicator with universal dial indicator
holder VW 387 to cylinder head:

Intake camshaft

Exhaust camshaft
Wear limit for intake and exhaust camshafts.
Axial clearance: no more than 0.20 mm
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15-50


Exhaust camshaft oil seal, replacing

Special tools and equipment

Oil seal extractor 2085
Holding tool 3036
Assembly tool T10071
Socket head fastener T10092
Pin T40011
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15-51

Removing

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

- Remove engine cover -arrows-.
- Remove upper toothed belt guard Page 13
-35
.
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15-52


- Set crankshaft to markings for TDC of No. 1 cylinder by turning central
bolt on crankshaft sprocket in direction of rotation -arrows-.

Note:
Only tension piston of tensioner until pressure piston is secured with pin
T40011. - Attach socket head fastener T10092 into tensioner for toothed belt.
- Take toothed belt off camshaft sprocket.
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