dimensions AUDI A4 1999 B5 / 1.G 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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15-47


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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15-89

Calculating maximum permissible reworking
dimension

- Insert valve and press firmly against valve
seat.

Note:
If the valve is to be replaced as part of a repair,
use a new valve for the calculation.

- Measure distance -a- between valve stem end (upper edge) and upper
cylinder head surface -1- with a depth gauge.
- Calculate max. permissible reworking dimension from measured
distance and minimum dimension.
Minimum dimensions
Outer intake valves Central intake valve Exhaust valves
31.0 mm 32.2 mm 31.9 mm
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