Checking Hydraulic Valve Compensation Elements - Audi A8 2003 Workshop Manual

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
– If valve cotters had been removed from assembly cartridge
they must first be inserted in insertion device -VAS 5161/18- .
Note
Larger diameter of valve cotters faces upwards.
– Press assembly cartridge onto insertion device from above
and take up valve cotters.
– Insert valve spring and valve spring plate.
– Re-insert assembly cartridge -VAS 5161/8- into guide plate.
– Push pressure fork down and pull knurled screw upwards,
while turning screw in both directions – this will insert the valve
cotters.
– Release pressure fork with knurled screw still in pulled posi‐
tion.
– Repeat procedure for each valve.
Assembling
Installation is carried out in the reverse order; note the following:
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– Ensure that all roller rocker fingers make contact with the ends
with respect to the correctness of information in this document. Copyright by AUDI AG.
of the valve stems correctly and are clipped onto their respec‐
tive hydraulic compensation elements.
– Install camshafts ⇒ page 167
3.7 Checking hydraulic valve compensation
elements
Special tools and workshop equipment required
♦ Feeler gauge
Note
Hydraulic valve compensation elements cannot be serviced.
♦
Irregular valve noises when starting engine are normal.
♦
Procedure
– Start engine and run until coolant temperature reaches ap‐
prox. 80 °C.
– Increase engine speed to approx. 2500 rpm for 2 minutes
(perform road test if necessary).
Note
If the irregular valve noise stops but repeatedly re-occurs
♦
when driving short distances, then the oil retention valve is
defective.
The oil retention valve is integrated in the mounting plate
♦
⇒ Item 2 (page 203)
If the hydraulic valve compensation elements are still noisy, locate
the defective element as follows:
.
and cannot be replaced on its own.
Audi A8 2003 ➤
179
3. Servicing valve gear