Audi Q7 2007
!
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
Repair Group 15 – Cylinder head, valve gear
6
132
–
If valve cotters have been removed from assembly car-
tridge -VAS 5161/8-, they need to be put into valve inser-
tion device -VAS 5161/18- first.
Larger diameter of valve cotters faces upwards.
–
Insert valve spring and valve spring plate.
–
Press assembly cartridge onto valve insertion device from
above and take up valve cotters.
–
Re-insert assembly cartridge into guide plate -VAS 5161/
23-.
–
Push pressure fork down and pull knurled screw upwards
while turning screw in both directions - this will insert the
valve cotters.
–
Release the pressure fork with knurled screw still in pulled
position.
Installation is carried out in the reverse order; note the follow-
ing:
–
Install glow plugs
⇒
Rep. Gr. 28.
–
Install camshafts
⇒
page 123
.
♦
Audi Q7 models with a 3.0 ltr. TDI engine are always
equipped with steel glow plugs.
♦
Engine is not to be rotated for approx. 30 minutes after in-
stalling camshafts. Hydraulic valve compensation ele-
ments have to settle (otherwise valves will strike pistons).
♦
After working on the valve gear, turn the engine carefully
at least 2 rotations to ensure that none of the valves make
contact when the starter is operated.
2.7
Valve dimensions
Inlet and exhaust valves must not be machined. Only grinding-
in is permitted.
Dimension
Inlet valve
Exhaust valve
∅
a
mm
28.60 … 28.80
26.70 … 26.90
∅
b
mm
5.968 … 5.982
5.958 … 5.972
c
mm
97.25 … 97.45
97.35 … 97.55
α
∠°
45
°
10'
45
°
10'
Note
Note
Note
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