Valve Dimensions - Audi Q7 2007 Workshop Manual

Audi Q7 2007 !
6
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
–
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.
Note
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
Note
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

Note
Inlet and exhaust valves must not be machined. Only grinding-
in is permitted.
Dimension
∅ a
mm 28.60 ... 28.80
∅ b
mm 5.968 ... 5.982
c mm 97.25 ... 97.45
α ∠°
132
Repair Group 15 – Cylinder head, valve gear
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123.
Inlet valve Exhaust valve
26.70 ... 26.90
5.958 ... 5.972
97.35 ... 97.55
45° 10' 45° 10'