Checking Compression; Servicing Valve Gear - Audi Q7 2007 Workshop Manual

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Tightening torques
Component
Coolant line to cylinder head
Coolant pipe (right-side) to cylinder head
Toothed belt drive sprocket to camshaft
Toothed belt cover (rear) to engine
Fuel supply and return lines to high-pressure
pump
1.5

Checking compression

To check compression, select function "Systems with self-di-
agnosis capability" in "Guided Fault Finding" ⇒ Vehicle diag-
nosis, testing and information system VAS 5051.
Procedure
–
Check compression via "Cylinder-selective engine speed".
2

Servicing valve gear

Note
After installing camshafts, wait for approx. 30 minutes be-
♦
fore starting engine. 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 by hand to ensure that none of the
valves make contact when the starter is operated.
The following diagrams show the cylinder head on cylinder
♦
bank 2 (left-side).
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
Nm
15
9
75
9
25
2 Servicing valve gear
Audi Q7 2007 !
6
117