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
128
–
Install intake manifold (top section)
⇒
Rep. Gr. 23.
Cylinder head (right-side):
–
Renew sealing cap (front) on cylinder head.
–
Using a suitable drift, knock in new sealing cap (core plug)
until flush.
Continuation for both sides:
–
Install camshaft timing chains
⇒
page 77
.
Tightening torques
2.5
Checking hydraulic valve compensation el-
ements
♦
Hydraulic valve compensation elements cannot be serv-
iced.
♦
Irregular valve noises when starting engine are normal.
Special tools and workshop equipment required
♦
Feeler gauge
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).
If the irregular valve noise stops but repeatedly re-occurs
when driving short distances, the oil retention valve -arrow-
at the rear end of the respective cylinder head must be re-
newed.
If the hydraulic tappets are still noisy, locate defective tappet
as follows:
–
Remove cylinder head cover (left or right)
⇒
page 107
.
–
Rotate crankshaft until cam of hydraulic compensation el-
ement to be checked faces upwards (remove noise insula-
tion panel and rotate crankshaft clockwise via central bolt
for vibration damper).
Component
Nm
Retaining frame to cylinder head
9
Toothed belt drive sprocket to camshaft
75
Note
Note
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