Checking Hydraulic Valve Compensation Elements - Audi Q7 2007 Workshop Manual

Audi Q7 2007 !
6
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
–
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
Tightening torques
Component
Retaining frame to cylinder head
Toothed belt drive sprocket to camshaft
2.5 Checking hydraulic valve compensation el-
ements
Note
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).
Note
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)
–
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).
128
Repair Group 15 – Cylinder head, valve gear
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