2.10 Checking Valves - Audi Q7 2007 Workshop Manual

Audi Q7 2007 !
6
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
Procedure
–
Insert valve into valve guide.
•
End of valve stem must be flush with valve guide.
Note
Only insert inlet valve into inlet guide and exhaust valve into
exhaust guide, as the stem diameters are different.
–
Determine amount of sideways play:
•
Wear limit: 1.0 mm.
Note
If the wear limit is exceeded, repeat the measurement with
♦
new valves. Renew cylinder head if wear limit is still ex-
ceeded. Valve guides cannot be renewed.
If the valve has to be renewed as part of a repair, use a
♦
new valve for the measurement.

2.10 Checking valves

–
Visually inspect for scoring on valve stem and on surface
of seat.
If scoring is clearly visible:
–
Renew the relevant valve.
134
Repair Group 15 – Cylinder head, valve gear
更多资料请访问深度汽车论坛 http://shenduauto.com/ 客服QQ：1398556747 电话：18218750259