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Home >> Audi >> 2007 >> Q7 4.2 >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (3.0L - Cylinder Head & VALVETRAIN - Engine Code(S): CJTB, CJTC, CNAA, CJWB, CJWC, CJWE, CTWA, CTWB) >> 15 Cylinder Head, VALVETRAIN >> VALVETRAIN >> Notes

15 Cylinder Head, VALVETRAIN: VALVETRAIN: Notes

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CAUTION:

Risk of damaging valves and piston heads after working on valve train.

  • The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves.
  • To ensure valves do not strike pistons when starting, carefully rotate engine at least two full revolutions.
NOTE:

Cylinder heads with cracks between the valve seats, or between the valve seat and the spark plug threads, can continue to be used without reducing the service life, as long as the cracks have a width of max. 0.3 mm, or only the first 4 threads of the spark plug threads are cracked.

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