Overview - Crankcase Ventilation

WARNING: This page is about a different car, the 2021 Audi A6 Quattro, 2020 Audi A6 Quattro, and 2019 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Crankcase Ventilation Exploded View

Courtesy of AUDI OF AMERICA, LLC

Cylinder Head Cover
Seal
- Always replace after removing.
Hose
- To the EVAP Canister Purge Regulator Valve 1 -N80-
Oil Separator
- Removing and installing. Refer to OIL SEPARATOR, REMOVING AND INSTALLING .
Seal
- Always replace after removing.
Hose
- For the crankcase ventilation
- To the turbocharger
- There are different versions. Refer to the Parts Information for the allocation.
Bolt
- 4 Nm
- Thread cutting
- Position the bolt by hand and tighten it until it finds the old threads. Then tighten the bolt to the specification.
Seal
- Always replace after removing.
Bolt
- Tightening Specifications and Sequence
  - Refer to Fig 2.
- Thread cutting
- Position the bolt by hand and tighten it until it finds the old threads. Then tighten the bolt to the specification.

Oil Separator - Tightening Specifications and Sequence

Fig 2: Oil Separator - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts to 9 Nm in the following sequence: -1 to 7-.