Overview - Crankcase Ventilation

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2020 Audi A4 allroad, 2020 Audi A4 Quattro, 2019 Audi A4 allroad, 2019 Audi A4 Quattro, and 2018 Audi A4 allroad. 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 appropriate service 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-.