Overview - Crankcase Ventilation

Fig 1: Crankcase Ventilation Components Location

Courtesy of AUDI OF AMERICA, LLC

1. Bleed Pipe
2. O-ring
   • No replacement part
3. Seal
   • No replacement part
4. Oil Separator
   • On the cylinder head cover
   • There are different versions depending on the model. Refer to OIL SEPARATOR . Refer to the Parts Information for the allocation.
   • Removing and installing. Refer to OIL SEPARATOR, REMOVING AND INSTALLING, ON CYLINDER HEAD COVER, VERSION 2 .
5. Bolt
   • Tightening Specifications and Sequence. Refer to Fig 5.
6. Seal
   • Replace if damaged
7. Seal
   • Always replace after removing.
8. Oil Separator
   • On cylinder block
   • There are different versions depending on the model. Refer to OIL SEPARATOR . Refer to the Parts Information for the allocation.
   • Removing and installing. Refer to OIL SEPARATOR, REMOVING AND INSTALLING .
9. Bolt
   • Tightening specification and sequence. Refer to Fig 3.

Fig 2: Oil Separator Bolt Tightening Sequence (8 Bolts, Side Of Motor)

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts to 9 Nm in the following sequence: -1 to 8-.

Fig 3: Oil Separator Bolt Tightening Sequence (9 Bolts, Side Of Motor)

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts to 9 Nm in the sequence -1 to 9-.

Fig 4: Oil Cap And Cylinder Head Cover Bolts Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts in the sequence -1 to 6- to 11 Nm.

Fig 5: Oil Separator Bolts - Tightening Sequence (Top Of Motor)

Courtesy of AUDI OF AMERICA, LLC

TIP: 

The bolts are self-tapping. Only use original bolts when replacing the cylinder head, since the cylinder head is delivered without a thread for the installing the crankcase ventilation.

It is not permitted to cut the thread with a thread cutter.

-- Tighten the bolts in the sequence -1 to 10- to 11 Nm.