Audi Workshop Service and Repair Manuals

As of engine No. AGR 044 442 or AHF 006 066, respectively as well as for all ALH and ASV engines, a "light valve gear" is used in place of the "old valve gear".

Identification characteristics for the "light valve gear":

• ◆ Inner valve springs no longer used
• ◆ Lower valve plates no longer used

Notes:

• ◆ Differentiating characteristics for old valve gear (up to engine -No. AGR 044 441 or AHF 006 065, respectively) => Fig.15-50.
• ◆ After installing the camshaft, wait for about 30 minutes before starting the engine. Hydraulic valve compensation elements have to settle (otherwise valves will strike pistons).
• ◆ After working on the valve gear, turn the engine carefully at least 2 rotations to ensure that none of the valves make contact when the starter is operated.
• ◆ The following illustration shows the cylinder head with light valve gear (as of engine-No. AGR 044 442 or AHF 006 066, respectively as well as all ALH and ASV engines).

• Bearing cap
• ◆ Installation position
  => Fig.15-50
• ◆ Installation sequence
  , Removing and installing camshaft
• 20 Nm
• Camshaft
• ◆ Checking axial clearance
  .
• ◆ Removing and installing
  .
• ◆ Checking radial clearance with Plastigage
  Wear limit: 0.11 mm
• ◆ Run-out: no more than 0.01 mm
• ◆ Valve timing => from page 00-2

• Hydraulic bucket tappet
• ◆ Checking => Page 15-62
• ◆ Removing and installing
  .
• ◆ Do not interchange
• ◆ Store with cam contact surface downwards
• ◆ Before installing check camshaft axial clearance
  .
• ◆ Oil contact surface
• Valve cotters
• Upper valve spring bracket
• Valve springs
• ◆ only one valve spring per valve for light valve gear
• ◆ Valve springs for old valve gear => Fig.15-50
• ◆ Removing and installing with cylinder head installed
  .
• ◆ Removing and installing with cylinder head removed with 2037

• Valve stem seal
• ◆ Replacing => Page 15-65.
• Valve guide
• ◆ Checking => Page 15-77
• ◆ When exceeding wear limit replace cylinder head
• Sealing ring
• ◆ To remove and install, remove bearing cap and toothed belt sprocket
• ◆ Removing and installing toothed belt => Page 13-23
• Cylinder head
• ◆ Checking valve guides
  .
• ◆ Rework valve seats
  .
• Valve
• ◆ Do not rework only grinding in is permitted
• ◆ Valve dimensions
  => Fig.15-51

→ Fig. 1    Location of camshaft bearing cap

Note offset. Before installing camshaft fit bearing caps and determine installation position.

→ Fig.2    Old valve gear (up to engine-No. AGR 044 441 or AHF 006 065, respectively)

•     1 -    Lower valve spring plate
•     2 -    Valve stem seal
•     3 -    Inner valve spring
•     4 -    Outer valve spring
•     5 -    Upper valve spring plate
•     6 -    Valve cotters
•     7 -    Hydraulic tappet

→ Fig.3    Valve dimensions

Note:

Valves must not be reworked. Only grinding in is permitted.