Audi Workshop Service and Repair Manuals

Notes:

• ◆ Cylinder heads with cracks between valve seats can still be used without a reduction of service life, if cracks are slight, max. 0.5 mm wide.
• ◆ 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.
• ◆ Renew all gaskets and seals.
• ◆ Note current specifications when using sealant:

=> Parts List

• Cylinder head
• ◆ See note
  
• ◆ Checking valve guides, grinding in valve seats
  => Page 15-60
• ◆ Rework valve seats
  => Page 15-57
• Sealing ring
• ◆ Remove, to remove and install bearing cap and remove toothed belt sprocket
• ◆ Removing and installing toothed belt=> Page 13-43
• Camshaft sprocket
• ◆ Remove toothed belt before removing and installing => Page 13-43
• ◆ Release from camshaft taper by tapping with a hammer, using a drift through hole of toothed belt guard

• 45 Nm
• ◆ Counter hold with 3036 to loosen and tighten
• 20 Nm
• Bearing cap
• ◆ Installation position => Fig.1
• ◆ Installation sequence
  => Page 15-44, Removing and installing camshaft
• ◆ Before installing thin coat bearing cap 1 on contact surface with "D 454 300 A2"
• ◆ Sealing points
  => Fig.15-7

• Camshaft
• ◆ Check axial clearance
  => Page 15-43
• ◆ Removing and installing
  => Page 15-44
• ◆ Checking radial clearance with Plastigage
  Wear limit: 0.11 mm
• ◆ Run-out: no more than 0.01 mm
• ◆ Valve timings => from Page 00-2
• Hydraulic bucket tappet
• ◆ Checking => Page 15-51
• ◆ Removing and installing
  => Page 15-54
• ◆ Do not interchange
• ◆ Store with cam contact surface downwards
• ◆ Before installing check camshaft axial clearance
  => Page 15-43
• ◆ Oil contact surface

• Valve cotters
• Upper valve spring retainer
• Valve spring, outer
• ◆ Removing and installing:
  Cylinder head
  removed: with 2037
  installed: => Page 15-54
• Valve spring, inner
• ◆ Removing and installing:
  Cylinder head
  removed: with 2037
  installed: => Page 15-54
• Valve stem seal
• ◆ Replacing => Page 15-54
• Valve guide
• ◆ Checking => Page 15-60
• ◆ Replace cylinder head if wear limit exceeded

• Lower valve spring retainer
• ◆ Remove and install with puller 3047 A
• Valve
• ◆ Do not rework only grinding in is permitted
• ◆ Valve dimensions => Fig.2

→ Fig.1    Installation position of camshaft bearing cap

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

→ Fig.2    Valve dimensions

Note:

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