Audi Workshop Service and Repair Manuals

Notes:

• ◆ Cylinder heads which have cracks between the valve seats or between valve seat inserts and the spark plug thread can be used further without reducing service life, provided the cracks do not exceed a maximum of 0.3 mm in width, or when no more than the first 4 turns of the spark plug threads are cracked.
• ◆ After installing new tappets the engine must not be started for about 30 minutes (otherwise valves will strike pistons). Turn crankshaft two complete revolutions before starting.
• ◆ Carefully apply a small amount of sealant at the four end points of the sealing surfaces on the cylinder head, using a small screwdriver=>Fig.1.

Sealant

=> Parts Catalogue

• Double bearing cap
• ◆ Lightly coat with sealant before installing=>from Page 15-15
• Exhaust camshaft bearing cap
• ◆ With connection for oil feed pipe
• ◆ Watch position of dowel sleeve
• ◆ Note installation position and
  numbering
• ◆ Lightly coat last bearing cap (after the chain) with sealant before installing
• 10 Nm

• Exhaust camshaft
• ◆ Checking axial clearance
  
• ◆ Removing and installing
  =>Page15-72
• ◆ Check radial clearance with
  Plastigage (tappets removed)
  Wear limit: 0.1 mm
  Run-out: 0.01 mm (maximum)
• Cap
• ◆ Renew

• Inlet camshaft bearing cap
• ◆ With connection for oil feed pipe
• ◆ Note installation position and
  numbering
• Inlet camshaft
• ◆ Checking axial clearance
  
• ◆ Removing and installing
  
• ◆ Check radial clearance with
  Plastigage (tappets removed)
  Wear limit: 0.1 mm
  Run-out: 0.01 mm (maximum)
• Drive chain
• ◆ Installing => Page 15-72

• 10 Nm
• Mechanical camshaft adjuster
• ◆ With camshaft adjustment valve -N205
• ◆ Secure with special tool 3366 before removing => Page 15-72
• Hydraulic bucket tappet
• ◆ Notes => Page 15-85
• ◆ Removing and installing with cylinder head installed => Page 15-72
• Valve cotters
• Valve spring plate
• Valve spring

• Valve stem seal
• ◆ Renewing with cylinder head
  installed => Page 15-87
• Rubber/metal gasket
• ◆ Renew
• Seal
• ◆ Renew
• Cylinder head
• ◆ Checking for distortion => Page 15-55
• ◆ Reworking => Page 15-55
• Exhaust valve
• Inlet valve
• Oil seal (Hall sender end)
• ◆ Renew => Page 15-9

• Rotor for Hall sender
• ◆ Note position (notch on camshaft)
• Washer
• ◆ Conical
• 25 Nm
• Hall sender
• 10 Nm
• 55 Nm
• ◆ Renew
• Camshaft sprocket
• Oil seal (toothed belt end)
• ◆ Renewing => Page 15-9

→ Fig.1    Sealing end points of joints between bearing caps and cylinder head

Carefully apply a small quantity of sealant at the four end points of the sealing surfaces on the cylinder head -arrows-, using a small screwdriver.

Sealant

=> Parts Catalogue