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Valve gear > < Removing and installing cylinder head

A4 Mk3

Checking compression
Checking compression
Special tools and workshop equipment required
   
t  Spark plug socket and extension -3122 B-
  W00-0060
t  Compression tester -V.A.G 1763-
Test sequence
  Note
t  Engine oil temperature at least 30 °C
t  Battery voltage at least 12.7 V
  W00-0563
–  Remove engine cover panel -arrows-.
  A10-11547
–  Detach electrical connector for Lambda probe -1- from retainer.
–  Release electrical connectors at ignition coils and unplug from ignition coils simultaneously.
–  Remove bolts for ignition coils and pull out ignition coils.
–  Remove spark plugs with spark plug spanner -3122 B-.
–  Check compression pressure with compression tester -V.A.G 1763- and adapter -V.A.G 1763/6-.
  Note
Using the compression tester → Operating instructions.
–  Operate starter until pressure reading on tester no longer rises.
Compression pressure:
  A24-11099
New pressure in barWear limit in barPermissible difference between cylinders in bar
11.0 ... 14.07.03.0 (maximum)

–  Install spark plugs; A4 → Booklet812, A5 → Booklet811.
–  Install ignition coils with output stages → Rep. gr.28.
  Note
Faults will have been stored in the memory because connectors have been unplugged. Interrogate and, if necessary, erase event memory after completing the check.
–  Read out event memory of engine control unit → vehicle diagnostic, testing and information system VAS 5051 in the "Guided Fault Finding" function.
   

Valve gear > < Removing and installing cylinder head