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Valve gear > < Installing cylinder head

A4 Mk1

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-
  W00-0563
Procedure
l  Engine oil temperature min. 30 °C
l  Battery voltage at least 12.5 V
–  Release quick-release fasteners and remove engine cover panel -arrows-.
  A10-0661
–  Unplug electrical connectors -3-.
–  Remove ignition coils -1-.
–  Remove spark plugs with spark plug socket and extension -3122 B-.
–  Unplug electrical connectors at injectors.
–  Check compression pressure with compression tester -V.A.G 1763- (see → operating instructions for details of how to use tester).
–  Have a 2nd mechanic press down the accelerator pedal completely and at the same time operate the starter until the pressure on the tester display no longer increases.
–  Repeat procedure on each cylinder.
  A15-0552
Compression pressurebar
When new10.0 … 13.0
Wear limit7.0
Maximum difference between cylinders3.0

Assembling
Installation is carried out in the reverse order; note the following:
–  Install spark plugs → Booklet802.
–  Faults are stored in engine control unit because electrical connectors were unplugged and engine was started: “Generate readiness code” in “Guided Functions” → Vehicle diagnosis, testing and information system VAS 5051.
Tightening torque → Chapter
   

Valve gear > < Installing cylinder head