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Valve gear > < Installing cylinder head

A4 Mk1

Checking compression
Checking compression
Special tools and workshop equipment required
   
t  U/J extension and socket, 10 mm -3220-
  W00-0329
t  Compression tester -V.A.G 1763- with adapter -V.A.G 1763/5-
Test conditions
l  Engine oil temperature min. 30 °C.
l  Battery voltage at least 12.5 V
  W00-0563
Procedure
–  Detach caps on engine cover panel.
–  Unbolt and remove engine cover panel -arrows-.
–  Unplug electrical connector at injection pump.
–  Remove all glow plugs → Rep. Gr.28.
  A10-0202
–  Screw in adapter -V.A.G 1763/5- in place of the glow plug in each cylinder.
  Note
Using the compression tester → operating instructions.
–  Have a 2nd mechanic operate starter until tester shows no further pressure increase.
–  Repeat procedure on each cylinder.
  A15-0276
Compression pressurebar
When new27 … 33
Wear limit24
Maximum difference between cylinders5

Assembling
Installation is carried out in the reverse order; note the following:
–  Install glow plugs → Rep. Gr.28.
–  Faults are stored in engine control unit because electrical connectors were unplugged and the engine was started: “Interrogate fault memory” in “Vehicle self-diagnosis” → Vehicle diagnosis, testing and information system VAS 5051.
   

Valve gear > < Installing cylinder head