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Servicing valve gear - engine code letters AKE, AYM, BFC > < Installing cylinder head

A4 Mk2

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 at least 30 °C
l  Battery voltage at least 12.5 V
  W00-0563
Test sequence
–  Pull off engine cover panel -arrows-.
–  Unplug electrical connector at injection pump.
–  Detach electrical connectors at glow plugs.
  A34-0371
–  Unscrew all glow plugs using U/J extension and socket, 10 mm -3220-.
–  Screw in adapter -V.A.G 1763/5- in place of the glow plug in each cylinder.
–  Test the compression pressure with the compression tester -V.A.G 1763-.
  Note
Using the compression tester → operating instructions.
–  Have a 2nd mechanic operate starter until tester shows no further pressure increase.
Compression pressure:
  A15-0276
Engine code lettersNew
pressure in bar		Wear limit
bar		Permissible difference between cylinders
bar
AKE, AYM, BAU, BCZ, BFC26 … 29195 (maximum)
BDG, BDH24 … 27175 (maximum)

Installation is carried out in the reverse order; note the following:
–  Install glow plugs → Rep. Gr.28.
–  Interrogate and erase the fault memory for engine control unit, as faults are stored when the electrical connectors are unplugged → Vehicle diagnosis, testing and information system VAS 5051.
   

Servicing valve gear - engine code letters AKE, AYM, BFC > < Installing cylinder head