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A3 Mk2

Checking compression
   
Checking compression
Special tools and workshop equipment required
t  Spark plug socket and extension -3122 B-
t  Compression tester -V.A.G 1763-
t  Puller -T10095 A-
t  Assembly tool -T10118-

   
Procedure
l  Engine oil temperature at least 30 °C.
l  Battery voltage at least 12.5 V.
–  Switch off ignition.
–  Open lid of electronics box in engine compartment and remove injector fuse -29-.
  A97-0973
–  Detach electrical connectors at ignition coils by releasing tab -arrow- with assembly tool -T10118- and carefully pulling connector.
  N24-1533
–  Attach puller -T10095 A- to ignition coils as shown in illustration -arrow- and remove ignition coils one at a time.
–  Remove spark plugs with spark plug socket -3122 B-.
–  Test the compression pressure with the compression tester -V.A.G 1763-.
  Note
Using the compression tester → Operating instructions.
–  Have a 2nd mechanic press down the accelerator pedal completely and simultaneously operate the starter until the pressure no longer increases on the tester display.
  N28-0274
Compression pressurebar
When new10.0 … 13.0
Wear limit7.5
Maximum difference between cylinders3.0

Assembly is carried out in the reverse order; note the following:
–  Install spark plugs → Booklet808.
–  When finished, interrogate and erase the engine control unit fault memory, as faults are stored when fuses are removed and connectors are detached → Vehicle diagnosis, testing and information system VAS 5051.
   

Chain drive > < Installing cylinder head