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Engine lubrication > < Renewing valve stem seals

Leon Mk1

Checking compression
   
Checking compression
Special tools and workshop equipment required
t  Spark plug spanner -3122 B-
t  Torque wrench -V.A.G 1331- (5...50 Nm)
t  Compression tester -V.A.G 1763- with adapter -V.A.G 1763/6-

Test prerequisites
l  Engine oil temperature must be at least 30 °C.
l  The battery voltage must be at least 11.5 V.
l  All electrical consumers, e.g. lights and rear window heating, must be switched off.
l  If the vehicle is equipped with an air conditioner, it must be switched off.
Test procedure
–  Remove fuse no. 14 out of fuse holder.
   
Fuse holder in vehicles with engine code AJH.
  N19-0204
Fuse holder in vehicles with engine code AWC.
  Note!
Removing fuse no. 14 interrupts the voltage supply to the injectors.
–  Remove ignition coils with output stages → Rep. Gr.28.
–  Unscrew spark plugs using spark plug socket and extension -3122 B-.
–  Have a second mechanic operate the starter. (Additionally depress accelerator pedal fully in vehicles with engine code AJH.)
–  Check compression using compression tester -V.A.G 1763- and adapter -V.A.G 1763/6-.
  Note!
Using compression tester → operating instructions.
–  Operate starter until tester shows no further pressure increase.
Compression pressures:
New: 10...13 bar, wear limit: 7.0 bar
Permissible difference between all cylinders: max. 3 bar
–  Insert spark plugs using spark plug spanner -3122 B- and tighten to 30 Nm.
–  Install ignition coils and tighten to 10 Nm.
Vehicles with engine code AJH
–  Interrogate and erase fault memory → Rep. Gr.01
Vehicles with engine code AWC
–  Interrogate and erase fault memory → Rep. Gr.01
  N01-0485

Engine lubrication > < Renewing valve stem seals