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Repairing valve gear > < Adjusting valve timing

Golf Mk4

Checking compression
   
Checking compression
Special tools and workshop equipment required
t  Spark plug spanner -3122 B-
t  Torque wrench -V.A.G 1331-
t  Compression tester -V.A.G 1763-
t  Puller -T10095 A-

Test prerequisite
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 vehicle is equipped with air conditioner, this must be switched off.
Test procedure
   
–  Remove fuse no. 28 out of fuse holder.
  Note
Removing fuse no. 28 interrupts the voltage supply to the injectors.
–  Remove engine cover.
–  Pull out ignition coils with output stages using puller -T10095 A-.
–  Remove spark plugs using spark plug socket and extension -3122 B-.
–  Check compression using compression tester -V.A.G 1763-.
  Note
Using compression tester ⇒ Operating instructions.
–  Operate starter until tester shows no further pressure increase.
Compression pressures:
New: 10...13 bar
Wear limit: 7.5 bar
Maximum permissible difference between all cylinders: 3 bar
–  Insert spark plugs using spark plug socket and extension -3122 B- and tighten to 30 Nm.
  N24-0588

Repairing valve gear > < Adjusting valve timing