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Volkswagen Workshop Service and Repair Manuals

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Valve gear > < Adjusting valve timing

Polo Mk5

Checking compression
   
Checking compression
Special tools and workshop equipment required
t  Spark plug socket and extension -3122 B-
t  Torque wrench -V.A.G 1331-
t  Compression tester -V.A.G 1763-
t  Puller -T10094 A-

Test prerequisite
l  Engine oil temperature must be at least 30 °C.
Test procedure
   
–  Pull 4-pin connectors off ignition coils -arrows-.
–  Remove ignition coils off spark plugs using puller -T10094 A-.
–  Remove spark plugs using spark plug socket and extension -3122 B-.
–  Remove fuse for injectors. Fuse assignment → Current flow diagrams, Electrical fault finding and Fitting locations
–  Check compression using compression tester -V.A.G 1763-.
  Note
How to use the test unit is described in the respective operating instructions.
–  Operate starter until tester shows no further pressure increase.
Compression pressures:
New: 10…15 bar
Wear limit: 7 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.
–  Read fault memory, repair faults if necessary and then clear fault memory → Vehicle diagnostic tester„Guided fault finding“.
–  The readiness code must be generated if the fault memory has been erased.
  N15-0610

Valve gear > < Adjusting valve timing