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Volkswagen Workshop Service and Repair Manuals

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Valve gear > < Installing

Polo Mk5

Checking compression
   
Checking compression
Special tools and workshop equipment required
t  Spark plug socket and extension -3122 B-
t  Torque wrench (5…50 Nm) -V.A.G 1331-
t  Compression tester -V.A.G 1763-
t  Puller -T10094-

Test prerequisite
l  Engine oil temperature must be at least 30 °C.
Procedure
–  Remove air filter housing (engine codes AUA, AUB, BBY, BBZ, BKY only) → Chapter
Engine codes AUA, AUB
–  Remove spark plug connectors together with ignition wiring guide.
–  Disconnect 4-pin connector from ignition transformer.
Engine codes BBY, BBZ, BKY, BUD and CGGB
–  Pull 4-pin connectors off ignition coils.
–  Remove ignition coils. Use puller -T10094- for this purpose.
–  Remove wiring guide from camshaft housing.
Continuation for all vehicles
–  Remove spark plugs using spark plug socket 3122 B.
–  Remove fuse for injection valves from fuse holder. 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.
Further assembly is basically the reverse of the dismantling sequence.
–  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.
   

Valve gear > < Installing