volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

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Valve gear > < Removing and installing cylinder head

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 -T10112 A-

Test prerequisite
l  Engine oil temperature must be at least 30°C.
Procedure
   
–  Pull spark plug connectors -arrows- out with puller -T10112 A-.
–  Unscrew spark plugs with spark plug spanner -3122 B-.
–  Remove fuse for fuel pump control unit 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 25 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.
  N15-10576

Valve gear > < Removing and installing cylinder head