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Volkswagen Workshop Service and Repair Manuals

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Golf Mk5

Checking compression
Checking compression
  Note
If ceramic glow plugs are fitted, before removing check idling speed smooth running control using vehicle diagnosis, testing and information system -VAS 5051B-. The compression test is only justified if one or more cylinders are conspicuous.
   
Special tools and workshop equipment required
t  Jointed spanner -3220-
t  Torque wrench -V.A.G 1331-
t  Adapter -V.A.G 1381/12-
t  Compression tester -V.A.G 1763-

Test prerequisite
l  Engine oil temperature min. 30 °C.
Test procedure
–  Pull off central connector for unit injectors.
  Note
If ceramic glow plugs are fitted, always observe notes on removing and installing ceramic glow plugs → Chapter.
–  Remove all glow plugs or ceramic glow plugs using jointed extension and socket -3220-.
   
–  Screw in adapter -V.A.G 1381/12- in place of glow plugs or ceramic glow plugs.
–  Check compression using compression tester -V.A.G 1763-.
  Note
Using the compression tester ⇒ Operating instructions.
–  Operate starter until tester shows no further pressure increase.
Compression pressures:
New: 25 … 31 bar, wear limit: 19 bar
Maximum permissible difference between all cylinders: 5 bar
  Note
If ceramic glow plugs are fitted, always observe notes on removing and installing ceramic glow plugs → Chapter.
–  Remove glow plugs or ceramic glow plugs using jointed extension and socket -3220-.
Specified torque: 15 Nm.
–  Read fault memory of engine control unit → Chapter.
  Note
Disconnecting the central connector for unit injectors causes faults to be stored. Therefore, read fault memory and clear if necessary.
  N15-0227

Valve gear > < Installing