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Servicing valve gear > < Removing and installing intake manifold

A2

Checking compression
   
Checking compression
Special tools and workshop equipment required
t  U/J extension and socket, 10 mm -3220-
t  Torque wrench -V.A.G 1331-
t  Adapter -V.A.G 1381/12-
t  Compression tester -V.A.G 1763-

Procedure
l  Engine oil temperature at least 30 °C.
l  Battery voltage at least 12.5 V.
   
–  Take off engine cover panel -arrows-.
–  Remove noise insulation located below (detach crankcase breather hose).
  A10-1107
–  Unplug electrical connectors -2- on glow plugs.
–  Pull retaining tab and loosen knurled nut -3- at main connector for unit injectors.
  Note
Ignore other items.
–  Unscrew all glow plugs using jointed spanner -3220-.
  A10-1110
–  Screw in adapter -V.A.G 1381/12- in place of the glow plug in each cylinder.
–  Test the compression pressure with the compression tester -V.A.G 1763-.
  Note
Using the compression tester → Operating instructions.
–  Have a 2nd mechanic operate starter until tester shows no further pressure increase.
  N15-0292
Compression pressurebar
When new25.0 … 31.0
Wear limit19.0
Difference between cylinders5.0 (maximum)

Assembly is carried out in the reverse order; note the following:
–  Install glow plugs → Rep. Gr.28.
–  Interrogate and erase the fault memory for engine control unit, as faults are stored when the electrical connectors are unplugged → Vehicle diagnosis, testing and information system VAS 5051.
   

Servicing valve gear > < Removing and installing intake manifold