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Roomster

Testing the compression
Testing the compression
  Note
t  A rough test of the compression pressure can be carried out in the targeted fault finding → Vehicle diagnostic tester.
t  The following work sequence with the compression tester gives more precise values.
Special tools and workshop equipment required
t  Flexible-head wrench SW 10 -3220-
t  Compression tester, e.g. -V.A.G 1763-
t  Adapter -V.A.G 1763/8-
Test condition
l  Engine oil temperature at least 80°C.
l  Battery voltage at least 12.5 V.
Test sequence
–  Remove engine cover → Chapter.
   
–  Disconnect the plug at the fuel pressure regulating valve -N276--arrow- on the fuel distributor.
–  Start engine briefly in order to reduce the pressure in the fuel distributor.
–  Remove all glow plugs → Chapter.
  A23-10578
–  Screw the adapter -V.A.G 1763/8- into the threaded hole of the glow plug on the cylinder to be checked and connect the compression tester -V.A.G 1763-.
  Note
Use of the compression tester -V.A.G 1763- → Operating instructions.
–  Operate the starter with the assistance of a 2nd mechanic until no further pressure rise is indicated by the compression tester -V.A.G 1763-.
–  Measure the compression pressure consecutively on all the cylinders.
  A15-11046
Compression readingsPressure
New engine2,5 ... 3.1 MPa (25.0 ... 31.0 bar)
Wear limit1,9 MPa (19,0 bar)
Max. permissible difference between the cylinders0,5 MPa (5,0 bar)

Installation is performed in the reverse order, pay attention to the following points:
–  Install the glow plug for the relevant cylinder → Chapter.
–  Interrogating and erasing fault memory of engine control unit → Vehicle diagnostic tester.
  Note
After deleting the fault memory of the engine control unit the readiness code must be re-generated.
   

Engine lubrication > < Valve gear