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Repairing Valve Gear > < Removing and installing cylinder head for engine with engine identification characters BMM|Install

Octavia Mk2

Testing compression pressure for engine with engine identification characters BMM
Testing compression pressure for engine with engine identification characters BMM
Special tools and workshop equipment required
t  Compression tester, e.g. -V.A.G 1763-
t  Adapter, e.g. -V.A.G 1381/12-
t  Flexible-head wrench e.g. -3220-
Test conditions
l  Engine oil temperature at least 30°C
Test sequence
–  Remove engine cover → Chapter.
–  Detach central plug connection for unit injectors and edge connector for glow plugs.
–  Unscrew all glow plugs with flexible-head wrench.
   
–  Screw the adapter, e.g. -V.A.G 1381/12-, in place of the glow plug into the relevant cylinder.
–  Test compression with compression tester, e.g. -V.A.G 1763-
  Note
Use of tester → Operating Instructions.
–  The 2nd mechanic operates the starter until the tester no longer indicates a pressure rise.
Compression readings
  S15-0448
newWear limitpermissible difference between cylinders
OverpressureOverpressureOverpressure
2.5…3.1 MPa1.9 MPamaximum 0.5 MPa
25…31 bar19 barmaximum 5 bar

Perform after the compression pressure test:
–  Install glow plugs and tighten to 15 Nm.
–  Connect central plug connection for unit injectors and edge connector for glow plugs.
–  Then interrogate the fault memory of engine control unit and erase → Vehicle diagnosis, testing and information system VAS 5051.
   

Repairing Valve Gear > < Removing and installing cylinder head for engine with engine identification characters BMM|Install