skoda Workshop Repair Guides

Skoda Workshop Service and Repair Manuals

ABOUT US
Testinf the combustion chamber for tightness > < Removing and installing the cylinder head

Fabia Mk2

Testing the compression
Testing the compression
Test condition
l  Oil temperature at least 30 °C
Special tools and workshop equipment required
t  Compression tester, e.g. -1763-
t  Spark plug wrench, e.g. -3122 B-
t  Extractor -T10094A-
t  Assembly device -T10118-
Test sequence
For vehicles Roomster with engine identification characters BME
–  If necessary remove engine cover with air filter → Chapter.
Continued for all vehicles
–  Disconnect the 4-pin plug connectors from the ignition coils with power output stage -N70-, -N127-, -N291- if necessary pull the ignition coils out slighty.
–  Pull out ignition coils with power output stage -N70 -, -N127-, -N291- with extractor -T10094A-.
–  Disconnect all plug connections of the injectors.
–  Unscrew the spark plugs.
–  Test compression with compression tester, e.g. -V.A.G 1763-
  Note
Use of tester → Operating Instructions.
–  Operate starter until the tester no longer indicates a pressure rise.
Compression readings
   
New engineWear limitDifference between cylinders
min. 15 bar (1,5 MPa)11 bar (1,1 MPa)max. 3 bar (0.3 MPa)

If the specified values are not reached, test the combustion chamber for tightness → Chapter.
–  Screw in the spark plugs and tighten to 30 Nm.
–  Install ignition coils with power output stage -N70-, -N127-, -N291-.
–  Plug in the plug connector for the ignition coils with the power output stage and the injectors.
For vehicles Roomster with engine identification characters BME
–  Install engine cover with air filter.
Continued for all vehicles
–  Interrogate fault memory and erase → Vehicle diagnostic tester.
  Note
Separating the plug connections causes faults to be stored.
   

Testinf the combustion chamber for tightness > < Removing and installing the cylinder head