Compression Check: Testing and Inspection

Compression pressures, checking





Special tools and equipment
^ 3122 B Spark plug wrench
^ T10112 Removal tool
^ V.A.G. 1331 Torque wrench (5...50 Nm)
^ V.A.G. 1763 Compression tester

Test conditions
^ Engine oil temperature must be at least 30°C.
^ Voltage supply OK.

Work sequence
^ Remove engine cover.





^ Disconnect 6-pin connector from ignition coil with final output stage (arrow).





^ Remove fuse No. 32 from fuse holder.

Note: Removing the fuse interrupts the voltage supply to the injectors.





^ Disconnect connectors from outer injectors.
^ Pull spark plug connectors off with tool T10012.
^ Remove spark plugs with spark plug wrench 3122B.
^ Check compression pressures using compression tester V.A.G 1763 and adapter V.A.G 1763/6.

Note: Using the compression tester, Refer to Operating instructions.

^ Use a second mechanic to operate starter motor.
^ Operate starter until tester shows no further pressure increase.

Compression pressure values
New: 10...13 bar
Wear limit: 7.5 bar
Permissible difference between all cylinders: 3 bar
^ Check DTC memory, repair malfunctions if necessary and then erase DTC memory.