Compression Check: Testing and Inspection

11 00 039 - Checking compression of all cylinders (S85)





Special tools required:
- 11 0 224 11 0 220 Compression Test Kit
- 11 0 235 11 0 220 Compression Test Kit





Important!
High tension - mortal danger!

Disconnect all supply leads from ignition coils (interrupt power supply to ignition coils).

Check Schrader valve on special tool 11 0 235 11 0 220 Compression Test Kit for correct seating (engine damage).

The throttle valves cannot be opened by opening the throttle.

A compression check is carried out exclusively by means of the idle actuators.

A compression check is only possible with the diagnosis tester.





Necessary preliminary tasks:
- Remove microfilter housing Removing and Installing/Replacing Left or Right Microfilter Housing Lower Section.
- Release coolant tank and place to one side
- Remove all spark plugs Service and Repair.
- Connect diagnosis tester.
-
-1. - Service function.
2. - Drive.
3. - Engine electronics
4. - Switch off fuel injection.

Important!
Fuel injectors are switched off.

5. - Actuate starter motor for 8 seconds.





Screw special tool 11 0 235 11 0 220 Compression Test Kit into spark plug hole.

Check that sealing ring is in perfect condition on special tool 11 0 235 11 0 220 Compression Test Kit.

Connection (1) for diagnosis tester or special tool 11 0 224 11 0 220 Compression Test Kit.





Connect special tool 11 0 224 11 0 220 Compression Test Kit or 25 bar pressure adapter to diagnosis tester.

Compression pressure Engine in General S85.





Now clear the fault memory.