Engine - Compression/Cylinder Leakage Testing
SI B 11 13 06Engine
January 2008
Technical Service
This Service Information bulletin supersedes SI B 11 13 06 November 2006.
[NEW] designates changes to this revision.
SUBJECT:
N54 Engine Compression and Cylinder Leakage Test Procedures
MODEL
[NEW] E82 and E88 (1 Series), all models with N54 engine
[NEW] E90, E92 and E93 (3 Series), all models with N54 engine
[NEW] E60 and E61 (5 Series), all models with N54 engine
[NEW] INFORMATION
The special tools that are specified in TIS Repair Instruction RA 11 00 039 (Checking compression in all cylinders) are not available at this time. Until the tools are available, please follow one of the procedures described below when checking compression and/or cylinder leakage on the N54 Bi-Turbo engine. These special tools will be shipped to all centers via the Automatic Tool Shipment Program when available.
CHECKING ENGINE COMPRESSION USING PRESET MEASUREMENTS
Special tools required:
^ DIS Plus or GT1 with MIB
^ Diagnostic Head
^ TD Cable
^ 1000 Amp current probe.
The vehicle must be at operating temperature.
A cylinder compression test probe is not used for this test.
1. Remove the cowl assembly.
2. Remove the engine cover to access the fuel injectors.
3. [NEW] Remove the fuse that supplies power to the EKP module. Refer to the correct ETM Schematic for each specific vehicle to determine the proper fuse number.
4. Start the engine and let it run until it stalls.
5. Remove the electrical connectors from all 6 injectors.
6. Connect the battery charger.
7. Connect the diagnostic head to the vehicle with the TD cable connected.
8. Select "Preset Measurements".
9. Select "Relative Compression".
10. Engine selection - select "Other Engines".
11. Select"OK".
12. Current Probe Calibration - select "OK" and connect the current probe.
13. Ignition Type Selection - select "Static Ignition".
14. Selection of Number of Cylinders - select "6".
15. The Oscilloscope will now appear.
16. Connect the 1000 Amp clamp.
17. Crank the engine for approximately 10 seconds. The HOLD button will automatically highlight, indicating that the test is complete.
18. Print the results and place a copy in the vehicle file.
All cylinder compression values should be above 95% when using the Relative Compression test.
CHECKING ENGINE COMPRESSION USING THE SNAP ONREG; GAUGE SET
Using the standard Snap On(R) Compression gauge set with the Snap On(R) 12 mm EEPV306A screw in the compression adaptor:
The vehicle must be at operating temperature.
1. Remove the cowl assembly.
2. Remove the engine cover to access the fuel injectors.
3. [NEW] Remove the fuse that supplies power to the EKP module. Refer to the correct ETM Schematic for each specific vehicle to determine the proper fuse number.
4. Start the engine and let it run until it stalls.
5. Remove the electrical connectors from all 6 injectors.
6. Remove all coils and spark plugs.
7. Starting with cylinder number one, screw in the EEPV306A adaptor and connect the compression gauge.
8. Connect the battery charger.
9. Actuate the starter until the compression stops rising
10. Repeat steps 7 and 8 for all remaining cylinders.
11. Record all values and compare to the specification.
TIS Technical Data Compression Specification
WARRANTY INFORMATION
Information only
Disclaimer