BMW X5: Workshop Hints On Cylinder Leakage Testing
When performing cylinder leakage tests, the following tips might be helpful:
Remove all spark plugs to allow easier rotation of the engine. (If this test is
done after a compression test, the
plugs should already be out).
- Perform the leakage test on all cylinders, not just the problem
cylinder. This would indicate any other
problems which can be rectified. This eliminates any repeat repairs and
wasted diagnostic time.
- Perform the leakage test in cylinder firing order starting with cylinder
#1. It takes two revolutions of the
engine to complete the leakage test. Start at cylinder #1 and rotate the
engine to the next cylinder in the
firing order. Divide the number of cylinders into 720, the result is the
number of degrees that each
cylinder fires. For example, if you divide a 6 cylinder into 720, this
equals 120 degrees. If you start at
cylinder 1 and rotate the engine 120 degrees in the direction of rotation,
you can check the next cylinder
in the firing order. This process eliminates the need to rotate the engine
an excessive amount.
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Fig. 4: Cylinder Leakage Testing Tips
Cylinder Arrangement And Firing Order
Front of Engine
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Fig. 5: Identifying Firing Order
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Principle
The Check Control system monitors functions in
the vehicle and notifies you of faults in the monitored
systems.
General information
A Check Control message is displayed as a combination
of indicator or warning lights and text
messages in the instrument cluster and, if applicable,
in the He
Danger of poisoning!
Ingesting oil or absorbing through the skin may cause poisoning!
Possible symptoms are:
Headaches
Dizziness
Stomach aches
Vomiting
Diarrhoea
Cramps/fits
Unconsciousness
Protective measures/rules of conduct:
Pour oil only into appropriately marked containers
Do not po