BMW X5: Workshop Hints On Cylinder Leakage Testing
BMW X5 (G05) 2019-2025 Service & Repair Manual / Engine Diagnosis / 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.
.png)
Fig. 4: Cylinder Leakage Testing Tips
Cylinder Arrangement And Firing Order
Front of Engine
.png)
Fig. 5: Identifying Firing Order
READ NEXT:
Ignition System Diagnosis
The ignition system on modern BMW engines consist of one ignition coil per
cylinder. This arrangement is
known as RZV, or Direct Stationary Ignition. The ignition coil receives fused
power usually f
Fuel System Testing
Fuel systems need to be checked for proper fuel pressure as well as
sufficient volume. When diagnosing fuel
system complaints, you must take into account the type of fuel system and how
the fuel is
Fuel Volume Testing
Some driveability concerns are related to incorrect fuel volume. Vehicles
with lack of power complaints and
mixture related fault codes may have insufficient fuel volume supplied to the
fuel injecti
SEE MORE:
Removing And Installing Or Replacing Fuel Gauge Sensor (Petrol/Gasoline,
Right)
Recycling
Fuel escapes when fuel lines are detached. Have a suitable collecting
container ready.
Catch and dispose of escaping fuel.
Observe country-specific waste-disposal regulations.
IMPORTANT: Ensure adequate ventilation in the place of work!
Ensure absolute cleanliness when working on the ope
BMW Roadside Assistance
Principle
Contact the BMW Group Roadside Assistance if
assistance is needed in the event of a breakdown.
General information
In the event of a breakdown, data on the vehicle's
condition is transmitted to the BMW Roadside Assistance.
There are various ways of contacting BMW
Roadside Assistance.
Via
© 2019-2025 Copyright www.bmwx5info.com
