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.
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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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Front Lid
REMOVING AND INSTALLING HOOD/BONNET
WARNING: Danger of injury!
Support engine hood in fully opened position with suitable apparatus.
IMPORTANT: Removal of the hood/bonnet must be carried out with the
assistance of a
second person.
NOTE: Carry over schematic representation to the relevant vehicle ty
Replacing All Main Crankshaft Bearing Shells(N52K)
Special tools required:
00 2 590 PLASTIGAGE (5)
11 4 251
11 4 252
11 4 470
IMPORTANT: Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical
corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts mu
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