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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Adjusting Camshaft Timing On Left Side (N62/N62TU)
Special tools required:
11 9 190
11 9 460
11 9 461
11 9 462
11 9 463
(cylinder bank 5 to 8)
Necessary preliminary tasks:
Check camshaft timing on left side.
Remove left timing case cover.
NOTE: When slackening screws, grip camshafts at hexagon head.
Slacken screws of exhaust and inlet ad
Opening Plug Housings And Removing Contacts Of Different Plug
Systems
Special tools required:
61 0 300
61 0 400
61 1 150
Abbreviations and what they mean:
ABBREVIATIONS MEANINGS
Ultrasonic-welded connectors:
Ultrasonic-welded connectors (1) can be identified by the welds (2) on their
longitudinal side.
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