Checking all cylinders for loss of pressure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 BMW X2, 2022 BMW X2, 2021 BMW X2, 2020 BMW X2, and 2019 BMW X2. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
RISK OF DAMAGE
Damage to the engine .
If the engine is manually rotated in the wrong direction of rotation, the engine can be damaged .
Damage to the engine .
If the engine is manually rotated in the wrong direction of rotation, the engine can be damaged .
- Only rotate the engine manually in the correct direction of rotation: a) clockwise when looking at the damper, or b) counterclockwise when looking at the chain drive. b) applies only if the timing chain is installed in the rear.
NOTE:
TECHNICAL INFORMATION
The OT finder from the special tool 2 302 630 absolutely must be vertical, otherwise the measurement result can be falsified.
The OT finder from the special tool 2 302 630 absolutely must be vertical, otherwise the measurement result can be falsified.
NOTE:
TECHNICAL INFORMATION
Before the loss of pressure of the cylinders is checked, the special tool 2 302 630 must be adjusted or calibrated.
Before the loss of pressure of the cylinders is checked, the special tool 2 302 630 must be adjusted or calibrated.
NOTE:
The description is provided only at one cylinder. The procedure is the same for all other cylinders.
Preliminary work
- Refer to REMOVING THE ACOUSTIC COVER .
- Refer to IF INSTALLED: PARTIALLY REMOVING THE ENGINE VENTILATION LINE .
- Refer to REMOVING IGNITION COILS .
- Refer to REMOVING ALL SPARK PLUGS .
- Refer to REMOVING FRONT RIGHT WHEEL .
- Refer to REMOVING THE FRONT RIGHT WHEEL ARCH COVER .
Special tool 2 302 630
NOTE:
RISK OF DAMAGE
Damage to the engine .
If the engine is manually rotated in the wrong direction of rotation, the engine can be damaged .
Damage to the engine .
If the engine is manually rotated in the wrong direction of rotation, the engine can be damaged .
- Only rotate the engine manually in the correct direction of rotation: a) clockwise when looking at the damper, or b) counterclockwise when looking at the chain drive, b) applies only if the timing chain is installed in the rear.
NOTE:
TECHNICAL INFORMATION
Before the loss of pressure of the cylinders is checked, the special tool 2 302 630 must be adjusted or calibrated.
Before the loss of pressure of the cylinders is checked, the special tool 2 302 630 must be adjusted or calibrated.
NOTE:
The description is provided only at one component. The procedure is the same for all other components.
- Keep set of special tools 2 302 630
at hand:
Number Description 1 Pressure gauge 2 OT Finder 3 Adapter for the spark plug thread (60) 4 Adapter for the spark plug thread - Have the special tool 0 493 380 (11 6 480) 2 468 560
ready.
- Have the adapter for the spark plug thread (60) (1) ready.
- Screw in the adapter for the spark plug thread (60) (1) into the spark plug thread by hand.
- Tighten the adapter for the spark plug thread (60) (1) with a standard tool (2).
- Connect the OT finder (1) to the adapter for the spark plug thread (60) (2).
The OT finder (1) must engage audibly.
NOTE: TECHNICAL INFORMATION
The OT finder from the special tool 2 302 630 absolutely must be vertical, otherwise the measurement result can be falsified. - Fit special tool 0 493 380 (11 6 480) .
- Turn the engine by hand with the special tool 0 493 380 (11 6 480)
.
If the piston goes upwards, the bubble level (2) in the cylinder tube (1) also goes upward in the arrow direction .
- Turn the piston to TDC
.
At TDC, both the piston and bubble level (2) are at the highest point in the cylinder tube (1).
» Valves are closed.
NOTE: TECHNICAL INFORMATION
Before the loss of pressure of the cylinders is checked, the special tool 2 302 630 must be adjusted or calibrated. - Connect the quick-release coupling (1) to the valve block (2) of the pressure gauge in the arrow direction
.
The quick-release coupling (1) must engage audibly.
- Connect the compressed air hose (1) to the valve block (2) of the pressure gauge in the arrow direction
.
The compressed air hose (1) must engage audibly.
- Unlock the pressure control valve (1) in the arrow direction
.
- Turn the pressure control valve (1) in the arrow direction
until the needle (2) of the pressure gauge is at 22%.
- Lock the pressure control valve (1) in the arrow direction
.
The pressure control valve (1) must engage audibly.
- Unlock and release the quick-release coupling (2) on the valve block of the pressure gauge (2) in the arrow direction
.
- Connect and lock the quick-release coupling (1) of the pressure gauge to the adapter for the spark plug thread (60) (2).
The quick-release coupling (1) of the pressure gauge must engage audibly.
Check
NOTE:
The description is provided only at one cylinder. The procedure is the same for all other cylinders.
- Read off the loss of pressure; the needle (1) of the pressure gauge must be within the green area of 0-22%.
Result
» The needle (1) of the compressed air pressure gauge is in the green area of 0-22%.
Measure
- Assemble engine.
Check
- Read off the loss of pressure. The needle (1) of the pressure gauge must be within the green area of 0-22%.
Result
» The needle (1) of the compressed air pressure gauge is not in the green area of 0-22%.
Measure
- Check possible fault causes and for a piston ring leak (crankcase ventilation) at the intake valves (intake port) or exhaust valves (exhaust system).
Follow-up work
- Refer to INSTALLING ALL SPARK PLUGS .
- Refer to INSTALLING THE IGNITION COILS .
- Refer to IF INSTALLED: PARTIALLY INSTALLING ENGINE VENTILATION LINE .
- Refer to INSTALLING THE FRONT RIGHT WHEEL ARCH COVER .
- Refer to INSTALLING THE FRONT RIGHT WHEEL .
- Refer to INSTALLING ACOUSTIC COVER .