Removing chain tensioner
WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Working on 12 V electrical system
.
Risk of short circuits! Risk of fire!
Risk of short circuits! Risk of fire!
- Make sure that there is no charger connected to the jump start terminal in the engine compartment.
- Detach battery ground lead from battery.
- For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
WARNING:
Hot surfaces
.
Risk of burning!
Risk of burning!
- Perform all work only on components that have cooled down.
NOTE:
RISK OF DAMAGE
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS) .
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults .
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS) .
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults .
- Detach battery terminal from battery pole by carefully shifting to and fro. Do not pry off using a tool.
Preliminary work
- Refer to BRINGING FRONT COMPARTMENT LID IN THE SERVICE POSITION .
- Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
- Refer to REMOVING SEAL FOR FRONT HOOD .
- Refer to REMOVING SUSPENSION STRUT BRACE .
- Refer to REMOVING THE ACOUSTIC COVER .
- Refer to REMOVING THE FRONT-END STRUT .
- Refer to REMOVING THE RIGHT INTAKE FILTER HOUSING (FRONT-END STRUT REMOVED) .
- Refer to PARTIALLY REMOVING THE COOLANT EXPANSION TANK OF THE HIGH-TEMPERATURE COOLANT CIRCUIT .
- Refer to REMOVING THE HOLDER OF THE POSITIVE BATTERY CABLE .
- Refer to REMOVING LAMBDA OXYGEN SENSOR FOR THE CYLINDERS 4 TO 6 .
Precondition
Negative battery cable disconnected.
NOTE:
TECHNICAL INFORMATION
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.
- Unlock the locks (1).
- Feed out and remove the cover (2) in arrow direction.
- Release nut (1).
- Pull the positive battery cable (2) out and set it aside.
- Prepare the commercially available tool.
Number Description 1 1/2" torque wrench 2 Wrench socket set SW19 - A small amount of motor oil emerges when removing the chain tensioner (2), have a cleaning cloth ready.
- Release the chain tensioner (2) with standard tools (1).
- Thread the chain tensioner (1) out and remove.