Installing 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.
CAUTION:
Improper routing of the positive battery cable
.
Risk of short circuits!
Risk of short circuits!
- Route the positive battery cable without abrasions and do not trap.
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.
- Drain the oil chamber in the chain tensioner when reusing the chain tensioner.
- Place the chain tensioner on a level support, slowly compress in the arrow direction and relieve it.
- Catch and dispose of emerging engine oil.
- Repeat process twice.
- Replace the sealing sleeve (1).
Parts: Sealing sleeve
- Guide in and install the sealing sleeve (1) on the chain tensioner (2).
- Guide in and install the chain tensioner (1).
- Prepare the commercially available tool.
Number Description 1 Torque wrench 2 Wrench socket set SW19 3 Reduction from 1/2 inch to 3/8 inch - Tighten chain tensioner (2) with commercially available tools (1).
TIGHTENING TORQUE SPECIFICATIONS
| Chain tensioner to cylinder head | ||
|---|---|---|
| Chain tensioner | Joining torque | 20 Nm |
| Angle of rotation | 40° | |
- Feed in and position the positive battery cable (2).
- Tighten nut (1).
TIGHTENING TORQUE SPECIFICATIONS
| Battery positive lead to battery positive terminal | ||
|---|---|---|
| M8 | Tightening torque | 19 Nm |
- Feed in and install the cover (2) in arrow direction.
The locks (1) must engage audibly.
Follow-up work
- Refer to INSTALLING THE LAMBDA OXYGEN SENSOR FOR THE CYLINDERS 4 TO 6 .
- Refer to INSTALLING THE HOLDER OF THE POSITIVE BATTERY CABLE .
- Refer to PARTIALLY INSTALLING THE COOLANT EXPANSION TANK OF THE HIGH-TEMPERATURE COOLANT CIRCUIT .
- Refer to INSTALLING THE RIGHT INTAKE FILTER HOUSING (FRONT-END STRUT REMOVED) .
- Refer to INSTALLING THE FRONT-END STRUT .
- Refer to INSTALLING ACOUSTIC COVER .
- Refer to INSTALLING THE STRUT BRACE .
- Refer to INSTALLING THE FRONT HOOD SEAL .
- Refer to CONNECTING ALL BATTERY GROUND LEADS .
- Refer to TAKING HOOD OUT OF THE SERVICE POSITION .