Slackening the chain tensioner of cylinder bank 2
WARNING: This page is about a different car, the 2022 BMW X7, 2021 BMW X7, 2020 BMW X7, and 2019 BMW X7. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
RISK OF DAMAGE
Careless handling of tools and sharp-edged components. Scratches, surface damage .
Careless handling of tools and sharp-edged components. Scratches, surface damage .
- Protect working area.
- Handle tools and components carefully.
NOTE:
TECHNICAL INFORMATION
When the engine is stopped after the completion of trip, it may be necessary to run the electric fan. In rare cases, operation of the electric fan can last up to 11 min. This protects the components. In this case, replacing the electric fan will not remedy the problem!
When the engine is stopped after the completion of trip, it may be necessary to run the electric fan. In rare cases, operation of the electric fan can last up to 11 min. This protects the components. In this case, replacing the electric fan will not remedy the problem!
Preliminary work
- Refer to REMOVING THE TOP LEFT COVER IN THE ENGINE COMPARTMENT and REMOVING THE TOP RIGHT COVER IN THE ENGINE COMPARTMENT .
- Refer to REMOVING UPPER CROSS CONNECTION .
- Refer to REMOVING THE REAR TOP CROSS CONNECTION .
- Refer to REMOVING THE ACOUSTIC COVER .
- Refer to REMOVING THE TENSION STRUT AT THE SHOCK TOWER ON THE LEFT AND RIGHT .
- Refer to REMOVING INTAKE SILENCER HOUSING .
- Refer to REMOVING THE LEFT UNFILTERED-AIR DUCT .
- Refer to REMOVING FAN COWL .
- Refer to REMOVING THE FRONT UNDERBODY PROTECTION .
- Refer to DRAINING THE COOLANT FOR THE LOW-TEMPERATURE COOLANT CIRCUIT .
- Refer to DRAINING THE COOLANT FROM THE HIGH-TEMPERATURE COOLING SYSTEM .
- Refer to RELEASING LEFT CHARGE AIR LINE PARTIALLY .
- Refer to REMOVING LEFT CLEAN AIR PIPE .
- Refer to REMOVING LEFT CHARGE AIR COOLER .
- Refer to REMOVING VANOS SOLENOID ACTUATOR, EXHAUST OF CYLINDER BANK 2 .
- Refer to REMOVING THE IGNITION COIL FROM CYLINDER 5 .
- Refer to REMOVING TIMING CASE COVER AT TOP LEFT .
NOTE:
RISK OF DAMAGE
Damage to timing chain or timing chain drive .
Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive .
Damage to timing chain or timing chain drive .
Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive .
- Always turn the engine with the chain tension
NOTE:
TECHNICAL INFORMATION
Conduct the following operation with the assistance of a second person.
Conduct the following operation with the assistance of a second person.
- Make sure the chain drive is simultaneously loaded on the central bolt of the engine and on the VANOS exhaust central valve .
Observe the movement of the chain tensioner piston. Perform the following steps simultaneously:
- With a second person, keep the VANOS exhaust central valve under tension clockwise.
The VANOS exhaust central valve must not be twisted.
- Turn engine counter clockwise at central bolt (1).
- Slackening the hydraulic chain tensioner of cylinder bank 2
NOTE:
RISK OF DAMAGE
Damage to timing chain or timing chain drive .
Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive .
Damage to timing chain or timing chain drive .
Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive .
- Always turn the engine with the chain tensioner or the special tool.
- Position the special tool 0 491 012 (11 4 120) (3) in the bore and fasten the chain tensioner piston.
- Make sure the chain drive is simultaneously relieved on the central bolt of the engine and on the VANOS exhaust central valve .
Perform the following steps simultaneously:
- Relieve the chain drive clockwise at the central bolt.
- Relieve the chain drive counterclockwise at the VANOS exhaust central valve.