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Home >> BMW >> 2021 >> X3 xDrive30e >> Repair and Diagnosis >> Engine Mechanical >> Exhaust >> Exhaust System -- Repair (G01) >> 18 00 Exhaust System >> 18 00 018 Remove & install complete exhaust system (X3 M40i, 2018-2022) >> Install exhaust system

Install exhaust system

CAUTION: Component with heavy weight. 
Injury hazard! 
  • Note component's center of gravity.
  • Support component using a jack.
  • Secure component against falling off the jack.
CAUTION: Heavy component. 
Heavy components can lead to injury or damage. 
  • Remove and install heavy components with the aid of another person/other persons.
CAUTION: Grinding dust from grinding of components. 
Hazardous to health! 
  • Directly draw off the grinding dust.
  • Ensure adequate ventilation.
  • Conduct all work in appropriate personal protective equipment only.
NOTE: TECHNICAL INFORMATION 
Check the exhaust system for tightness after installation.
NOTE: TECHNICAL INFORMATION 
Mount the exhaust system in a de-energized state, following the tightening sequence from the rear silencer towards the exhaust manifold.
CAUTION: Shavings resulting from sawing or grinding components. 
Injury hazard! 
  • Conduct all work in appropriate personal protective equipment only.
  • Wear safety goggles and hand protection.
G12702430Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
G14183324Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: TECHNICAL INFORMATION 
Conduct the following operation with the assistance of a second person.
G14298863Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUES SPECIFICATION

Rear silencer to body/bumper support
M8
Replace nuts.
Tightening torque  19 Nm
TIGHTENING TORQUES SPECIFICATION

Rear silencer to body/bumper support
M8
Replace nuts.
Tightening torque  19 Nm
G14298864Courtesy of BMW OF NORTH AMERICA, INC.
G14298860Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUES SPECIFICATION

Exhaust system to rear axle carrier
M8 Nut
Replace nuts.
Tightening torque  19 Nm
TIGHTENING TORQUES SPECIFICATION

Exhaust system to rear axle carrier
M8 Nut
Replace nuts.
Tightening torque  19 Nm
G14298861Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUES SPECIFICATION

Front pipe/front silencer/gasoline particulate filter to the transmission holder
M8
Replace nut.
Tightening torque  19 Nm
G14228344Courtesy of BMW OF NORTH AMERICA, INC.
G14228342Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUES SPECIFICATION

Exhaust system to catalytic converter
Ribbon clamp nut
M8
Replace the ribbon clamp.
Tightening torque  26 Nm
Ribbon clamp nut
M10
Replace the ribbon clamp.
Tightening torque  55 Nm
TIGHTENING TORQUES SPECIFICATION

V-ribbon clip to catalytic converter
V-ribbon clip
Replace V-ribbon clip.
Tightening torque  25 Nm
G12887738Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUES SPECIFICATION

Undershield
Screw Tightening torque  2.6 Nm
Plastic nut Tightening torque  2.6 Nm
G14298856Courtesy of BMW OF NORTH AMERICA, INC.

If installed: Install the right and left torsion struts 

G14296754Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUES SPECIFICATION

Torsion strut to mounting
M12
Replace screws.
Tightening torque  100 Nm
Angle of rotation  90°
TIGHTENING TORQUES SPECIFICATION

Torsion strut to compression strut
M8 Tightening torque  28 Nm
G14296753Courtesy of BMW OF NORTH AMERICA, INC.
TIGHTENING TORQUES SPECIFICATION

Torsion strut to mounting
M12
Replace screws.
Tightening torque  100 Nm
Angle of rotation  90°
TIGHTENING TORQUES SPECIFICATION

Torsion strut to compression strut
M8 Tightening torque  28 Nm

Follow-up work