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Home >> VinFast >> 2023 >> VF9 Plus >> Repair and Diagnosis >> Suspension >> Front Suspension >> Front Suspension System And Wheel Hubs >> Repair Procedures >> Front Sub Frame/Engine Cradle Removal And Installation/Replacement

Front Sub Frame/Engine Cradle Removal And Installation/Replacement

Mobile Repair Possible:  No

Overview: 

Fig 1: Front Sub Frame/Engine Cradle Components Location
G16030961Courtesy of VINFAST, LLC
WARNING: Overhead Suspended Load and Falling Parts 
Failure to follow specified procedures may result in death or serious injury when elevated load or components are incorrectly secured/supported.
  • All lifting equipment weight rating must meet or exceed the weight of the vehicle and any contents
  • The lifting equipment must be in good condition and approved for use
  • Only lift the vehicle from the identified lift points
  • Ensure vehicle is stable before performing any work underneath
  • Ensure there are no loose components which may fall
  • Always use personal protective equipment (PPE)
  • Seek assistance when handling larger components
WARNING: Crushing by moving parts 
Failure to follow specified procedures may result in death or serious injury due to front sub frame engine cradle.
  • Secure the component against uncontrolled movement.
  • Always use personal protective equipment (PPE)
  • Ensure vehicle is correctly disabled/powered down to prevent unexpected motion or activation of components.

Removal Procedure: 

  1. Remove high voltage battery. Refer to HIGH VOLTAGE BATTERY REMOVAL AND INSTALLATION/REPLACEMENT
  2. Remove front wheels. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION
  3. Remove both front tire air deflector Refer to FRONT TIRE AIR DEFLECTOR REMOVAL AND INSTALLATION/REPLACEMENT
  4. Remove front bumper fascia. Refer to FRONT BUMPER FASCIA REMOVAL AND INSTALLATION/REPLACEMENT
  5. Remove front bumper fascia skid plate. Refer to FRONT BUMPER FASCIA SKID PLATE REMOVAL AND INSTALLATION/REPLACEMENT
    G16030962Courtesy of VINFAST, LLC
  6. Remove 4 bolts (1) on both sides of the crash support brackets.

    Torque: 28 Nm 

    G16030963Courtesy of VINFAST, LLC
  7. Remove 2 bolts (1).

    Torque: 5 Nm 

    G16030964Courtesy of VINFAST, LLC
  8. Remove 2 bolts (1).

    Torque: 8 Nm 

  9. Tie up the eMotor 3-way valve (2).
    G16030965Courtesy of VINFAST, LLC
  10. Remove 2 bolts (1).

    Torque: 8 Nm. 

  11. Tie up the eMotor water pump (2).
    G16030966Courtesy of VINFAST, LLC
  12. Remove 2 bolts (1).

    Torque: 8 Nm 

  13. Tie up the low pressure chiller (2).
    G16030967Courtesy of VINFAST, LLC
  14. Remove 2 screws (1) on both sides of the front wheelhouse liner.

    Torque: 2.6 Nm 

    G16030968Courtesy of VINFAST, LLC
  15. Support the front strut yoke (1) with a gear jack.

    Removal Note: Lift the front strut yoke (1)  with the gear jack slightly to loosen the screw connection more easily. 

  16. Loosen the 2 nuts (2) and remove the bolts (3) on both sides.

    Replace with new only. 

    Tightening torque - First Pass: 140 Nm 

    Tightening torque - Final pass: 90° Rotation Angle 

  17. Remove the front strut yokes (1) from the front lower control arms (4).
  18. Loosen the nuts (1) on both sides.

    Replace with new only. 

    Tightening torque - First Pass: 120 Nm 

    Tightening torque - Second Pass: loosen nut one turn 

    Tightening torque - Final pass: 80 Nm 

  19. Remove the lower wishbones (2) from the steering knuckles (3). If necessary, press out with a press-out tool.
  20. Loosen 2 nuts (1) on both sides.

    Replace with new only. 

    Torque: 100 Nm 

  21. Remove tie bars (2) from steering knuckles (3). If necessary, press out with a press-out tool.
    G16030969Courtesy of VINFAST, LLC
  22. Disconnect the intermediate steering shaft (1) from the steering gear. Refer to INTERMEDIATE STEERING SHAFT REMOVAL AND INSTALLATION/REPLACEMENT
    G16030970Courtesy of VINFAST, LLC
  23. Remove 2 nuts (1) on both sides and separate coupling rods from the front struts. Replace with new only. 

    Torque: 72 Nm 

    G16030971Courtesy of VINFAST, LLC
  24. Hold the electric motor from above with a suitable motor holder.
  25. Remove the bolt (1) and separate motor holder (2) from unit support (3).

    Replace with new only. 

    Torque: 88 Nm 

    G16030972Courtesy of VINFAST, LLC
  26. Unlock and disconnect 2 electrical connectors (1) of the steering gear.
    G16030973Courtesy of VINFAST, LLC

    Remove note: Using a suitable lifting/supporting device for the front cradle, support the cradle before removing the securing bolts to the body. 

  27. Remove 6 bolts (1).

    Replace with new only. 

    Torque: 165 Nm 

    G16030974Courtesy of VINFAST, LLC
  28. Gently lower the front sub frame engine cradle (1) downwards using the lifting/supporting jack.

Replacement Procedure: 

  1. Rebuild steering gear. Refer to STEERING GEAR REMOVAL AND INSTALLATION/REPLACEMENT
  2. Rebuild front anti roll bar. Refer to FRONT ANTI ROLL BAR REMOVAL AND INSTALLATION/REPLACEMENT 
  3. Rebuild front lower control arm. Refer to FRONT LOWER CONTROL ARM REMOVAL AND INSTALLATION/REPLACEMENT 
  4. Rebuild front lower tension strut. Refer to FRONT LOWER TENSION STRUT REMOVAL AND INSTALLATION/REPLACEMENT 

Installation Procedure: 

NOTE: Safety-relevant procedure step 
Failure to discard the specified component(s) may cause damage to the vehicle or vehicle components.
  • Fasteners highlighted as torque prevailing must be discarded and not re-used
  • Replace with new nuts and bolts only.
  1. Installation is the reverse of removal procedure, noting the following.

    All fasteners must be tightened to torque specification! 

  2. Install front bumper fascia skid plate. Refer to FRONT BUMPER FASCIA SKID PLATE REMOVAL AND INSTALLATION/REPLACEMENT
  3. Install front bumper fascia. Refer to FRONT BUMPER FASCIA REMOVAL AND INSTALLATION/REPLACEMENT
  4. Install front tire. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION
  5. Install front tire air deflector Refer to FRONT TIRE AIR DEFLECTOR REMOVAL AND INSTALLATION/REPLACEMENT
  6. Install high voltage battery. Refer to HIGH VOLTAGE BATTERY REMOVAL AND INSTALLATION/REPLACEMENT
  7. Carry out wheel alignment. Refer to WHEEL ALIGNMENT MEASUREMENT AND SPECIFICATIONS
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