This procedure covers the removal and replacement of motor mounts on the 2022 Rivian EDV 500 dual motor electric drivetrain, requiring powertrain support and precise reinstallation to prevent vibration and component damage.

Warnings

Tools required

Parts

• Front motor mount × 1 — Use OEM specification
• Rear motor mount × 1 — Use OEM specification
• Motor mount hardware kit × 1 — Use OEM specification
• Thread locking compound (medium strength) × 1 — Loctite 243 or equivalent

Preparation

1. Verify customer complaint and determine which motor mount requires replacement (front or rear drive unit)
2. Ensure vehicle is on level surface and engage parking brake
3. Disconnect 12V auxiliary battery negative terminal
4. Follow manufacturer high-voltage lockout procedure: access HV disconnect, remove service plug, wait minimum 5 minutes for capacitor discharge, verify zero voltage with HV meter
5. Install HV lockout tag and retain service plug on person
6. Raise vehicle on lift to comfortable working height and support with jack stands
7. Remove appropriate underbody panels and skid plates to access motor mount area
8. Document motor mount positioning with photographs for reference during reinstallation
9. Inspect coolant lines and electrical harnesses near motor mounts for damage or wear

Procedure

1. 1

   Support the motor assembly
   Position hydraulic transmission jack or powertrain support fixture under the motor assembly requiring mount replacement. Apply gentle upward pressure to slightly unload the motor mounts, but do not lift the motor. Ensure the support is stable and positioned to prevent damage to motor housing or attached components. Use wood blocks or rubberized surfaces to protect motor casing.
2. 2

   Disconnect motor cooling lines if necessary
   If cooling lines obstruct access to motor mounts, carefully disconnect coolant quick-connect fittings at the motor. Have drain pan ready to catch residual coolant (approximately 1-2 quarts may drain). Cap or plug open connections to prevent contamination. Mark connection orientation for proper reassembly.
3. 3

   Remove electrical harness brackets
   Identify and remove any electrical harness brackets or clips attached to the motor mount assembly. Carefully move wiring harnesses away from work area and secure to prevent damage. Do not place excessive tension on HV cables or sensor wiring.
4. 4

   Remove motor mount upper fasteners
   Locate and remove the upper motor mount bolts that attach the mount bracket to the vehicle chassis or subframe. These are typically M12 or M14 bolts. Support the mount assembly while removing the final fastener. Note the orientation and position of any washers, spacers, or alignment dowels.
5. 5

   Remove motor mount lower fasteners
   Remove the lower motor mount bolts that attach the mount to the motor housing. Use the hydraulic jack to carefully raise or lower the motor assembly as needed to access fasteners (maximum 10mm vertical adjustment). Keep motor alignment as close to original position as possible.
6. 6

   Extract the motor mount
   Carefully remove the motor mount assembly from between the motor and chassis. You may need to slightly adjust the hydraulic jack position to create clearance. Inspect the mounting surfaces on both the motor housing and chassis for damage, cracks, or corrosion. Clean mounting surfaces thoroughly with solvent and wire brush if necessary.
7. 7

   Compare and prepare new motor mount
   Compare the new motor mount with the removed unit to verify correct replacement part. Check that all mounting hole positions, bushing orientation, and bracket geometry match exactly. Inspect new mount for shipping damage. Apply thin coat of anti-seize compound to bolt threads (avoid contact with rubber isolators).
8. 8

   Install new motor mount
   Position the new motor mount between the motor housing and chassis mount points. Align all mounting holes carefully. If equipped with alignment dowels or pins, ensure proper engagement. Use the hydraulic jack to adjust motor position as needed for alignment, making small incremental adjustments.
9. 9

   Install and hand-tighten lower fasteners
   Install the lower motor mount bolts through the mount into the motor housing. Start all bolts by hand to ensure proper thread engagement. Apply medium-strength thread locking compound to bolt threads per manufacturer specification. Hand-tighten bolts in a cross pattern but do not torque yet.
10. 10

    Install and hand-tighten upper fasteners
    Install the upper motor mount bolts through the chassis mount points. Ensure any washers, spacers, or alignment shims are positioned correctly. Apply thread locking compound as specified. Hand-tighten all bolts but do not torque yet. Verify motor assembly alignment appears centered and level.
11. 11

    Torque motor mount fasteners
    Without torque specifications available in database, consult Rivian service manual for exact torque values (typically 60-80 ft-lbs for main mount bolts on EV applications). Torque lower mount bolts first in a cross pattern, then torque upper mount bolts in a cross pattern. Ensure motor assembly remains properly aligned during torque procedure.
12. 12

    Reconnect coolant lines and electrical brackets
    If coolant lines were disconnected, reconnect quick-connect fittings ensuring they click and lock properly. Verify proper seating by gently pulling on connections. Reinstall all electrical harness brackets and clips to motor mount assembly, ensuring wiring is routed away from moving components and heat sources.
13. 13

    Remove powertrain support and verify
    Carefully lower and remove the hydraulic transmission jack or support fixture from under the motor assembly. Allow the motor weight to fully settle onto the new mounts. Visually inspect that motor assembly sits level and at proper height compared to reference photographs. Check for any contact between motor assembly and surrounding components.
14. 14

    Reinstall underbody protection
    Reinstall all underbody panels, skid plates, and protective covers removed during preparation. Ensure all fasteners are properly torqued and clips fully engaged. Verify no tools or parts have been left in the work area.
15. 15

    Re-energize vehicle systems
    Reconnect 12V auxiliary battery negative terminal. Reinstall HV service plug following manufacturer procedure and remove lockout tag. Use Rivian diagnostic software to clear any stored fault codes related to HV disconnect. Verify all vehicle systems initialize properly and no new fault codes are present.

Reassembly

1. Ensure all motor mount fasteners are torqued to specification in the proper sequence
2. Verify motor assembly alignment is correct and matches pre-service position
3. Confirm all coolant connections are secure and properly seated
4. Check that electrical harnesses have adequate clearance and are properly secured
5. Verify all underbody panels and protective covers are reinstalled

Verification

• Perform visual inspection of motor mount installation, checking for proper alignment and clearances
• Check coolant level in EV battery/motor cooling system reservoir and top off if necessary with EV Battery/Motor Coolant to proper level
• Start vehicle and verify no warning lights or fault codes are present on instrument cluster
• Perform test drive including gentle acceleration, deceleration, and low-speed maneuvering to verify no abnormal vibration or noise from motor mount area
• Re-check all motor mount fasteners for proper torque after test drive
• Use Rivian diagnostic software to verify all drivetrain systems are operating normally and no pending codes are stored
• Perform final inspection of work area for tools and parts, and verify all access panels are secured

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