This procedure covers the removal and replacement of the rear engine mount on a 2011-2014 Ford F-150 with the 3.5L EcoBoost V6 engine.

Warnings

Tools required

Parts

• Rear engine mount assembly × 1 — Motorcraft 9L3Z-6068-A or equivalent

Preparation

1. Park vehicle on level ground and engage parking brake
2. Allow engine to cool completely if recently operated
3. Disconnect negative battery cable
4. Raise front of vehicle and support securely on jack stands at the frame rails
5. Remove engine cover by pulling upward on cover to release retaining grommets
6. Spray all mount fasteners with penetrating oil and allow to soak for 10-15 minutes

Procedure

1. 1

   Support the engine
   Position an engine support bar across the engine bay and attach lifting chains to the engine lift points on each side of the 3.5L EcoBoost engine. Alternatively, place a floor jack with a block of wood under the oil pan to support the engine weight. Raise the support slightly to take tension off the rear mount, but do not lift the engine significantly.
2. 2

   Access the rear engine mount
   From underneath the vehicle, locate the rear engine mount assembly positioned between the engine block and the transmission crossmember. The mount is accessible from below and may require repositioning the jack for optimal access. Remove any heat shields or splash guards that obstruct access to the mount fasteners.
3. 3

   Remove the mount through bolt
   Using an 18mm socket and extension, remove the mount through bolt that passes horizontally through the center of the mount assembly. This bolt connects the engine-side bracket to the frame-side bracket through the rubber isolator. Support the bolt as it is removed to prevent it from falling.
   Torque spec

   Mount Through Bolt101 Nm (75 lb-ft)
4. 4

   Remove engine-side mounting bolts
   Locate the bolts securing the upper mount bracket to the rear of the engine block. Using a 15mm socket, remove the engine mount-to-block bolts. There are typically two or three bolts depending on the specific mount design. Support the mount assembly as the final bolt is removed.
   Torque spec

   Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
5. 5

   Remove frame-side mounting bolts
   Using an 18mm socket, remove the bolts securing the lower mount bracket to the transmission crossmember or subframe. These mount-to-frame bolts hold the lower portion of the mount assembly. The mount assembly can now be removed from the vehicle.
   Torque spec

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
6. 6

   Inspect and clean mounting surfaces
   With the mount removed, inspect the engine block and frame mounting surfaces for damage, cracks, or excessive wear. Use a wire brush to clean the mounting bolt holes and surfaces on both the engine and frame. Check that all bolt threads are clean and undamaged. Inspect the new mount for any shipping damage before installation.
7. 7

   Position new rear engine mount
   Position the new rear engine mount assembly between the engine and crossmember. Align the upper bracket with the engine block mounting holes and the lower bracket with the frame mounting holes. You may need to slightly adjust the engine height with the support jack to align all mounting points properly.
8. 8

   Install frame-side mounting bolts
   Install the mount-to-frame bolts through the lower bracket into the transmission crossmember or subframe. Start all bolts by hand to ensure proper threading. Using a torque wrench and 18mm socket, torque the mount-to-frame bolts to specification in a crisscross pattern if multiple bolts are present.
   Torque spec

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
9. 9

   Install engine-side mounting bolts
   Install the engine mount-to-block bolts through the upper bracket into the rear of the engine block. Start all bolts by hand first. Using a torque wrench and 15mm socket, torque the engine mount-to-block bolts to specification in a crisscross pattern.
   Torque spec

   Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
10. 10

    Install mount through bolt
    Insert the mount through bolt horizontally through the mount assembly, connecting the engine-side bracket to the frame-side bracket through the rubber isolator. Ensure the bolt passes completely through all components. Using a torque wrench and 18mm socket, torque the mount through bolt to specification.
    Torque spec

    Mount Through Bolt101 Nm (75 lb-ft)
11. 11

    Remove engine support and reinstall components
    Carefully remove the engine support bar or floor jack from under the engine, allowing the engine weight to settle onto the new mount. Reinstall any heat shields or splash guards that were removed for access. Reinstall the engine cover by pressing down firmly to engage the retaining grommets.

Reassembly

1. Ensure all fasteners are torqued to specification and no tools or parts are left in the engine bay
2. Lower the vehicle from jack stands
3. Reconnect the negative battery cable

Verification

• Start the engine and verify no unusual vibrations or noises are present
• With the engine running, shift through all gear positions (Park, Reverse, Neutral, Drive) and observe that engine movement is controlled and the mount is functioning properly
• Perform a test drive and verify smooth operation with no excessive vibration during acceleration or deceleration
• After test drive, re-inspect all mount fasteners from underneath the vehicle to confirm they remain tight

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