engine

Engine Mount - Rear

for 2018 Ford F-150 3.5L V6 EcoBoost · RWD

Difficulty

Moderate

Time

1.8 h

Tools

Steps

This procedure covers the removal and replacement of the rear engine mount on a 2015-2020 Ford F-150 with the 3.5L EcoBoost V6 engine.

Warnings

⚠️Never work under a vehicle supported only by a jack. Always use jack stands rated for the vehicle weight.

⚠️Engine must be properly supported before removing mount bolts to prevent engine from dropping and causing injury or damage.

⚠Allow engine to cool completely before beginning work to avoid burns from hot components.

⚠Rear engine mount is located near the transmission and exhaust components. Be aware of sharp edges and hot surfaces.

Tools required

Floor jackEssential

Jack standsEssential

Engine support bar or transmission jackEssential

Torque wrench (10-120 Nm range)Essential

Socket set (metric)Essential

Ratchet with extensionsEssential

Pry bar

Wood block for transmission protectionEssential

Penetrating oil

Parts

Rear engine mount assembly × 1 — Use OEM Ford specification for 3.5L EcoBoost

Preparation

Park vehicle on level ground and engage parking brake
Allow engine and exhaust system to cool completely
Disconnect negative battery cable
Raise vehicle and secure on jack stands at manufacturer-specified lift points
Remove plastic belly pan or skid plate if equipped to access rear engine mount area

Procedure

1
Locate and inspect rear engine mount
The rear engine mount is located at the rear of the engine block near the transmission bell housing. From underneath the vehicle, identify the mount assembly which connects the engine to the crossmember. Inspect the area for any obstructions and determine the best access route.
2
Support the engine and transmission
Position an engine support bar across the engine compartment above the engine, or position a transmission jack under the transmission pan with a wood block to distribute load. Raise the support slightly to take tension off the rear mount, but do not lift the engine excessively. The engine should be just barely supported with no weight on the mount.
3
Remove mount through bolt
Locate the large through bolt that passes horizontally through the center of the rear mount assembly. Remove the nut from the through bolt using a socket and ratchet. The bolt may be tight, so ensure you have proper leverage. Tap the bolt out using a brass drift or punch if necessary. Keep the bolt and hardware for comparison with the new mount.
Torque spec
Mount Through Bolt101 Nm (75 lb-ft)
4
Remove mount-to-frame bolts
Locate the bolts securing the lower portion of the mount bracket to the frame crossmember. There are typically 2-3 bolts depending on the specific mount design. Remove these bolts using a socket and extension. Apply penetrating oil if bolts are corroded. Support the mount with one hand as you remove the final bolt.
Torque spec
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
5
Remove engine mount-to-block bolts
Remove the bolts that secure the upper mount bracket to the engine block. These bolts are accessed from underneath and may require a long extension and swivel socket. There are typically 2-4 bolts. Once removed, the mount assembly can be separated from the engine and lowered away from the vehicle.
Torque spec
Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
6
Remove and inspect old mount
Carefully lower the old mount assembly from the vehicle. Inspect the mount for signs of failure such as torn rubber, oil contamination, separated rubber from metal plates, or collapsed mounting bushings. Compare the old mount to the new replacement to ensure correct application and bracket orientation.
7
Install new mount to engine block
Position the new rear mount assembly to the engine block, aligning the bolt holes. Thread in the engine mount-to-block bolts by hand first to ensure proper alignment. Once all bolts are started, tighten them to specification in a crisscross pattern using a torque wrench.
Torque spec
Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
8
Secure mount to frame crossmember
Align the lower bracket of the mount assembly with the frame crossmember bolt holes. You may need to raise or lower the engine support slightly to achieve proper alignment. Install the mount-to-frame bolts by hand, then torque to specification.
Torque spec
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
9
Install mount through bolt
Insert the through bolt through the center of the mount assembly, ensuring it passes through all mounting bushings and brackets correctly. Install the washer and nut on the end of the through bolt. Torque the through bolt nut to specification. This bolt is critical for proper mount function.
Torque spec
Mount Through Bolt101 Nm (75 lb-ft)
10
Remove engine support and verify alignment
Carefully lower and remove the engine support bar or transmission jack, allowing the engine weight to settle onto the new mount. Check that the engine sits level and that there is no binding or misalignment. Gently rock the engine by hand to ensure the mount is properly seated and functioning.

Reassembly

Reinstall plastic belly pan or skid plate using original fasteners
Lower vehicle from jack stands
Reconnect negative battery cable
Verify all tools and parts have been removed from engine compartment

Verification

Start the engine and verify there are no unusual vibrations or noises from the mount area
With engine running, shift transmission through all gears (with brake applied) and observe mount for excessive movement or abnormal engine deflection
Perform a brief test drive and confirm smooth operation without excessive engine movement during acceleration and deceleration
Inspect mount area for any signs of contact or interference with surrounding components
Re-check all mount bolt torque after initial test drive if desired for critical applications