Engine Mount - Rear

This procedure covers removal and replacement of the rear engine mount on the 2016-2021 Honda Civic 1.5L Turbo engine, including proper support of the engine and torque specifications.

Warnings

Tools required

Parts

• Rear engine mount assembly × 1 — Honda OEM 50850-TBA-A01 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 terminal to prevent accidental electrical shorts
4. Raise front of vehicle and support securely on jack stands
5. Remove engine under cover if equipped (plastic shield below engine)

Procedure

1. 1

   Locate rear engine mount
   From underneath the vehicle, locate the rear engine mount positioned at the rear of the engine block near the firewall. The mount connects the engine block to the subframe with a large through-bolt and separate mounting bolts. Identify all fasteners before beginning disassembly.
2. 2

   Support engine from below
   Position a floor jack with a block of wood (minimum 6 inches square) under the engine oil pan. Raise the jack until it just contacts the wood block against the oil pan with light pressure. Do not lift the engine yet, just make contact to support weight. The wood distributes load and prevents damage to the oil pan.
3. 3

   Remove mount through bolt
   Using a 17mm socket, remove the large through-bolt that passes horizontally through the center of the rear mount assembly. This bolt connects the engine-side bracket to the frame-side bracket. You may need to slightly raise or lower the engine with the floor jack to relieve tension and allow bolt removal. Support the bolt as you remove the nut to prevent it from falling.
   Torque spec

   Mount Through Bolt84 Nm (62 lb-ft)
4. 4

   Remove engine-side mount bolts
   Using a 14mm socket, remove the bolts securing the upper portion of the mount to the engine block. There are typically three bolts arranged in a triangular pattern. Access may be tight; use extensions and wobble sockets as needed. Slightly raising the engine 5-10mm with the floor jack may improve access.
   Torque spec

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

   Remove frame-side mount bolts
   Using a 14mm or 17mm socket (depending on specific mount design), remove the bolts securing the lower portion of the mount to the subframe. There are typically two to four bolts. Support the mount assembly as you remove the final bolt to prevent it from falling.
   Torque spec

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

   Remove old mount assembly
   Carefully lower and remove the rear mount assembly from the vehicle. You may need to manipulate the engine height slightly with the floor jack to create clearance. Inspect the mount for damage such as torn rubber, separated bonding, or fluid leakage. Compare old mount to new mount to verify correct replacement part.
7. 7

   Install new mount to frame
   Position the new rear mount assembly with the frame-side bracket aligned to the subframe mounting points. Thread the frame mounting bolts by hand first to ensure proper alignment. Do not fully tighten yet. Adjust engine height with floor jack if needed to align all bolt holes.
   Torque spec

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
8. 8

   Install new mount to engine block
   Align the engine-side bracket of the new mount to the engine block mounting surface. Thread all engine-to-block bolts by hand first to prevent cross-threading. Verify proper alignment before tightening. The mount must sit flush against the engine block mounting surface.
   Torque spec

   Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
9. 9

   Install mount through bolt
   Insert the large through-bolt through the center of the mount assembly, connecting the engine bracket to the frame bracket. You may need to adjust engine height with the floor jack to align the holes. Thread the nut by hand first. Do not torque any fasteners yet.
   Torque spec

   Mount Through Bolt84 Nm (62 lb-ft)
10. 10

    Torque all mount fasteners in sequence
    With all fasteners hand-tight and mount properly positioned, torque in this sequence: First, torque the engine-to-block bolts to 65 Nm (48 lb-ft). Second, torque the frame-side bolts to 75 Nm (55 lb-ft) or 58 Nm (43 lb-ft) depending on which mounting points are used. Finally, torque the through-bolt to 84 Nm (62 lb-ft). This sequence ensures proper load distribution.
    Torque spec

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

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

    Mount Through Bolt84 Nm (62 lb-ft)
11. 11

    Remove engine support and lower vehicle
    Carefully lower the floor jack to remove support from the engine oil pan. Verify the engine settles properly onto the new mount without unusual movement. Reinstall the engine under cover if equipped. Lower the vehicle from jack stands and remove stands from under vehicle.

Reassembly

1. Reconnect negative battery terminal
2. Verify all tools and parts have been removed from engine compartment
3. Double-check that all mount bolts are properly torqued and no fasteners were missed

Verification

• Start the engine and verify no unusual vibration or engine movement
• With engine running, shift through all transmission gears (brake applied) and verify mount is holding engine securely without excessive movement
• Perform a brief test drive and listen for any clunking or unusual noises during acceleration and deceleration
• Visually inspect mount installation from underneath vehicle after test drive to verify all bolts remain tight and mount is seated properly

Related trouble codes on this vehicle

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