engine

Engine Mounts - All

for 2021 Honda Civic 1.5L I4 Turbo · FWD

Difficulty

Advanced

Time

4.0 h

Tools

Steps

Complete replacement of all four engine mounts (front, rear, left side, and right side transmission mount) on the 2016-2021 Honda Civic 1.5L Turbo to eliminate vibration and restore proper engine support.

Warnings

⚠️Engine must be properly supported at all times during this procedure. Failure to secure engine can result in catastrophic damage or serious injury.

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

⚠Engine mounts are directional and position-specific. Installing incorrect mount in wrong location will cause severe vibration and potential damage.

⚠Do not loosen all mounts simultaneously. Replace one mount at a time while engine is properly supported.

ℹ️All torque specifications marked CRITICAL must be followed precisely to ensure safe engine support.

Tools required

Floor jack with minimum 2-ton capacityEssential

Jack stands rated for vehicle weightEssential

Engine support bar or engine hoistEssential

Torque wrench (10-100 Nm range)Essential

19mm socket and ratchetEssential

17mm socket and ratchetEssential

14mm socket and ratchetEssential

10mm socket and ratchetEssential

Breaker barEssential

Pry bar

Penetrating oil

Wire brush

Parts

Front engine mount assembly × 1 — Honda 50805-TBA-A02 or equivalent
Rear engine mount assembly × 1 — Honda 50810-TBA-A01 or equivalent
Left side engine mount assembly × 1 — Honda 50830-TBA-A01 or equivalent
Right side transmission mount assembly × 1 — Honda 50820-TBA-A01 or equivalent

Preparation

Park vehicle on level surface and engage parking brake
Allow engine to cool completely if recently operated
Disconnect negative battery cable and secure away from terminal
Remove engine cover by pulling upward on front edge and sliding forward to release rear clips
Raise front of vehicle and secure on jack stands at designated lift points
Remove front wheels using 19mm lug wrench
Remove plastic engine splash shield and lower covers using 10mm socket
Apply penetrating oil to all mount bolts and allow to soak for 15 minutes

Procedure

1
Install engine support system
Position engine support bar across strut towers or position engine hoist with load leveler attached to engine lift points. Use chain or strap to attach to engine lift bracket near dipstick tube. Apply just enough upward tension to take slack out of mounts without lifting engine. Verify engine is stable and support is secure before proceeding.
⚠️Engine support must remain in place throughout entire procedure. Check support stability before each mount removal.
2
Remove right side transmission mount
From underneath vehicle, locate transmission mount on right side (passenger side) of engine bay. Remove two mount-to-frame bolts using 17mm socket. Slightly raise engine using support system to relieve pressure on mount. Remove mount through-bolt using 19mm socket and breaker bar. Remove mount assembly from vehicle. Inspect mounting locations for damage or corrosion and clean with wire brush.
Torque spec
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
Mount Through Bolt84 Nm (62 lb-ft)
3
Install new right side transmission mount
Position new transmission mount into place on frame bracket. Insert and hand-tighten through-bolt but do not torque yet. Lower engine slightly using support system to align mount-to-frame holes. Install and hand-tighten mount-to-frame bolts. Adjust engine position as needed to eliminate binding. Torque mount through-bolt first, then torque mount-to-frame bolts.
Torque spec
Mount Through Bolt84 Nm (62 lb-ft)
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
4
Remove front engine mount
From top of engine bay, locate front engine mount positioned below intake manifold area. Remove engine mount-to-block bolts (typically three bolts) using 14mm socket. From underneath vehicle, remove engine mount-to-frame bolts using 17mm socket. Carefully lower mount assembly out from bottom of vehicle. Clean mounting surfaces on engine block and subframe.
Torque spec
Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
5
Install new front engine mount
Position new front mount onto subframe from underneath vehicle. Install and hand-tighten engine mount-to-frame bolts. Adjust engine height using support system to align mount-to-block holes. Install and hand-tighten engine mount-to-block bolts. Verify mount is properly seated with no gaps. Torque mount-to-frame bolts first, then torque mount-to-block bolts in star pattern.
Torque spec
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
6
Remove rear engine mount
From underneath vehicle, locate rear engine mount at back of engine block near firewall. Remove transmission mount bolts connecting mount to transmission housing using 17mm socket. Remove mount-to-frame bolts securing mount to rear crossmember using 17mm socket. Use slight upward pressure on engine with support system if needed to relieve binding. Remove mount assembly.
Torque spec
Transmission Mount Bolts65 Nm (48 lb-ft)
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
7
Install new rear engine mount
Position new rear mount onto rear crossmember. Install and hand-tighten mount-to-frame bolts. Adjust engine position to align transmission housing holes. Install and hand-tighten transmission mount bolts. Verify mount rubber is not twisted or pinched. Torque mount-to-frame bolts first, then torque transmission mount bolts.
Torque spec
Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
Transmission Mount Bolts65 Nm (48 lb-ft)
8
Remove left side engine mount
From left side of engine bay (driver side), locate side engine mount between engine block and frame rail. Remove upper mounting bolts connecting mount bracket to engine block using 14mm socket. Remove through-bolt securing mount to frame bracket using 19mm socket and breaker bar. May need to adjust engine position slightly with support system. Remove mount assembly and bracket.
Torque spec
Mounting Bolts45 Nm (33 lb-ft)
Through-Bolt85 Nm (63 lb-ft)
9
Install new left side engine mount
Position new left side mount and bracket assembly onto frame bracket. Insert and hand-tighten through-bolt. Align mount bracket with engine block mounting holes. Install and hand-tighten mounting bolts to engine block. Verify mount orientation is correct with arrow or marking pointing forward if present. Torque through-bolt first, then torque mounting bolts to engine block in sequence.
Torque spec
Through-Bolt85 Nm (63 lb-ft)
Mounting Bolts45 Nm (33 lb-ft)
10
Final torque verification and support removal
Systematically verify all mount bolts are torqued to specification using torque wrench. Check each mount visually to ensure no gaps between mount and mounting surfaces. Carefully and slowly release tension on engine support system while monitoring engine position. Once engine weight is fully on new mounts, remove engine support bar or hoist. Rock engine gently by hand to verify mounts are properly seated and secure.

Reassembly

Reinstall engine splash shield and lower covers using 10mm bolts
Reinstall front wheels and torque lug nuts to 108 Nm (80 lb-ft) in star pattern
Lower vehicle from jack stands to ground
Reinstall engine cover by aligning rear clips first, then pressing down on front edge until clips engage
Reconnect negative battery cable and tighten securely

Verification

Start engine and verify it runs smoothly without excessive vibration at idle
With parking brake engaged and foot on brake, shift through all transmission positions while monitoring for unusual vibration or movement
Rev engine to 2500-3000 RPM in park and verify no excessive engine movement or knocking sounds from mount areas
Test drive vehicle at various speeds and verify smooth operation with no vibration felt through steering wheel or chassis
After test drive, re-inspect all mount bolts for proper torque and check for any signs of loosening or movement
Visually inspect all mounts from underneath vehicle to confirm no contact with frame or other components during operation