Engine Mounts - All

Complete removal and replacement of all engine mounts (left, right, and rear) for the 2009 Aston Martin DB9 6.0L V12. Requires engine support and undercarriage access.

Warnings

Tools required

Parts

• Left engine mount assembly × 1 — Use OEM specification (Aston Martin part number)
• Right engine mount assembly × 1 — Use OEM specification (Aston Martin part number)
• Rear engine mount assembly × 1 — Use OEM specification (Aston Martin part number)

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Allow engine to cool completely (minimum 2 hours after operation).
3. Disconnect negative battery terminal and secure cable away from battery post.
4. Raise front of vehicle and support on axle stands at manufacturer-specified jacking points.
5. Remove front undertray/splash shield to access engine mounts from below.
6. Remove both front wheels for improved access to mount areas.
7. Document or photograph engine bay hose and wiring routing for reference during reassembly.

Procedure

1. 1

   Install Engine Support System
   Install engine support fixture across inner fender rails or attach overhead hoist with load leveler to engine lifting eyes. Take up slack to barely contact engine but do not lift yet. Verify support is secure and balanced front-to-rear. The V12 engine is heavy and must be evenly supported; verify engine weight against Aston Martin service documentation before selecting support equipment. Note: The V12 engine is heavy (several hundred pounds fully dressed) and must be evenly supported with equipment rated well above the engine's weight; verify the exact engine weight against Aston Martin service data before selecting support equipment. Note: The V12 engine is heavy and must be evenly supported; verify engine weight against Aston Martin service data before selecting support equipment.
2. 2

   Remove Left Engine Mount
   Working from underneath, locate the left engine mount assembly between the engine block and the chassis mounting point (verify mount location and chassis attachment terminology against Aston Martin service documentation). Remove the through-bolt securing mount to engine bracket (verify socket size against factory data). Support engine with hydraulic jack using a broad load spreader against a structurally sound point (do not jack directly on the aluminum oil pan), then lift engine approximately 15-20mm to relieve load on mount. Remove the bolts securing mount to subframe (verify exact count and size against Aston Martin service documentation). Extract mount assembly downward through chassis opening. Inspect engine bracket on block for cracks or damage. Note: Remove the through-bolt securing mount to engine bracket (verify socket size against Aston Martin service documentation). Note: Remove the through-bolt securing mount to engine bracket (verify socket size against OEM data). Support engine using the engine support fixture or a jack positioned under a structural lifting point (do not jack directly on the aluminum oil pan), then lift engine approximately 15-20mm to relieve load on mount. Note: Remove the bolts securing mount to subframe (verify exact count and size against Aston Martin service data).
   Torque spec

   Engine Mount Through-Bolt119 Nm (88 lb-ft)

   Engine Mount-to-Frame Bolts82 Nm (61 lb-ft)
3. 3

   Remove Right Engine Mount
   Locate the right engine mount assembly on passenger side between engine block and subframe. Remove the through-bolt securing mount to engine bracket. Carefully raise engine slightly on right side using jack with a broad load spreader against a structurally sound point (do not jack directly on the aluminum oil pan) to relieve mount tension (monitor for hose/harness strain). Remove the bolts securing mount to subframe (verify exact count against Aston Martin service data). Extract mount assembly downward. Check engine bracket for wear or elongated mounting holes. Note: Carefully raise engine slightly on right side using the support fixture or a jack positioned under a structural lifting point (not the aluminum oil pan) to relieve mount tension (monitor for hose/harness strain).
   Torque spec

   Engine Mount Through-Bolt119 Nm (88 lb-ft)

   Engine Mount-to-Frame Bolts82 Nm (61 lb-ft)
4. 4

   Access Rear Engine Mount
   From underneath vehicle, locate the rear transaxle mount assembly; note the DB9 uses a rear-mounted transaxle connected to the engine via a torque tube, so this mount is located at the rear transmission/crossmember area rather than at the engine bellhousing. This mount may require removal of heat shields or exhaust support brackets for clear access. Use mechanic's wire to secure any displaced exhaust components. Verify you can access both the mount-to-transmission bolts and mount-to-crossmember bolts before proceeding. Note: From underneath vehicle, locate the rear engine/torque-tube mount. Note that the DB9 uses a rear transaxle connected by a torque tube, so the 'rear mount' is not located at an engine bell housing. Verify the exact rear mount location against Aston Martin service documentation, as it may require removal of heat shields or exhaust support brackets for clear access. Note: From underneath vehicle, locate the rear powertrain mount. Note that the 2009 DB9 uses a rear-mounted transaxle layout, so confirm against Aston Martin service data whether the rear mount is at the engine, the torque tube, or the rear transaxle before proceeding.
5. 5

   Remove Rear Engine/Transmission Mount
   Support the applicable component (engine rear mount or transaxle mount) with a hydraulic jack and wood block at the manufacturer-specified support point. Remove the mounting bolts connecting the mount to its bracket (verify count and size against Aston Martin documentation). Raise the component only enough to relieve mount load. Remove the bolts securing the mount to the crossmember (verify count and size). Lower the jack slightly and extract the mount assembly. Inspect the bracket and crossmember mounting points for cracks. bracket and crossmember mounting points for cracks. Note: Support the rear transaxle with a transmission jack using a broad load spreader against the housing (avoid point-loading cast aluminum), positioned to safely bear the transaxle weight. Note: Support the rear powertrain mounting location with a hydraulic jack and appropriate padding per OEM service data. Remove the through-bolt or mounting bolts connecting the mount to its bracket (verify exact bolt count against Aston Martin service data).
   Torque spec

   Transmission Mount Bolts65 Nm (48 lb-ft)
6. 6

   Inspect Mounting Points and Brackets
   With all mounts removed, thoroughly inspect engine brackets on block for cracks, elongated holes, or corrosion. Check subframe mounting points for damage or thread wear. Inspect transmission bracket for stress cracks. Clean all mounting surfaces with wire brush, removing rust, old thread compound, or debris. Check that mounting studs or bolt holes in subframe are clean and threads are intact. Replace any damaged brackets before installing new mounts.
7. 7

   Install New Left Engine Mount
   Position new left mount assembly between engine bracket and subframe mounting point. Start the subframe mounting bolts by hand (verify exact bolt count against Aston Martin service documentation), ensuring mount is properly seated against the chassis mounting point. Do not fully tighten yet. Insert through-bolt into engine bracket and mount, threading by hand. Use jack to adjust engine height for optimal alignment. Tighten subframe bolts to Aston Martin specified torque in a cross pattern. Torque through-bolt to Aston Martin specification (do not apply any assumed torque value; confirm exact figure against factory service data before tightening).
   Torque spec

   Engine Mount-to-Frame Bolts82 Nm (61 lb-ft)

   Engine Mount Through-Bolt119 Nm (88 lb-ft)
8. 8

   Install New Right Engine Mount
   Position new right mount assembly between engine bracket and subframe. Start the subframe mounting bolts by hand (verify exact bolt count against Aston Martin service documentation), verifying proper seating. Insert through-bolt into engine bracket and mount. Adjust engine height with jack to align mount without forcing. Tighten subframe bolts to specification in a cross pattern. Torque through-bolt to specification. Verify engine sits level by checking oil dipstick orientation or valve cover alignment with chassis reference points.
   Torque spec

   Engine Mount-to-Frame Bolts82 Nm (61 lb-ft)

   Engine Mount Through-Bolt119 Nm (88 lb-ft)
9. 9

   Install New Rear Engine/Transmission Mount
   Position new rear mount assembly between transmission bracket and crossmember. Start crossmember mounting bolts by hand, ensuring proper mount orientation. Use jack to raise transmission to proper height for bracket bolt alignment. Install and start transmission bracket bolts by hand. Once all bolts are started and mount is properly seated, torque crossmember bolts first, then transmission bracket bolts to specification. Remove transmission jack.
   Torque spec

   Transmission Mount Bolts65 Nm (48 lb-ft)
10. 10

    Verify Engine Position and Remove Support
    With all mounts installed and torqued, slowly lower engine support fixture or hoist to transfer full engine weight to new mounts. Check that engine sits in proper position with no visible misalignment. Verify clearance between engine components and chassis/firewall. Gently rock engine by hand to confirm mounts are fully seated and properly supporting weight. Remove engine support fixture or disconnect hoist. Reinstall any heat shields or exhaust brackets removed during rear mount access.

Reassembly

1. Reinstall front undertray/splash shield using original Torx fasteners.
2. Reinstall both front wheels and torque lug nuts to manufacturer specification (typically 110 Nm/81 lb-ft for DB9).
3. Lower vehicle from axle stands.
4. Reconnect negative battery terminal and torque to 8 Nm (6 lb-ft).
5. Verify all tools and parts have been removed from engine bay.

Verification

• Start engine and allow to idle. Listen for abnormal vibration or knocking sounds that would indicate improper mount installation.
• With engine running, observe engine movement during throttle blip (should be minimal and return to rest position smoothly).
• Shift transmission through all gears with foot on brake and verify smooth engagement without excessive drivetrain clunk.
• Road test vehicle and verify no abnormal vibration at idle, during acceleration, or at cruising speeds.
• After 50-100 miles of driving, re-check all mount fastener torque values to ensure no loosening has occurred.
• Inspect under vehicle for any fluid leaks that may have occurred during mount replacement procedure.

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