Engine Mounts - All

Complete replacement of all engine and transmission mounts on the 2005 Dodge Viper with 8.3L V10, including removal of front and rear engine mounts and transmission mount while supporting the powertrain.

Warnings

Tools required

Parts

• Left front engine mount × 1 — Use OEM specification
• Right front engine mount × 1 — Use OEM specification
• Rear engine mount × 1 — Use OEM specification
• Transmission mount × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Disconnect negative battery cable.
3. Raise front of vehicle and support securely on jack stands at manufacturer-specified lift points.
4. Remove front undertray or belly pan to access engine mounts from below.
5. Spray all mount fasteners with penetrating oil and allow to soak for 30 minutes.
6. Position hydraulic jack with rubber pad under oil pan (use wood block between jack and pan for protection).
7. Raise jack until it just contacts oil pan without lifting engine.

Procedure

1. 1

   Support powertrain from above
   Install engine support fixture across engine bay using manufacturer-specified support points, or position transmission jack under transmission pan with wood block for protection. The powertrain must be independently supported before any mount is removed. Adjust support to take slight tension but do not lift engine at this stage.
2. 2

   Remove right front engine mount
   Locate right front engine mount on passenger side of engine block. Remove the mount-to-frame fasteners (typically 2-3 bolts). Raise engine slightly using floor jack under oil pan (approximately 0.5 inch) to relieve tension on mount. Remove the engine mount-to-block fasteners. Extract mount from engine bay. Note orientation and position of mount for installation reference.
3. 3

   Remove left front engine mount
   Locate left front engine mount on driver side of engine block. Remove the mount-to-frame fasteners. Adjust floor jack to shift engine weight slightly toward passenger side to relieve tension on this mount. Remove the engine mount-to-block fasteners. Extract mount from engine bay. Inspect mount bracket on frame and engine block for damage or cracks.
4. 4

   Remove rear engine mount
   Locate rear engine mount at back of engine block near bellhousing junction. This mount may incorporate a through-bolt design. Remove any heat shields or covers blocking access. Remove the mount-to-frame or crossmember fasteners. Carefully raise engine approximately 1 inch using floor jack to create clearance. Remove the through-bolt or engine-side fasteners. Extract mount downward through chassis. Inspect crossmember and engine block mounting surfaces.
5. 5

   Remove transmission mount
   With transmission properly supported by jack or support fixture, locate transmission mount at rear of transmission case. Remove the transmission mount-to-crossmember fasteners. Raise transmission slightly using jack (approximately 0.5 inch) to relieve load. Remove the mount-to-transmission case fasteners. Extract mount and inspect transmission case mounting surface for cracks or damage.
6. 6

   Clean and inspect mounting surfaces
   Use wire brush to clean all mounting surfaces on engine block, transmission case, frame rails, and crossmembers. Remove rust, old sealant residue, and debris. Inspect all mounting points for cracks, elongated bolt holes, or structural damage. Check frame rails for rust-through or weakness. Replace any damaged hardware. Replace any damaged hardware. Do not apply anti-seize or lubricant to mount fastener threads unless specified by the factory service manual, as this alters torque-to-clamp-load values on safety-critical fasteners.
7. 7

   Install new right front engine mount
   Position new right front engine mount in location, ensuring correct orientation matches original. Start engine mount-to-block fasteners hand-tight. Lower engine using floor jack to align mount with frame bracket. Start mount-to-frame fasteners hand-tight. Torque engine mount-to-block bolts to specification. Torque mount-to-frame bolts to specification.
   Torque spec

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

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

   Install new left front engine mount
   Position new left front engine mount with correct orientation. Start engine mount-to-block fasteners hand-tight. Adjust engine position using floor jack to align mount with frame bracket. Start mount-to-frame fasteners hand-tight. Torque engine mount-to-block bolts to specification. Torque mount-to-frame bolts to specification.
   Torque spec

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

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

   Install new rear engine mount
   Position new rear engine mount in mounting location with correct orientation. If through-bolt design, insert through-bolt from appropriate side. Start mount-to-frame or crossmember fasteners hand-tight. Adjust engine height using floor jack to align all mounting points without forcing. Start all engine-side fasteners hand-tight. Torque through-bolt (if equipped) to specification. Torque mount-to-frame bolts to specification. Reinstall any heat shields or covers removed earlier.
   Torque spec

   Through-Bolt85 Nm (63 lb-ft)

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
10. 10

    Install new transmission mount
    Position new transmission mount on transmission case with correct orientation. Start transmission mount-to-case fasteners hand-tight. Lower transmission using jack to align mount with crossmember. Start mount-to-crossmember fasteners hand-tight. Torque transmission mount bolts to specification. Torque mount-to-crossmember fasteners to specification.
    Torque spec

    Transmission Mount Bolts65 Nm (48 lb-ft)
11. 11

    Remove support equipment and verify alignment
    Carefully lower floor jack from under oil pan and remove. Remove engine support fixture or transmission jack. Visually inspect all mounts to ensure they are sitting properly in their brackets without binding or misalignment. Check that powertrain has settled evenly into all mounts. Rock engine gently by hand to verify mounts are engaged and holding securely.
12. 12

    Final inspection and reassembly
    Perform final visual inspection of all mount fasteners to confirm proper torque and seating. Verify no tools or parts were left in engine bay. Reinstall front undertray or belly pan with mounting fasteners. Lower vehicle from jack stands. Reconnect negative battery cable.

Reassembly

1. All mount fasteners must be torqued in the sequence specified: block/case-side fasteners first, then frame/crossmember-side fasteners.
2. Do not fully torque any mount fasteners until all mounts are installed and hand-tightened to ensure proper alignment.
3. Ensure rubber isolators in new mounts are not twisted or pinched during installation.
4. Reinstall all heat shields and protective covers removed during disassembly.

Verification

• Start engine and allow to idle. Listen for abnormal noises or vibrations that would indicate mount misalignment or failure.
• With engine running, have assistant shift transmission through all gears (with brake applied) while you observe mounts for excessive movement or separation.
• Perform test drive and verify no excessive vibration at idle, during acceleration, or during deceleration.
• After test drive, raise vehicle and perform final visual inspection of all mounts to confirm no fasteners have loosened and no contact with surrounding components.
• Check for proper clearance between engine/transmission and frame rails, steering components, and exhaust system throughout range of motion.

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