🔧 Impala - Engine Mount Replacement

This procedure covers replacing the complete powertrain mount set: the right-side engine mount, left-side transmission mount, and lower torque mounts. A torque mount limits engine movement during acceleration. Replace only one mount at a time so the engine and transmission stay aligned.

Difficulty Level: Advanced | Estimated Time: 5-8 hours

Assumption: This procedure is for a stock U.S.-spec Impala with the 3.6L V6.

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⚠️ Safety & Precautions

• ⚠️ The engine and transmission are heavy. Never work beneath them while supported only by a jack.
• ⚠️ Support the powertrain before loosening any mount.
• ⚠️ Place a wide wood block between the jack and oil pan. Never put the jack directly against the aluminum pan.
• ⚠️ Replace one mount at a time. Removing multiple mounts can let the powertrain shift or fall.
• ⚠️ Never lift the engine by the transmission pan, exhaust system, or plastic oil-pan areas.
• ⚠️ Allow the engine and exhaust to cool completely before beginning.
• ⚠️ Disconnect the negative battery cable before removing the battery tray or transmission mount.
• ⚠️ If the subframe must be loosened to access a lower mount, professional support and alignment equipment are recommended.

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🔧 Required Tools

You'll need the following tools for this repair:

• 1/2-inch drive metric socket set, 13-21mm
• 3/8-inch drive metric socket set, 7-15mm
• 15mm deep socket
• 18mm deep socket
• 21mm deep socket
• 1/2-inch drive breaker bar, 24-inch
• 1/2-inch drive torque wrench, 30-200 Nm
• 3/8-inch drive torque wrench, 5-80 Nm
• 1/2-inch drive extension set, 75-250mm
• 3/8-inch drive extension set, 75-250mm
• Metric combination wrench set, 10-21mm
• Flat-blade screwdriver, 6mm
• Trim-clip removal tool, 8mm fork
• Needle-nose pliers, 8-inch
• Floor jack, rated 2-ton minimum
• Jack stands, rated 2-ton minimum
• Rubber wheel chocks, 2-piece
• Hardwood support block, approximately 300 × 150 × 25mm
• Engine support fixture, 500kg minimum capacity (specialty)
• Paint marker, white
• Work light, LED
• Mechanic gloves, impact-resistant
• Safety glasses, ANSI Z87.1

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Right-side engine mount - Qty: 1
• Left-side transmission mount - Qty: 1
• Front lower torque mount - Qty: 1
• Rear lower torque mount - Qty: 1
• Mount fastener set - Qty: 1
• Battery-terminal protectant - Qty: 1

Replace mounts showing torn rubber, separation, leaking hydraulic fluid, or metal-to-metal contact. Use mount-specific fasteners supplied for your Impala; GM identifies certain mount bolts as single-use.

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📋 Before You Begin

• 📋 Park your Impala on level pavement. Shift into Park, apply the parking brake, and switch off the ignition.
• 📋 Open the hood and let the powertrain cool completely.
• 📋 Record radio presets if desired. No battery registration or programming is required after reconnection.
• 📋 Chock both rear wheels before raising the front.
• 📋 Arrange replacement mounts beside their matching locations. Do not assume the mount fasteners share one torque specification.
• 📋 An engine support fixture spans the strut towers and holds the engine from above. Use it whenever a jack would obstruct lower-mount access.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm socket to loosen the negative battery-terminal nut.
• Lift the negative cable from the terminal and position it where it cannot spring back.
• Wait at least two minutes before working near the starter or powertrain wiring.

Step 2: Raise and support the vehicle

• Use the floor jack at the reinforced front-center lifting point.
• Place the two jack stands beneath the reinforced left and right body support points.
• Lower the vehicle onto the stands, then gently shake it to confirm stability.
• Use the 7mm, 10mm, or 13mm socket and trim-clip removal tool, as equipped, to remove the lower splash shield.
• Photograph shields and clips before removal.

Step 3: Support the powertrain

• Install the 500kg engine support fixture across the approved upper-body support areas. Attach its chains to the factory engine lifting eyes and remove only the slack.
• If using the floor jack instead, center the hardwood block beneath a strong, flat section of the aluminum oil pan. Raise only until the block touches the pan.
• Do not raise the body or deform the oil pan. The support should carry only enough weight to unload the mount.

Step 4: Remove the right-side engine mount

• Use a 10mm socket and trim-clip removal tool to remove the intake duct and any upper covers blocking the passenger-side mount.
• Use a paint marker to trace the mount position against its body bracket.
• Use a 15mm or 18mm socket, according to the fitted fastener, to loosen the mount-to-engine bracket fasteners.
• Use a 15mm or 18mm deep socket to remove the mount-to-body fasteners.
• Adjust the engine support fixture or floor jack only a few millimetres until the mount slides out without prying.
• Inspect the bracket for cracks, elongated holes, or contact marks.

Step 5: Install the right-side engine mount

• Set the new mount against the paint marks. Start every fastener by hand for at least four turns.
• Use the engine support fixture to align the holes. Do not pull the mount into alignment with the bolts.
• Use a torque wrench with the matching socket to tighten new fasteners to the specification supplied with the mount or verified GM service specification for that exact fastener position.
• Typical fastener groups differ by diameter and location; do not apply one torque value to every mount bolt.
• Remove the support load gradually and verify the mount is seated without twisting.

Step 6: Expose the left-side transmission mount

• Use a 10mm socket to disconnect the positive battery cable only after the negative cable is isolated.
• Use a 13mm socket to remove the battery hold-down, then lift out the battery with both hands.
• Use a 10mm and 13mm socket to remove the battery tray and attached wiring retainers.
• Use the engine support fixture to support the transmission side before loosening its mount.

Step 7: Replace the left-side transmission mount

• Use a paint marker to trace the original mount position.
• Use a 15mm or 18mm socket and breaker bar to loosen the transmission-side and body-side fasteners.
• Adjust the support fixture slightly until the bolts turn freely, then remove the mount.
• Position the replacement mount and start all fasteners by hand.
• Use the torque wrench and matching socket to tighten each fastener to its position-specific GM specification or the verified instructions supplied with the replacement fastener set.
• Reinstall the battery tray with the 10mm and 13mm sockets. Secure the battery with the 13mm socket.

Step 8: Replace the front lower torque mount

• Use the work light to identify the forward lower mount between the powertrain and front cradle.
• Keep the powertrain supported from above.
• Use a paint marker to mark the mount orientation.
• Use an 18mm or 21mm socket, extension, and breaker bar to remove the mount bolts.
• Move the powertrain only enough to remove the mount. Never place fingers between the mount and bracket.
• Install the new mount in the same orientation and start both bolts by hand.
• With the vehicle supported at normal body height and the powertrain relaxed, use the torque wrench to tighten the bolts to their verified GM position-specific specifications.

Step 9: Evaluate the rear lower torque mount

• Use the work light to inspect the rear mount above the rear portion of the front cradle.
• Use an 18mm or 21mm socket and extension only if both bolts are fully accessible without moving the steering gear, exhaust, or cradle.
• If cradle movement is required, stop the DIY procedure. Cradle removal requires powertrain support, steering alignment control, single-use fasteners, and a wheel alignment afterward.
• If fully accessible, mark its orientation, remove one bolt at a time, and install the replacement mount.
• Use the torque wrench to tighten its bolts to the verified GM specifications for the exact rear-mount fastener positions.

Step 10: Reassemble the vehicle

• Use the 7mm, 10mm, or 13mm socket and trim-clip removal tool to reinstall the lower splash shield.
• Use the 10mm socket and screwdriver to reinstall the intake duct and upper covers.
• Remove the engine support fixture only after confirming every mount fastener is installed and tightened.
• Use the floor jack to raise your Impala, remove the jack stands, and lower it carefully.

Step 11: Reconnect the battery

• Connect the positive battery cable first and tighten it with the 10mm socket.
• Connect the negative battery cable last and tighten it with the 10mm socket.
• Tighten battery-terminal fasteners only until secure; do not crush or distort the terminals.
• Apply a light coating of battery-terminal protectant.

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✅ After Repair

• ✅ Check the engine bay for tools, loose wiring, and disconnected intake hoses.
• ✅ Start the engine with the transmission in Park. Watch the mounts while a helper starts and stops the engine.
• ✅ Hold the brake firmly and shift slowly through Reverse, Neutral, and Drive. Excessive clunks or movement indicate misalignment or another damaged mount.
• ✅ Do not stand in front of or behind the vehicle during the loaded-mount test.
• ✅ Take a short, low-speed test drive. Listen for clunks during acceleration, braking, and turns.
• ✅ Recheck for loose shields, oil-pan damage, and mount-to-bracket contact.
• ✅ The clock and automatic window express functions may need resetting after battery disconnection.
• ✅ Obtain a four-wheel alignment if any cradle bolts were loosened.

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💰 DIY vs Shop Cost

Shop Cost: ₹55,000-₹1,15,000 equivalent, depending on parts availability and the number of mounts replaced

DIY Cost: ₹24,000-₹60,000 for parts only

You Save: ₹25,000-₹55,000 by doing it yourself!

Local labor and imported-parts pricing vary. This repair takes a shop approximately 5-8 hours when replacing the complete mount set.

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🎯 Ready to get started?

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