🔧 Engine Mounts - Replacement

Your Sierra uses left and right engine mounts to hold the engine in place and control vibration. When mounts wear out, you can get clunks, shaking, or the engine shifting under throttle. This job requires safely supporting the engine while each mount is removed and replaced.

Difficulty Level: Advanced | Estimated Time: 4-6 hours

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⚠️ Safety & Precautions

• Support the engine before removing either mount. Do not let the engine hang by the remaining side.
• Use a hydraulic jack with a wood block under the oil pan only as a support point, not for lifting the vehicle.
• Keep hands clear while raising or lowering the engine.
• Disconnect the negative battery cable if you will be working near the starter cable or wiring at the mount area.
• Use jack stands on level ground. Never rely on a jack alone.
• Do one side at a time so the engine stays aligned.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated for full vehicle weight)
• Wood block
• Metric socket set 13mm-21mm
• Metric wrench set 13mm-21mm
• Breaker bar
• Torque wrench
• Extensions and swivel socket
• Trim clip tool
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Left engine mount - Qty: 1
• Right engine mount - Qty: 1
• Engine mount nuts and bolts - Qty: 1 set

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Put the transmission in Park.
• Open the hood and remove any engine covers if equipped.
• Disconnect the negative battery cable if needed for access near wiring.
• Raise the front of the truck and support it securely on jack stands if you need underbody access.
• Work one mount at a time.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Support the engine

• Use a floor jack with a wood block under the oil pan to take the engine weight.
• Raise the jack just enough to hold the engine. Do not lift the truck.
• Small moves are safer.

Step 2: Gain access to the mount

• Use the metric socket set and trim clip tool to remove any splash shields or lower covers blocking the mount area.
• If a side is tight, use the jack to slightly raise or lower the engine until the mount bolts line up better.

Step 3: Remove the old mount

• Use the metric socket set and metric wrench set to remove the mount-to-frame and mount-to-bracket fasteners.
• Remove the old engine mount from the vehicle.
• If the bolts are tight, use the breaker bar carefully.

Step 4: Install the new mount

• Position the new engine mount in the same orientation as the old one.
• Start all fasteners by hand before tightening.
• Use the floor jack to move the engine slightly until the holes line up without force.
• Torque mount fasteners to factory specification for your Sierra.
• Never pull bolts into place.

Step 5: Repeat on the other side

• Move to the other engine mount and repeat the same removal and installation steps.
• Keep the engine supported the entire time.

Step 6: Reassemble and lower

• Reinstall any covers or splash shields using the metric socket set and trim clip tool.
• Slowly lower the floor jack and confirm the engine sits evenly on both mounts.
• Torque any reinstalled brackets or shields to factory specification.

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✅ After Repair

• Start the engine and watch for excess movement.
• Shift from Park to Reverse and Drive with the brake held. Listen for clunks.
• Check that nothing is rubbing the exhaust, fan, or brackets.
• Take a short test drive and recheck the mounts and nearby fasteners.

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💰 DIY vs Shop Cost

Shop Cost: $700-$1,400 (parts + labor)

DIY Cost: $140-$350 (parts only)

You Save: $560-$1,050 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 4-6 hours.

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🎯 Ready to get started?

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