🔧 Engine Mounts - Replacement

Replacing the engine mounts will reduce vibration and prevent the engine from shifting under load. On your Sierra, the engine must be safely supported before any mount bolts are removed, because the mounts hold the engine in place and one side is often under tension.

Difficulty Level: Intermediate | Estimated Time: 3-5 hours

---

⚠️ Safety & Precautions

• Support the engine from above or below before removing either mount.
• Do not work under a vehicle supported only by a jack.
• Use jack stands on solid ground and keep the transmission in Park.
• Keep hands clear while raising or lowering the engine slightly.
• Disconnect the negative battery cable before starting.
• Replace both mounts together so the engine sits evenly.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated for vehicle weight)
• Wood block
• Engine support bar (specialty)
• Metric socket set
• 15mm socket
• 18mm socket
• Ratchet
• Breaker bar
• Torque wrench
• Extensions
• Combination wrench set
• Flat screwdriver
• Safety glasses
• Mechanic gloves

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Left engine mount - Qty: 1
• Right engine mount - Qty: 1
• Mount-to-frame bolts - Qty: 2
• Mount-to-engine bolts - Qty: 2

---

📋 Before You Begin

• Park on level ground and set the parking brake.
• Shift to Park.
• Disconnect the negative battery cable.
• Raise the front of the truck and support it securely on jack stands.
• Support the engine with a floor jack and a wood block under the oil pan, or use an engine support bar.
• Lift only enough to unload the mounts.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect power and raise the vehicle

• Use a wrench to disconnect the negative battery cable.
• Use a floor jack to lift the front of the truck.
• Place jack stands under the frame and lower the truck onto them.

Step 2: Support the engine

• Place a floor jack with a wood block under the oil pan, or install an engine support bar across the fenders.
• Raise the engine slightly until the weight comes off the mounts.
• Do not crush the oil pan.

Step 3: Remove the mount-to-frame fasteners

• Use an 18mm socket and ratchet to remove the lower mount bolts on both sides.
• If a bolt is tight, use a breaker bar for extra leverage.

Step 4: Remove the mount-to-engine fasteners

• Use a 15mm socket and extensions to remove the upper mount bolts.
• Move wiring or hoses only as needed for access.

Step 5: Remove the old engine mounts

• Lower or raise the engine slightly with the floor jack to create clearance.
• Lift each mount out of the bracket area by hand.
• Inspect the frame brackets for cracks, rust, or torn insulators.

Step 6: Install the new engine mounts

• Position the new mounts in the same orientation as the originals.
• Install the upper bolts first by hand using a 15mm socket.
• Start the lower bolts by hand with an 18mm socket.
• Tighten both sides evenly so the engine sits centered.

Step 7: Torque the fasteners

• Use a torque wrench to tighten the mount fasteners.
• Torque to factory specification for your Sierra’s engine mount fasteners.
• Torque both sides evenly.

Step 8: Reassemble and lower the truck

• Remove the floor jack or engine support bar.
• Raise the truck slightly, remove the jack stands, and lower it to the ground.
• Reconnect the negative battery cable.

---

✅ After Repair

• Start the engine and let it idle in Park.
• Check for excessive vibration, clunks, or engine movement.
• Put the truck in Reverse and Drive with the brake held to confirm the engine stays stable.
• Inspect the mounts again after a short test drive.

---

💰 DIY vs Shop Cost

Shop Cost: $450-$900 (parts + labor)

DIY Cost: $120-$300 (parts only)

You Save: $330-$600 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.

---

🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.