This procedure covers the removal and replacement of the front engine mount on a 2014-2018 Chevrolet Silverado 1500 with the 5.3L V8 L83 engine.

Warnings

Tools required

Parts

• Front engine mount assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level, solid ground and engage parking brake
2. Allow engine to cool completely
3. Disconnect negative battery cable
4. Raise front of vehicle and support securely on jack stands at frame rails
5. Remove engine skid plate or belly pan if equipped

Procedure

1. 1

   Position engine support
   Place a hydraulic floor jack with a wood block (minimum 2x6 inch) under the engine oil pan to support engine weight. Raise jack until it just contacts the pan with slight upward pressure, but do not lift the engine yet. Alternatively, install an engine support bar across the fender wells according to manufacturer instructions.
2. 2

   Identify front engine mount location
   Locate the front engine mount on the driver side of the engine block. The mount consists of an upper bracket bolted to the engine block and a lower bracket bolted to the frame crossmember, connected by a through-bolt and rubber isolator.
3. 3

   Remove mount through-bolt
   Using a socket and ratchet, remove the large through-bolt that passes horizontally through the engine mount assembly connecting the upper and lower brackets. This bolt may require significant force to loosen. Support the bolt as it comes free to prevent it from falling.
   Torque spec

   Through-Bolt85 Nm (63 lb-ft)
4. 4

   Raise engine slightly
   Carefully raise the engine approximately 1-2 inches using the floor jack or engine support bar. Raise only enough to unload the engine mount and create clearance. Monitor all engine components, hoses, and wiring to ensure nothing is being stretched or stressed. Stop immediately if any resistance is felt.
   ⚠Do not raise engine more than necessary. Excessive lifting can damage wiring harnesses, hoses, or other connected components.
5. 5

   Remove upper mount-to-block bolts
   Remove the bolts securing the upper engine mount bracket to the engine block. Typically there are 2-3 bolts accessible from above or below depending on exact configuration. Use an extension as needed to access bolts in tight spaces.
   Torque spec

   Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
6. 6

   Remove lower mount-to-frame bolts
   From underneath the vehicle, remove the bolts securing the lower engine mount bracket to the frame crossmember. Support the mount assembly as you remove the final bolt to prevent it from falling.
   Torque spec

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
7. 7

   Remove engine mount assembly
   With all fasteners removed, carefully maneuver the engine mount assembly out from between the engine and frame. It may be necessary to slightly adjust engine height or angle the mount to clear surrounding components. Inspect the mount for rubber deterioration, cracks, oil contamination, or separation of the isolator from metal brackets.
8. 8

   Clean mounting surfaces
   Use a wire brush to clean the mounting surfaces on both the engine block and frame crossmember. Remove any rust, debris, or old thread-locking compound from bolt holes. Inspect mounting surfaces for damage or cracks.
9. 9

   Install new engine mount assembly
   Position the new engine mount assembly between the engine block and frame crossmember. Align the mounting holes on both upper and lower brackets. It may be necessary to adjust engine height slightly using the jack to achieve proper alignment.
10. 10

    Install and torque mount-to-block bolts
    Install the upper bracket bolts securing the mount to the engine block. Thread all bolts by hand first to ensure proper alignment. Torque bolts to specification in a cross pattern if multiple bolts are used.
    Torque spec

    Engine Mount-to-Block Bolts65 Nm (48 lb-ft)
11. 11

    Install and torque mount-to-frame bolts
    Install the lower bracket bolts securing the mount to the frame crossmember. Thread all bolts by hand first, then torque to specification.
    Torque spec

    Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
12. 12

    Lower engine onto mount
    Carefully lower the engine using the floor jack or support bar until the engine weight is resting fully on the new mount. Ensure the mount through-bolt holes in the upper and lower brackets are properly aligned.
13. 13

    Install and torque through-bolt
    Install the mount through-bolt, ensuring it passes completely through both the upper and lower mount brackets and the rubber isolator. Thread the nut onto the bolt and torque to specification. This bolt should be tightened with the engine weight resting on the mount.
    Torque spec

    Through-Bolt85 Nm (63 lb-ft)
14. 14

    Remove engine support and reinstall components
    Carefully lower and remove the floor jack or engine support bar. Reinstall the engine skid plate or belly pan if equipped. Lower the vehicle from jack stands. Reconnect the negative battery cable.

Reassembly

1. Ensure all fasteners are torqued to specification before removing engine support
2. Verify no tools or parts were left in the engine compartment
3. Double-check that all displaced wiring and hoses are properly routed and secured

Verification

• Start the engine and observe the mount for proper operation with no excessive movement
• Check for unusual vibrations at idle and during acceleration in Park
• With engine running, have an assistant shift between Park, Reverse, and Drive while observing engine movement - it should be minimal and smooth
• Test drive the vehicle and verify reduced vibration compared to worn mount condition
• Re-inspect all mount bolts for tightness after test drive

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