Engine Mount - Torque Axis

Replace the torque axis engine mount (upper dogbone mount) that controls engine torque rotation on the 5.9L Cummins diesel engine.

Warnings

Tools required

Parts

• Torque axis engine mount assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Chock rear wheels securely
3. Allow engine to cool completely if recently operated
4. Disconnect negative battery cable to prevent accidental starter engagement
5. Raise front of vehicle with floor jack and support securely on jack stands under frame rails

Procedure

1. 1

   Access torque axis mount from above
   Open hood and locate the torque axis mount (dogbone mount) on the driver side of the engine. It runs from the front of the engine block to the frame rail at an upward angle. Identify the upper frame mounting bolt and lower engine bracket mounting bolt.
2. 2

   Apply penetrating lubricant
   Spray both mounting bolt threads and bushings with penetrating lubricant. Allow 10-15 minutes for penetration, especially on original fasteners which are likely corroded from heat and road salt exposure.
3. 3

   Support engine weight
   Position floor jack under a structurally sound lift point (such as the oil pan rail or block, not the center of the pan) with a wood block spread across the jack saddle to distribute load and avoid damaging the pan. Raise jack until it just contacts the pan with slight upward pressure, but do not lift the engine off its other mounts. This prevents the engine from shifting when the torque mount is removed.
4. 4

   Remove upper frame mounting bolt
   Using appropriate socket and wrench, remove the bolt securing the mount to the frame bracket on the driver side frame rail. Confirm the required socket size on your fastener before applying force. Support the mount as you remove the last threads to prevent it from dropping.
5. 5

   Remove lower engine bracket bolt
   Remove the bolt securing the lower portion of the torque axis mount to the engine bracket on the front of the engine block. This may require a combination of socket and wrench to hold the nut while turning the bolt. The mount will now be free from the vehicle.
6. 6

   Remove torque axis mount
   Extract the torque axis mount from the engine bay. It may require some maneuvering and rotation to clear surrounding components. Inspect mounting points on both frame and engine for damage, cracks, or excessive wear.
7. 7

   Compare old and new mounts
   Place the new torque axis mount next to the old unit and verify identical dimensions, bolt hole alignment, and mounting bracket orientation. Confirm bushing sizes match on both ends. Note the orientation of any offset or angle in the mount.
8. 8

   Position new torque axis mount
   Maneuver the new mount into position, aligning the lower end with the engine bracket first. Insert the lower mounting bolt finger-tight only. The engine may need slight adjustment with the floor jack to align holes.
9. 9

   Install upper frame mounting bolt
   Align the upper end of the mount with the frame bracket. Insert and thread the upper mounting bolt finger-tight. You may need to use a pry bar to align the holes if there is slight misalignment due to engine position.
10. 10

    Torque mounting bolts
    With both bolts installed finger-tight, torque the fasteners in the sequence specified by the factory service manual. No verified torque values are available for this platform, so you must obtain and use the manufacturer specification before final tightening. Do not rely on a generic value for heavy-duty engine mount fasteners.
11. 11

    Remove engine support and lower vehicle
    Carefully lower the floor jack from under the oil pan and remove the wood block. Lower vehicle from jack stands and remove stands completely. Reconnect negative battery cable.

Reassembly

1. Ensure all mounting bolts are properly torqued to specification
2. Verify no tools or parts were left in the engine bay
3. Double-check that engine support jack has been removed before starting engine

Verification

• Start engine and allow to idle - there should be no excessive vibration or movement
• Rev engine moderately and observe the torque axis mount - it should compress and extend smoothly without binding or knocking sounds
• Test drive vehicle and accelerate firmly - engine should remain stable without excessive rocking or vibration
• Visually inspect mount after test drive for any signs of movement at mounting points or bushing separation

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