Engine Mount - Torque Axis

Replace the torque axis engine mount (also called dogbone mount or torque reaction mount) that controls engine movement under load on the 5.9L Cummins diesel.

Warnings

Tools required

Parts

• Torque axis engine mount (dogbone mount) × 1 — Use OEM specification or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Chock rear wheels
3. Allow engine to cool completely if recently operated
4. Gather all tools and the replacement mount
5. Apply penetrating oil to mount bolts and allow to soak for 15-30 minutes if visible corrosion is present

Procedure

1. 1

   Raise and support vehicle
   Raise the front of the vehicle using a floor jack at the front crossmember. Place jack stands under the frame rails behind the front wheels. Lower vehicle onto jack stands and verify stability before proceeding.
2. 2

   Locate torque axis mount
   From under the vehicle, locate the torque axis mount on the driver side of the engine. This mount runs from the engine block or oil pan area to the frame rail or crossmember at an angle. It is typically positioned near the front of the engine, below the exhaust manifold area.
3. 3

   Support engine weight
   Position a floor jack with a wood block under the oil pan or transmission bell housing to support the engine weight. Raise jack until it just contacts the engine but does not lift it. This will prevent excessive engine movement when the mount is removed.
4. 4

   Remove frame-side mount bolt
   Using an 18mm or 21mm socket (depending on year and mount style), remove the bolt securing the torque axis mount to the frame rail or crossmember. This is typically the bolt on the passenger side of the mount. Support the mount while removing the bolt to prevent it from dropping.
5. 5

   Remove engine-side mount bolt
   Remove the bolt securing the torque axis mount to the engine block or mounting bracket on the driver side. Use the appropriate size socket (typically 18mm or 21mm). The engine may shift slightly when this bolt is removed; this is normal if the jack is properly positioned.
6. 6

   Remove old mount
   Remove the torque axis mount from the vehicle. It may be necessary to use a pry bar to work the mount out if the rubber bushings are binding. Inspect the mounting brackets on both the engine and frame for damage, cracks, or excessive wear. Clean mounting surfaces with a wire brush if necessary.
7. 7

   Compare old and new mounts
   Verify the new mount matches the old mount in length, bushing diameter, and bolt hole spacing. Check that the new mount's bushings are in good condition with no tears or separation from the metal sleeves.
8. 8

   Install new mount to engine bracket
   Position the new torque axis mount and start the engine-side bolt by hand. Do not tighten fully yet. Ensure the mount bushing is properly seated in the bracket and the bolt threads engage smoothly without cross-threading.
9. 9

   Install frame-side bolt
   Align the frame-side end of the mount with its mounting bracket. You may need to use the floor jack to slightly adjust engine position to align the holes. Start the frame-side bolt by hand. If alignment is difficult, a pry bar can be used to carefully move the mount into position.
10. 10

    Torque mount fasteners
    With both bolts started, tighten the mount fasteners to the manufacturer's documented torque specification for this vehicle and engine. Do not use a generic value — consult the factory service manual for the exact torque and tightening sequence before final tightening.
11. 11

    Remove jack support
    Carefully lower and remove the floor jack from under the engine. The engine weight should now be supported by all mounts including the newly installed torque axis mount.
12. 12

    Lower vehicle
    Raise the vehicle slightly with the floor jack, remove the jack stands, and carefully lower the vehicle to the ground.

Reassembly

1. Ensure all fasteners are properly torqued to specification
2. Verify no tools or parts were left in the engine compartment or under the vehicle

Verification

• Start the engine and observe the mount for proper alignment and no excessive movement
• With engine running, shift transmission through all gears and verify no abnormal engine movement or vibration
• Test drive vehicle and note any improvement in vibration or clunking during acceleration and deceleration
• Re-check mount bolt torque after first 50-100 miles of operation
• Listen for any unusual noises that might indicate improper installation

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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