Dog Bone Engine Mount Replacement: A DIY Guide to the Easiest Engine Mount

ByThe Answerlode Editorial Team

Understanding the Dog Bone Engine Mount

The dog bone engine mount, also called a pendulum mount or torque rod, is a critical component that prevents excessive front-to-back movement of your engine during acceleration and deceleration. It works in tandem with your front and rear engine mounts to keep the engine stable and properly positioned. Unlike the other engine mounts, the dog bone mount is mounted horizontally and acts as a stabilizer bar of sorts, controlling engine rock and torque steer.

Interestingly, despite its importance, the dog bone mount is widely recognized as the easiest engine mount to replace on most vehicles. This makes it an ideal first-time DIY project for those looking to save money on labor costs.

Symptoms of a Worn Dog Bone Mount

Knowing when your dog bone mount needs replacement can help you avoid compounding engine damage. Common warning signs include:

  • Excessive engine rocking or movement during acceleration, with the engine visibly tilting 1-2 inches in either direction
  • Jerky takeoff and rough gear changes with noticeable clunking or knocking sounds
  • Vibration transmitted through the cabin, particularly noticeable during hard acceleration
  • Wheel hop or traction loss, caused by the engine moving excessively during power delivery
  • A visible crack in the rubber or complete separation of the mount assembly

If you notice these symptoms, don’t delay. A failing dog bone mount can accelerate wear on your other engine mounts, resulting in a more expensive repair down the road.

Why It’s the Easiest Engine Mount to Replace

The dog bone mount sits in a relatively accessible location and requires no engine support or lifting on most vehicles. Unlike front and rear mounts that require you to support the engine with a jack and wooden block while working underneath, the dog bone mount can typically be accessed from the top engine bay. The procedure is straightforward: unbolt the old mount, slide it out, and bolt in the new one.

The entire job usually takes between 7 and 90 minutes depending on engine bay layout and access. For some vehicles it’s a quick 7-10 minute job, while tighter engine bays may require slightly more time. No special tools are needed beyond basic hand tools.

Tools and Materials You’ll Need

The minimal tool requirement is part of what makes this repair accessible:

  • Socket set (typically 10mm, 13mm, 16mm, or 18mm depending on your vehicle)
  • Ratchet and breaker bar
  • Wrench set
  • Replacement dog bone mount assembly
  • Torque wrench for final installation

You may also want a creeper, work light, or jack if your engine bay access is particularly tight, but these are optional.

Step-by-Step Replacement Procedure

1. Safety First – Park on a level surface, engage the parking brake, and allow the engine to cool completely before beginning work.

2. Access the Mount – Depending on your vehicle, you may need to remove an air intake hose, coolant reservoir, or heat shield to access the mount bolts clearly.

3. Locate and Remove Bolts – The number of bolts varies by vehicle. Most applications involve 2-4 bolts total: typically one or two connecting to the engine block or transmission, and one or two connecting to the chassis or subframe. Use your breaker bar to loosen the bolts, as they can be tight, then remove them completely.

4. Remove the Old Mount – Slide or wiggle the old mount out carefully. It may be held in place by rubber bushings that require gentle persuasion.

5. Install the New Mount – Position the new mount in place and start all bolts by hand first to ensure proper alignment. This prevents cross-threading.

6. Torque to Specification – Using a calibrated torque wrench, tighten each bolt to the manufacturer’s specification in the sequence recommended by your service manual. Torque specs vary widely by vehicle, ranging from 15 ft-lbs to 130 Nm depending on the bolt and application.

7. Final Check – Double-check that all bolts are tight and the mount is secure before reassembling any components you removed for access.

Important: Torque Specifications Matter

One critical detail to emphasize: always consult your vehicle’s factory service manual or the instructions that come with your replacement mount for exact torque values. Specifications vary significantly by make, model, and year. Under-tightening risks the mount loosening during operation, while over-tightening can damage the new mount or strip threads. Many modern mounts require torquing in two stages: an initial torque specification followed by an additional angle tightening (for example, “18 ft-lbs plus 90 degrees”).

OEM vs. Aftermarket: Cost Considerations

Dog bone mount replacement offers significant labor-saving opportunities since you can do this yourself. Parts costs vary considerably:

  • OEM Parts: $80-$150 depending on your vehicle manufacturer
  • Aftermarket Parts: $15-$60 for standard rubber mounts, $50-$150 for upgraded performance mounts
  • Shop Labor (if outsourced): typically $200-$400

By tackling this job yourself, you save the labor cost entirely. Many owners also opt for aftermarket performance mounts with stiffer bushings, which can sharpen throttle response and reduce engine rock more than stock mounts, though at the cost of slightly increased cabin vibration.

Pro Tips for Success

  • Take Photos: Before removing any components, photograph the original mount position and bolt locations for reference during installation.
  • Apply Anti-Seize: If your service manual recommends it, apply a light coat of anti-seize compound to bolt threads to prevent corrosion and make future service easier.
  • Check Related Mounts: If your dog bone mount failed prematurely (within a year or so), have the front and rear engine mounts inspected as well, since premature failure often indicates a broader mount system issue.
  • Use a Torque Wrench: Don’t estimate. A simple click-type torque wrench costs $20-$40 and eliminates guesswork.
  • Verify Alignment: After tightening, the mount should sit evenly without twisting or cocking to one side. Any misalignment suggests improper installation.

When to Call a Professional

While this repair is beginner-friendly, consider professional help if you encounter severely stuck or broken bolts, if your engine bay access is extremely limited, or if you lack basic hand tools. A shop can complete this work quickly and ensure proper torque specification compliance.

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