Motor mounts, also known as engine mounts, are crucial components in a vehicle’s engine system. They secure the engine to the chassis and absorb vibrations, ensuring smooth operation. Over time, motor mounts can wear out or fail, leading to excessive engine movement, noise, and potential damage to other components.
Replacing motor mounts is a necessary service to maintain vehicle performance, safety, and comfort. This guide covers everything you need to know about motor mount replacement, including signs of failure, the replacement process, costs, and DIY considerations.
What Are Motor Mounts?
Motor mounts are brackets made of metal and rubber (or sometimes hydraulic fluid-filled) that hold the engine in place. They serve two primary functions:
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Secure the Engine – Prevent excessive movement while driving.
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Absorb Vibrations – Reduce engine noise and harshness transmitted to the cabin.
Most vehicles have multiple motor mounts (typically three or four), including:
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Front motor mount – Near the radiator.
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Rear motor mount – Near the firewall.
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Side motor mounts – On the left or right side of the engine.
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Transmission mount – Supports the transmission (sometimes grouped with motor mounts).
Signs of a Bad Motor Mount
Worn or broken motor mounts can cause noticeable symptoms, including:
1. Excessive Engine Vibration
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The most common symptom of a failing mount is increased vibration, especially at idle or when accelerating.
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The cabin may feel shaky, and the steering wheel might vibrate.
2. Loud Engine Noises
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A broken mount allows the engine to move excessively, leading to clunking, banging, or rattling noises.
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Sounds may worsen when shifting gears or accelerating.
3. Engine Misalignment
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Visibly misaligned engine (tilting to one side).
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Uneven gaps between engine components.
4. Impact on Other Components
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Excessive movement can strain exhaust pipes, wiring, hoses, and drivetrain parts.
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Broken mounts may lead to damaged CV joints, exhaust leaks, or transmission issues.
5. Visible Damage
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Cracks, splits, or oil contamination (hydraulic mounts) indicate failure.
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Rubber deterioration due to age, heat, or oil leaks.
Causes of Motor Mount Failure
Several factors contribute to motor mount wear and failure:
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Normal Wear and Tear – Rubber degrades over time (typically 5-10 years).
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Aggressive Driving – Hard acceleration, sudden stops, or rough roads accelerate wear.
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Oil or Fluid Leaks – Engine oil, coolant, or transmission fluid can weaken rubber mounts.
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Poor Manufacturing – Low-quality mounts fail prematurely.
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Engine Modifications – Increased horsepower or torque can strain stock mounts.
Motor Mount Replacement Process
Replacing motor mounts requires mechanical expertise and proper tools. Below is a step-by-step overview of the process:
1. Diagnosis
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A mechanic inspects the mounts for cracks, leaks, or excessive movement.
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The engine may be lifted slightly to check for play.
2. Vehicle Preparation
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The car is lifted on a hoist or supported with jack stands.
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The battery may be disconnected for safety.
3. Engine Support
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A hydraulic jack or engine support bar holds the engine in place while mounts are removed.
4. Removal of Old Mounts
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Bolts securing the mount to the engine and chassis are removed.
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Some mounts may require removing other components (e.g., air intake, exhaust parts).
5. Installation of New Mounts
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The new mount is positioned and bolted into place.
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Torque specifications must be followed to avoid over-tightening.
6. Reassembly and Testing
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Removed components are reinstalled.
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The engine is started to check for vibrations and noises.
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A test drive ensures proper function.
Cost of Motor Mount Replacement
The cost varies depending on the vehicle make, model, and labor rates:
| Factor | Estimated Cost |
|---|---|
| Parts (per mount) | $50 – $300 |
| Labor (per hour) | $80 – $150 |
| Total Cost (1-3 mounts) | $200 – $1,000+ |
Luxury or performance vehicles may cost more due to complex mounting systems.
DIY vs. Professional Replacement
DIY Replacement (For Experienced Mechanics)
✅ Pros:
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Saves money on labor costs.
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Good for simple mounts (some are easily accessible).
❌ Cons:
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Requires proper tools (jack, engine support, torque wrench).
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Risk of improper installation leading to engine damage.
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Some mounts are difficult to access (e.g., subframe removal needed).
Professional Replacement (Recommended for Most Drivers)
✅ Pros:
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Ensures correct installation and alignment.
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Warranty on parts and labor.
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Saves time and hassle.
❌ Cons:
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Higher cost.
How Long Does Motor Mount Replacement Take?
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Simple mounts: 1-2 hours.
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Complex mounts (requiring subframe removal): 3-5 hours.
Preventive Maintenance Tips
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Regularly inspect mounts for cracks or oil contamination.
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Fix engine oil leaks promptly.
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Avoid aggressive driving to prolong mount life.
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Consider upgraded performance mounts for modified engines.
Conclusion
Motor mount replacement is essential for maintaining a smooth, quiet, and safe driving experience. Ignoring worn mounts can lead to costly engine or transmission damage. If you notice excessive vibrations, noises, or engine movement, have your mounts inspected by a professional mechanic.
Whether you choose a DIY approach or professional service, timely replacement ensures your vehicle runs smoothly for years to come.
FAQs
1. How often should motor mounts be replaced?
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Typically every 5-10 years, but inspect them if symptoms arise.
2. Can I drive with a broken motor mount?
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Not recommended—excessive engine movement can damage other components.
3. Are aftermarket motor mounts reliable?
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Yes, but choose reputable brands (e.g., Anchor, Energy Suspension, OEM).
4. Do electric cars have motor mounts?
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Yes, but they may have fewer due to reduced vibration.
5. Can bad motor mounts affect transmission?
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Yes, excessive movement can strain transmission linkages.
By understanding motor mount replacement, you can ensure your vehicle remains reliable and comfortable for the long haul. If in doubt, consult a trusted mechanic for an inspection.