Not recommended to drive long distances. If you must move the car, arrange a tow or drive only a short distance to a repair shop with caution.
Motor mounts secure the engine and transmission to the chassis and damp vibration. When they fail, you can experience clunking noises, increased cabin vibration, and noticeable engine movement. This article explains what motor mounts do, how they fail, the risks of driving with worn mounts, and what to do if you suspect a problem.
What motor mounts do and how they fail
Function of engine and transmission mounts
Motor mounts anchor the engine and transmission to the vehicle frame, absorb torque, and damp vibrations so the ride remains smooth and components stay properly aligned. They are typically made of rubber or a combination of rubber and metal, with some hydraulic designs for enhanced dampening.
How mounts wear or break
Over time, the rubber can crack or harden, hydraulic chambers can leak, and mounting bolts or studs can loosen. This allows greater engine movement, which can lead to increased vibration, misalignment of belts and hoses, or even the engine contacting other components under certain conditions.
Is it safe to drive with bad mounts?
Driving with worn or broken mounts can worsen damage to the engine bay and related systems. In moderate cases you may still drive short distances, but the risk of further wear, unintended engine movement, and potential component damage increases with time and use.
Watch for these common symptoms to gauge severity:
- Clunking, banging, or thudding noises when you accelerate, decelerate, or go over bumps.
- Excessive vibration in the steering wheel, pedals, or cabin, especially at idle or under load.
- Visible engine movement or rocking when the car is in gear or under torque.
- Rubber mounts appearing cracked or deteriorated, or misalignment of nearby components like the exhaust, hoses, or wiring.
- Unusual engine movement during shifting or unexpected shifts in power delivery.
If you notice these signs, limit driving and arrange a professional inspection as soon as possible. A single failed mount can sometimes be driven a short distance, but reliability is unpredictable and the risk of collateral damage increases with continued use.
What to do if you suspect damaged mounts
Taking precautions now can prevent further damage and costly repairs. Here are steps to follow:
- Do not rely on the car for long trips. If possible, arrange towing or roadside assistance to a repair facility.
- Minimize engine movement if you must move the car: drive slowly, on smooth roads, with light loads, and avoid high speeds or sharp maneuvers.
- Have a qualified mechanic inspect the mounts and check for collateral damage to belts, hoses, exhaust, and transmissions.
- Ask about replacing mounts in matched sets, as uneven wear can place extra stress on remaining mounts.
- Obtain a detailed estimate that itemizes parts and labor, and understand whether other drivetrain components may need attention during replacement.
These steps help reduce the risk of additional damage and ensure the engine is properly supported during and after repair.
Costs, repairs, and maintenance
Repair costs vary widely by vehicle, mount type, and labor rates. Replacing a single engine mount typically involves parts and several hours of labor, with total costs ranging from a few hundred to over a thousand dollars per mount in some cases. If multiple mounts need replacement, the expense can rise significantly. Some vehicles also require additional work on transmission mounts or related subcomponents.
- Parts cost: depends on OEM vs aftermarket parts and whether hydraulic or solid mounts are used.
- Labor cost: influenced by access, vehicle design, and whether components must be moved or removed to reach mounts.
- Total estimate: often several hundred to a few thousand dollars per vehicle, depending on the number of mounts and complexity.
- Additional checks: it’s common to inspect belts, hoses, exhaust, and wiring for wear or damage during mount replacement.
Prices vary by model, region, and shop. Getting multiple quotes and confirming the scope of work helps avoid surprise costs.
Summary
Motor mounts are essential for keeping the engine and transmission aligned while dampening vibrations. When they wear or break, driving can become noisy, uncomfortable, and riskier due to potential collateral damage. If you suspect bad mounts, have them inspected promptly by a professional, avoid lengthy drives, and plan for repair or replacement to restore safety and ride quality. A timely fix typically protects the engine bay and drivetrain from further harm and brings the vehicle back to normal operation.
What kills engine mounts?
What Causes Worn Engine Mounts?
- - Ageing Over Time.
- - Poorly Installed Engine Mounts.
- - Poor Driving Habits that Damage Your Vehicle Parts.
- - When Your Vehicle Has Been Involved in a Crash.
- - Fluid Leaks onto the Engine Mounts.
How long can you drive with bad motor mounts?
Driving with a bad motor mount is inadvisable. It is technically possible to drive short distances, but prolonged use will inevitably destroy your motor mount beyond repair. When you replace a motor mount, be sure to replace every single motor mount.
How much does it cost to fix bad motor mounts?
The average cost for an Engine Mount Replacement is between $607 and $747. Labor costs are estimated between $294 and $431 while parts are priced between $313 and $316. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
What causes the mount to fail?
Typical causes of such leaks include long use of the mount, excessive shock loads to the mount as the result of an accident or striking a pothole or other obstacle, as well as incorrect or sloppy installation of an active engine mount.