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Technology changes result in more requirements for engine mount performance |
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Wednesday, 02 May 2007 |
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Page 2 of 2
Magneto-rheological system
One equipment maker is developing yet another type of mount, a magneto-rheological (MR) fluid powertrain mount. Damping properties of the mount are controlled instantly during a variety of road surface conditions by adjusting the state of the fluid. The MR powertrain mount also helps control engine vibrations.
The MR powertrain mount system works with both front- and rear-wheel-drive engine mounting configurations. An MR powertrain mount system includes the appropriate MR mount(s), sensor(s), an electronic control unit, and the associated wiring.
Damage analysis
When analyzing damage on an active engine mount system check for visible damage. Inspect hydraulic or electronic engine mounts for fluid leaks, damaged or pinched vacuum hoses, improper connections, or damaged electrical parts.
When analyzing damage on an engine mount assembly on a 2007 Lexus RX350, apply a vacuum to the engine mount and verify that there is no change in the needle movement of the vacuum pump gauge. If vacuum pressure remains steady, the engine mount assembly is good. If the vacuum pressure drops or no vacuum pressure exists, the engine mount assembly needs to be replaced.
Replacing an engine mount
Replacing an engine mount can be a challenge. It will typically require working from both above and below the vehicle. Replacing an active engine mount requires additional attention to electrical and vacuum actuators and connections.
Replacing an engine mount may require raising and supporting the engine. Raising and supporting the engine requires using the proper equipment and following appropriate procedures. Always check for clearance before attempting to raise the engine to avoid damage to adjacent parts that could get pinched or crushed.
Always use safe working practices when inspecting or replacing engine mounts. Use the appropriate tools and follow vehicle maker recommendations.
Conclusion
Changes in vehicle technology are making the use of standard engine mounts inefficient. Active engine mount systems can provide the engine support properties required in newer vehicles along with improved engine idle and road surface vibration control.
Vehicles equipped with an active engine mount system can make analyzing damage and collision repair more challenging. As more vehicle makers use active engine mount systems in vehicle construction, technicians and estimators will need to keep current on engine mount technology.
This article first appeared in the I-CAR Advantage Online, which is published and distributed free of charge. I-CAR, the Inter-Industry Conference on Auto Collision Repair, is a not-for-profit international training organization that researches and develops quality technical education programs related to collision repair.
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