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2005 Jeep Liberty Noise, Vibration and Harshness Improvements

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2005 Jeep Liberty CRDAuburn Hills, MI - To reduce the NVH levels of the Liberty diesel, Jeep engineers made dozens of improvements affecting the engine and body-in-white. All of these improvements can be classified in one of three types: the source of the NVH, the structure of the vehicle and acoustics.
Source - Since the engine is the primary source of undesirable NVH levels, improvements to the 2.8-liter turbo diesel include engine balance shafts, a new noise-reducing engine cover, and a torque converter turbine damper. Also, an air induction resonator reduces induction noise emissions.

Structure - The structure of the Liberty was also reengineered. Improved engine mounts, called hydro mounts, function in a manner similar to shock absorbers. The fluid within the mounts provides isolation and damping, which reduces the amount of vibration and harshness that reaches the body. In another application, the dash, plenum and the body-in-white panel consist of a dampening material sandwiched between two metal layers. This process of stiffening and dampening the sheet metal reduces the amount of noise that travels into the vehicle.

Acoustics - Airborne noise is kept from the passenger compartment of the Liberty diesel in a number of ways. For example, an acoustic belly pan is attached beneath the engine to absorb its noise. Noise is also absorbed via an engine compartment hood liner. And the cabin contains noise-absorbing carpet.

"The 2.8-liter turbo diesel engine performs better and pollutes less than previous diesel engines, while delivering reduced NVH levels," said Love. "In tandem with the proven capability of the Jeep Liberty, this engine gives sport-utility owners and prospects an exciting new driving opportunity."


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