Motor mounts have two important jobs: They dampen the noise and vibration that is a product of normal engine operation, and support and locate the engine (and transaxle on front-wheel drive vehicles) in the chassis. Isolating noise and vibration from the chassis is important for driving comfort, but keeping the engine in its designed position is even more critical for safe vehicle operation and to prevent component breakage.

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The traditional motor mount consists of two pieces of metal that attach to the engine and chassis respectively, separated by a rubber insulator. Some vehicles have fluid filled hydraulic, or “hydromounts”, that can absorb more vibration without allowing excessive engine movement. The most advanced engine mounts are electronic “active” mounts that are soft at idle to absorb more vibration, but stiffen at higher rpm to limit engine motion.

Defective engine mounts can allow noise and vibration to be transmitted to the chassis and passenger cabin, which can be especially irritating on vehicles with 4-cylinder and V6 engines. Another sure sign of one or more broken mounts is banging and thumping noise under acceleration, caused by the engine’s natural torque reaction. While vibration can be annoying, excessive engine movement is more troublesome because it can negatively affect throttle, clutch and shift linkage operation, and also stress and even break exhaust pipes, radiator hoses and other components.

Motor mounts can fail due to age and exposure to heat and fluids like oil. Rubber mounts can become spongy and “sacked”, or split apart and separate from the metal mounting plates, and hydraulic mounts can leak fluid. If you experience unusual noise and vibration, visually inspect the mounts, and use a pry bar and/or floor jack to unload each mount while checking for damage. Diagnosing active motor mounts may require a scan tool or other equipment, depending on the system. Some vehicles use vacuum operated active mounts and the integrity of these mounts can be checked with a hand-held vacuum pump.

Regardless of the failure or type of motor mount, we have the replacements to restore smooth and safe vehicle operation. All of our mounts are manufactured to meet or exceed original equipment specifications, so you can be assured of precise fitment and easy installation, and OE quality functionality. The only thing you don’t get with our motor mounts is a high price tag. No matter what kind of car or truck you drive, we can supply you with the motor mounts you need for a successful repair, at less cost than you’d pay at the dealer or local parts store, plus you can have them conveniently delivered right to your door.

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Part looks as expected.
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2011 BMW Z4
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