Toyota 4Runner Engine Balance Shafts

A balance shaft is a device used for damping vibrations in the engines that cannot be inherently balanced. Typically, a balance shaft is installed in large-displacement inline-four engines. Due to their design asymmetry, I4 engines cause vibrations no matter how well the rotating assembly is balanced. With the displacement increasing, the unbalanced force rises and so does the magnitude of vibrations experienced by the assembly. While remaining acceptable in the engines with the displacement under 2.0 liters, the unbalanced force is considered adverse in larger engines. And that’s the reason why they employ balance shafts.

In the Toyota 4Runner engine lineup, balance shafts can be found inside the crankcases of some of the third and five-generation vehicles. Balance shafts are power consumers that can take up to 10% of the engine output. With the bearings or drive system components wear, this figure grows and so does the shaft load. Thus, if your 4Runner experiences balance shaft issues, you’d better get them addressed in the shortest time. With our Toyota 4Runner balance shafts & components and prompt delivery, you can easily achieve that goal.