The broken pieces of valve have no where else to go except through the intake manifold runners and through the motor, sometimes resulting in severe engine damage. This uncontrolled movement can lead to complete destruction of the flapper valve. The brittle flapper valve becomes free to slap around uncontrolled within the DISA support framework. Once the hex is shape is worn off the lever, the flapper valve no longer opens and closes in a controlled manner by the rotation of the bell crank lever. The symptoms of a worn DISA valve include rough idle, lean engine codes and lack of low to mid rpm power.If you disassemble a worn out DISA valve and look at the bell crank lever it\'s common to not even recognize that it once had a hex shape on the protrusion. As soon as the erosion starts it\'s all down hill from there until the hex is completely worn away. These vibrations start a wear process which will cause the tiny glass fibers in the flapper valve to erode away the male hex portion of the weaker bell crank lever. The failure is caused by the type of materials used in the manufacture of two of the three key valve components.During normal engine operation the bell crank lever and flapper valve vibrate against each other where the hex shaped portions contact each other. BMW BM54 REPAIR KIT UPGRADEGerman Auto Solutions GAS BMW M54 3.0L DISA Repair and Upgrade Kit WARNING - This kit fits 3.0 liter M54 BMW\'s ONLY!The 2.5 and 2.2 liter M54 BMW\'s uses a separate kit.Use this link to choose the 2.5 liter version.Please verify that our kit fits your BMW by clicking the \"Applications\" tab.Please click the other tabs for help in selecting your kit and options.The DISA valve, otherwise known as the \"Intake Manifold Adjuster Unit\", is located on the side of the intake manifold and is a common failure on the M54 BMW engines.
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