Download: BMW double VANOS rattle fix (1/3)

By SafarK


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Replacement of the BMW double VANOS bearing rings with modified rings from Beisan Systems.
Under certain circumstances (usually under load at +- 2000rpm) a rattling noise can be heard from the engine; most commonly when high performance camshafts, or (in my case) a supercharger is installed. This effect is caused by axial play in the VANOS pistons. Replacing a certain component (the bearing ring) has been found to reduce this rattle.
This video shows the axial play between the VANOS piston and the camshaft helical gear set, prior to replacement of the bearing ring.