VANOS Seals Repair Kit, Beisan - E46 323i/325i/328i/330i, E39 525i/528i/530i, E60 525i/530i, E83 X3, E53 X5, Z3 E85 Z4

BS001

Rebuilding and replacing the seals in double-VANOS engines is pretty easy and straightforward, restoring lost engine power, smoothness, and refinement. This kit includes two seals and two o-rings for each Vanos piston and a new o-ring for each plastic piston cap. These o-rings and seals feature an upgraded material (Viton) over the factory seals that tend to weaken and break down over time. The loss of oil pressure due to worn seals affects Vanos operation, reducing torque especially in the low and mid-RPM range.

Replacing the M52TU/M54 Vanos seals is done with the Vanos unit removed from the engine. It's a standalone repair - not really shared with any other work except a valve cover gasket or top-end valvetrain overhaul. We strongly suggest purchasing a top-end gasket kit that will include all of the other gaskets and seals needed when opening up the cylinder head of the engine.

With the Vanos disassembled, this is also the only time to replace the rings that cause “marble in a can” Vanos rattles. The Beisan anti-rattle rings are produced with a tighter size tolerance to reduce play and gaps and eliminate Vanos rattle.