Crank Seal Belt Failure SOLVED ( N54, N55 owners)

N54 and N55 Crank Seal GuardCrank Seal Belt Failure SOLVED (N54, N55 owners)

BMW N54 and N55 engines are notorious for their high power output and overall joy to drive. These engines were BMW’s first mass produced twin-turbocharged, straight-six gasoline engine that began production in 2006 and lasted until 2016.


The N54 is found in the following BMW models:

  • BMW E90/E91/E92/E93 335i.

  • 2007-2010 BMW E60/E61 535i.

  • 2007-2010 BMW E82/E88 135i.

  • 2007-2010 Alpina B3.

  • 2008-2010 BMW E71 X6 xDrive35i.

  • 2008-2012 BMW F01 740i.

  • 2009-2016 BMW E89 Z4 sDrive35i.

  • 2010-2013 BMW E92/E93 335is.


The N55 is found in the following BMW models:

  • 009–2017 F10/F11/F07 535i.

  • 2010–2013 E90/E91/E92/E93 335i.

  • 2010–2013 E82/E88 135i.

  • 2010–2017 F25 X3 xDrive35i.

  • 2011–2013 E70 X5 xDrive 35i.

  • 2011–2015 F30/F31 335i.

  • 2011–2014 E71 X6 xDrive 35i.

  • 2012–2015 E84 X1 xDrive35i.


A common issue on N54, N55, and S55 engines is the event of the timing belt being sucked into the crank hub area and causing serious damage. We have seen a number of these cars come through our shop in various stages of this problem occurring, from shredded belts, to blown up engines. 


This failure occurs when the timing belt gets sucked into the crank hub area where it can then enter your engine and alter the timing of the engine. When this happens, the belt typically falls apart and can clog the engine oil pickup and starve the engine of oil. If the engine becomes starved of oil and remains running, serious engine damage can and will occur.Seal Failure


VAC Motorsports created a product specifically designed to eliminate the risk of this happening and to provide peace-of-mind for N54, N54, and S55 owners. It is essentially a preventative cover that can be placed over the crank seal so that the timing belt cannot be sucked in the crank hub area.

We have found this product to be a great addition to any N54 or N55 BMW as a preventative maintenance item so that this does not happen, or, a great addition to include on your car when performing a Timing Belt That Has Been Sucked into the Engine.