Genuine 2011 BMW 335i Crankshaft Seal

2011 BMW 335i Crankshaft Seal Parts Questions & Experts Answers

• Q:

  What are the steps involved in replacing the rear crankshaft seal in the N55 six-cylinder engine on a 2011 BMW 335i?

  Posted by Jessica R.

  A:

  An example of crankshaft rear main seal replacement involves working with the transmission and flywheel withdrawn, great care is then used to pack the grooves and the crankcase seams with a special Loctite® sealant to avoid oil leakage. This should be done by detaching the transmission, the clutch pressure plate and disc where the vehicle uses manual transmission and the flywheel. Suck out the engine oil and then remove the magnet wheel from the crankshaft; to prevent pickup of ferrous metal, it is kept in a bag containing a non-magnetic material. Subsequently, take out the screw of the pulse sensor and pull the pulse sensor in order to separate it. Recommended size of the a flat-bottom hole on the radial shaft seal is with maximum 2.5 mm (0.1 inches) drill, and the metal debris should be removed as soon as possible. The seal can be removed with the help of the BMW special tool 23 0 490 with the slide hammer. Place the new radial shaft seal on special tool 11 8 220 and slip it up until it comes in contact with the crankcase prior to the withdrawal of the tool. Screw special tool 11 9 182 on the crank shaft with the help of tool 11 9 184, then join the tools 11 9 185 & 11 9 181. Retract the radial shaft seal with aid of tools 11 9 181 and 11 9 185 and rotate it anti clockwise to the required position to fix the seal. Last, eliminate all special tools and the rest of the installation is performed in the same manner as the removal progress.

  Answered by BMW Parts Specialist Javier / Apr 15, 2023