S55 Crank Hub Fix for the M3 / M4 / M2C S55
WHAT IS A “KEYED CRANK HUB UPGRADE” AND WHY DO I NEED IT?
The keyed crank hub upgrade is a replacement of your stock crank hub unit with a unit that has two “keys” or “pins” for which 2 holes are drilled into the S55 crankshaft so that upon installation of the crankshaft bolt the new keyed crank hub can be locked into place permanently without a chance of relative rotation to the crankshaft. We use the Maximum PSI Crank Hub or the now known Max psi keyed crank hub. This allows further insurance against the chance of the crank hub “slipping” or “spinning” and un-syncing the relative angles between the crankshaft and camshafts (this can mean engine failure which will cost upwards of $20,000 to replace or at the very least leave you stranded and un-driveable until the crank hub is replaced and engine is retimed). This SCH failure has been seen on both modified and stock S55 engines. If you are modifying your car, tracking your car, or even driving spiritedly, then upgrading your crank hub is highly recommended.
IS MY CAR ON THE LIST OF AFFECTED VEHICLES?
2015+ BMW F8X M3 / M4 (CS / GTS)
2019+ BMW F87 M2C
And any other variation of BMW models utilizing the S55 engine
WHAT WILL BE NEEDED TO REPLACE MY STOCK CRANK HUB?
Two-Piece Keyed Crank Hub Kit PURCHASE HERE!
OEM Gaskets & Parts Needed
∙ Valve Cover Gasket Set
∙ Front Crank Seal - Crankshaft Seal
∙ Bolt for Timing Chain Sprocket - Intake/Exhaust Camshaft
∙ Cover Seal for Brake Booster Vacuum Pump
∙ Oil Pan Gasket
∙ Engine Oil Pan Bolt Kit (Aluminum)
∙ Coolant / Antifreeze (Blue) (1 Gallon)
∙ Engine Oil - 5W-30 Synthetic (7 Liters)
∙ Oil Filter Kit
∙ Valve Cover R&R (8.2 hours BMW book time)
∙ Oil Pan R&R (8.4 hours BMW book time)
∙ Front Crank Seal R&R (5.6 hours BMW book time)
∙ Drilling Crankshaft (1.5 hours approximated)
∙ Crank Hub R&R w/ proper torquing procedure and retiming engine (1.5 hours approximated)
Total Approximate Labor Hours: 25.2 Hours (BMW specialty tools required)