Engine Coolant Water Pump
 
For M270 Engine
Including M270.910 and M270.920
 
A Class - A160, A180, A200, A250 (W176 - Years 2013-2018)
B Class - B160, B180, B200 (W246 - Years 2011-2018)
CLA - CLA180, CLA200, CLA220, CLA250 (C117 - Years 2013-2019)
 
1.6 and 2.0 Petrol Turbo Engines
 
It is common for the pulley bearing to fail on these water pumps, causing a grinding sound when running.