Remove/Install Coolant Pump - AR20.10-P-1271MNA

Engine 176 in model 463 up to model year 2019 

Engine 177 in model 205 

Engine 178 in model 190 

Shown on ENGINE 177 

Fig 1: Coolant Pump Components Location - Engine 176 In Model 463 Up To Model Year 2019 (Shown On Engine 177)

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove coolant thermostat	Engine 178 in model 190	AR20.10-P-2461MNB
		Engine 176 in model 463 up to model year 2019 Engine 177 in model 205	AR20.10-P-2461MNA
2	Remove screw/bolts (19) and take off coolant pump (20)	During installation of the coolant pump (20) ensure that the toothing of the coolant pump (20) engages in the toothing of the drive. The coolant pump (20) cannot be introduced to the end stop otherwise. Replace seals for coolant pump (20).
		Bolt, coolant pump to crankcase	*BA20.10-P-1001-01ZA
3	Install in the reverse order
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
4	Perform an engine test run, check engine cooling system for proper operation and leaktightness