Remove/install cylinder head cover - AR01.20-P-5014H

ENGINES 275, 285

Fig 1: Identifying Cylinder Head Cover Remove/Install Components - Shown On Left Cylinder Bank

Courtesy of MERCEDES-BENZ USA

Shown on left cylinder bank

	Remove/install
1	Remove left or RH ignition coil module	Engine 275	AR15.12-P-1100LA
1	Remove left or RH ignition coil module	Engine 285	AR15.12-P-1100H
2	Disconnect electrical connector from left or right camshaft Hall sensor (B6/2, B6/3)
3	Close off left or RH coolant hose (1) from the coolant line (2)	Check coolant hose (1) and hose clamp; replace if necessary.
	Left cylinder head cover
4	Remove bolt (3)
5	Close off hose (4) for crankcase ventilation system from the centrifuge (5) and set aside the hose (4)
	Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
6	Drain coolant at radiator		AR20.00-P-1142H
7	Remove coolant line (6) and set aside with connected coolant hoses	Install new O-ring.
		Bolt, coolant line to coolant thermostat housing	*BA20.10-P-1005-01C
		Bolt connecting coolant line to cylinder head	*BA20.10-P-1006-01C
8	Remove bolts (7, 12 pieces) and remove left cylinder head cover (8)	↓
		Check for correct seating of the cylinder head cover gasket.	AR01.20-P-5014-01H
			*BA01.20-P-1001-01E
	Right cylinder head cover
9	Remove pneumatic lines at the rear from cylinder head cover	Install new cable ties.
10	Remove bolts (7, 14 pieces) and right cylinder head cover (8)	↓	*BA01.20-P-1001-01E
10		Check for correct seating of the cylinder head cover gasket. Inspection mirror	AR01.20-P-5014-01H
11	Install in the reverse order

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation			Engines 137, 275	Engine 285
BA20.10-P-1005-01C	Bolt, coolant line to coolant thermostat housing	M6	Nm	8	8
BA20.10-P-1006-01C	Bolt connecting coolant line to cylinder head	M6	Nm	8	8

CRANKCASE VENTILATION, CYLINDER HEAD COVER

Number	Designation			Engines 275.95, 285.95	Engine 275.98, 285.98
BA01.20-P-1001-01E	Cylinder head cover bolt	Stage 1	Nm	9	4
BA01.20-P-1001-01E	Cylinder head cover bolt	Stage 2	∠°	-	120