Remove/install cylinder head cover · ar0120p5014cd · Mercedes-Benz WIS

AR01.20-P-5014CD

Remove/install cylinder head cover

09.08.2019

Engine

651 in model 166, 172, 204, 207, 212, 218, 221

Modification notes

05.08.2019

AH05.20-P-1000-09SZ, added.

Operation step 10

P01.20-2237-09

Shown on model 204

7	Electrical connectors	B4/6	Rail pressure sensor	B76/1	Condensation sensor for fuel filter with heating element
8	Electrical connector	B6/1	Camshaft Hall sensor	M55	Intake port shutoff actuator motor
9	Mounting clips	B60	Exhaust pressure sensor	Y74	Pressure regulator valve
10	Wiring shaft

P01.20-2229-08

1	Vent hose for crankcase ventilation system	4	Banjo bolt
2	Cylinder head cover	B6/1	Camshaft Hall sensor
3	Bolts

P01.20-2230-07

3	Screw		6	Groove
5	Seal

 Danger	Risk of explosion caused by fuel igniting. Risk of injury to skin and eyes caused by fuel spraying out at high pressure	Keep all ignition sources out of hazard area. Do not carry out any work on system when it is pressurized.	AS07.16-Z-0001-01A
	Notes about Common-Rail components		AH07.16-P-0002-01TX
 	Remove/install
1	Remove cylinder head cover trim (2).
2	Remove section of the left and center partition.	Model 166
3	Remove air filter housing.		AR09.10-P-1150CD
4	Detach vent hose of the crankcase ventilation system (1).
5	Remove injectors.		AR07.16-P-1000CD
6	Disconnect electrical connectors (7).
7	Disconnect electrical connector (8).	MODEL 172, 204, 207, 212, 218, 221
8	Release mounting clips (9), lift wiring shaft (10) with engine wiring harness, and place to one side somewhat.	 Installation: Attach cable bracket, which was removed during removal, back into the same position during installation.
9	Remove banjo bolt (4) and remove return line from the rail.	 Seal connections after unscrewing.
		 Installation: Install new sealing rings.
		 Banjo bolt, return line to rail	*BA07.16-P-1004-01H
10	Remove screws (3) and remove cylinder head cover (2).
	General information on checking camshafts and bearing points of camshafts		AH05.20-P-1000-09SZ
		 Installation: Replace seal (5) on cylinder head cover (2). Push seal (5) over the collar of the respective screw/bolts (3) and press into the slot (6) around the whole circumference.
		 Screw/bolt, cylinder head cover to cylinder head	*BA01.20-P-1001-01Q
11	Install in the reverse order.
 Warning	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
12	Check leak tightness of the fuel system and cylinder head cover (2) with the engine running.

 Crankcase ventilation, cylinder head cover

Number	Designation		Engine 651
BA01.20-P-1001-01Q	Screw/bolt, cylinder head cover to cylinder head	Nm	9

 Common rail diesel injection (CDI)

Number	Designation		Engine 651
BA07.16-P-1004-01H	Banjo bolt, return line to rail	Nm	25

Referenced documents

ah0520p100009sz General information on checking camshafts and bearing points of camshafts
ah0716p000201tx Notes about Common-Rail components
ar0716p1000cd Remove/install injectors
ar0910p1150cd Remove/install air filter housing
as0000z000501a 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.
as0716z000101a Risk of explosion caused by fuel igniting. Risk of injury to skin and eyes caused by fuel spraying out at high pressure