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

ENGINE 642 in MODEL 221 

Shown on left cylinder head cover 

Fig 1: Identifying Left Cylinder Head Cover Remove/Install Components

Courtesy of MERCEDES-BENZ USA

Shown on right cylinder head cover 

Fig 2: Identifying Right Cylinder Head Cover Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of explosion  caused by ignition of flammable products, risk of poisoning  caused by inhaling fuel vapors or swallowing fuel as well as risk of injury  to skin and eyes exposed to fuel.	No fire, sparks, open flames or smoking. Only pour fuels into suitable and appropriately marked containers. Wear protective clothing when handling fuel.	AS47.00-Z-0001-01A
	Risk of explosion  from 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
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
1	Remove engine intake air duct downstream of air filter		AR09.10-P-8130SXI
2	Remove engine charge air duct on turbocharger		AR09.41-P-8622SXI
3	Remove exhaust gas recirculation positioner		AR14.20-P-1020SXI
4	Remove injectors		AR07.16-P-1000SXI
5	Remove rail		AR07.03-P-1010SXI
6.1	Unscrew power steering pump expansion reservoir	apart from with Active Body Control (ABC) On left cylinder head cover.	AR46.25-P-1000SXI
7	Detach fuel line (1)	On left cylinder head cover. The fuel line (1) is to be removed with flexible feed and return hose so that power steering pump reservoir can be placed aside.
8	Loosen oil dipstick guide tube (3)	On left cylinder head cover. Loosen oil dipstick guide tube (3) at the top and bottom. A small amount of oil may flow out, this should be caught.
		Bolt for dipstick guide tube	*BA18.40-P-1001-01M
9	Loosen cylinder head cover bolts in stages; remove	On left cylinder head cover. Loosen cylinder head cover bolts in reverse order of the tightening procedure on a cooled off engine so that the cylinder head cover does not shift, see: ↓
		Bolt tightening procedure for cylinder head cover Observe tightening procedure and tightening instructions for cylinder head cover bolts so that the cylinder head cover does not shift and lead to damage to the camshaft, see: ↓	AR01.20-P-5014-03SXI
		Bolt tightening procedure for cylinder head cover	AR01.20-P-5014-03SXI
		Bolt connecting cylinder head cover to cylinder head	*BA01.20-P-1001-01P
10	Remove left cylinder head cover	Detach left cylinder head cover with impact extractor and threaded stud, then remove.
	Notes on sealant path for cylinder head cover		AH01.30-P-1000-08SXI
		Threaded stud	Figure
		Impact extractor	Figure
		Loctite sealant 5970	*BR00.45-Z-1013-01A
11	Remove connecting pipe to coolant expansion reservoir
12	Remove connection fitting for oil separator (5)	On right cylinder head cover. Replace O-ring and radial shaft sealing ring.
13	Detach electrical connector from the camshaft Hall sensor (B6/1)	On right cylinder head cover.
14	Loosen cylinder head cover bolts in stages; remove	On right cylinder head cover. Loosen cylinder head cover bolts in reverse order of the tightening procedure on a cooled off engine so that the cylinder head cover does not shift, see: ↓
		Bolt tightening procedure for cylinder head cover Observe tightening procedure and tightening instructions for cylinder head cover bolts so that the cylinder head cover does not shift and lead to damage to the camshaft, see: ↓	AR01.20-P-5014-03SXI
		Bolt tightening procedure for cylinder head cover	AR01.20-P-5014-03SXI
		Bolt connecting cylinder head cover to cylinder head	*BA01.20-P-1001-01P
15	Remove right cylinder head cover	Detach cylinder head cover using impact extractor and threaded studs, then remove.
	Notes on sealant path for cylinder head cover		AH01.30-P-1000-08SXI
		Threaded stud	Figure
		Impact extractor	Figure
		Loctite sealant 5970	*BR00.45-Z-1013-01A
	Clean
16	Clean sealing surface on cylinder head covers and cylinder heads	Do not use any sharp-edged tools or abrasive paper as this will damage the sealing surfaces.	AR01.00-P-0050-01A
		Loctite 7200	*BR00.45-Z-1038-04A
		Cleaning spray, Loctite 7063 (150ml)	*BR00.45-Z-1046-04A
17	Install in the reverse order
	Checking
18	Check engine oil level	In order to avoid measurement errors, vehicle must be parked on an even surface. Inspect engine oil level about 5 min. after switching off warm engine	AR18.00-P-3035-01SXI
19	Check for oil leaks with engine running
20	Check fuel system for leaks with engine running

Fig 3: Identifying Impact Extractor (116 589 20 33 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Threaded Stud (102 589 00 34 00)

Courtesy of MERCEDES-BENZ USA