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Remove/install right cylinder head cover - AR01.20-P-5012EL

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ENGINES 272, 273 (except 272.983) in MODEL 212 

Fig 1: Right Cylinder Head Cover Remove/Install Components
G09973764Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
NOTES Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
1 Turn key in ignition lock to position "0"    
2 Remove air filter housing   AR09.10-P-1150EWS
3 Remove bolts (1a) and remove bracket (1) for front engine cover with air pump switchover valve (Y32) TORQUE SPECIFICATION *BA01.30-P-1009-01O 
4 Remove right air shutoff valve (2)   AR14.30-P-7200EW
5 Remove front cover (3) on the right cylinder head   AR01.30-P-5700EWR
6 Remove ignition coils at right cylinder head   AR15.12-P-2003EW
7 Remove cover (4) on centrifuge   AR01.20-P-2100EWS 
8 Disconnect right connector (R) at ME-SFI [ME] control unit (N3/10)    
9 Detach ME-SFI [ME] control unit (N3/10) from control unit brackets (5l, 5r) and lay to one side IMPORTANT Do not  disconnect left connector (L) at ME-SFI [ME] control unit (N3/10).  
10 Remove right control unit bracket (5r) TORQUE SPECIFICATION *BA07.08-P-1002-01A 
11 Detach ground line (6) from cylinder head cover (7) TORQUE SPECIFICATION *BA01.30-P-1010-01O 
12 Remove feed duct (8) from resonance intake manifold (9), cylinder head cover (7) and rear right engine lifting eye (10) and place to one side TORQUE SPECIFICATION *BA15.18-P-1001-01B 
    TORQUE SPECIFICATION *BA15.18-P-1002-01B 
    TORQUE SPECIFICATION *BA15.18-P-1003-01B 
13 Loosen bolts for cylinder head cover (7) in reverse order of tightening procedure and remove them Engine 272 AR01.20-P-5014-03VA
    Engine 273 AR01.20-P-5014-03SX
    TORQUE SPECIFICATION *BA01.30-P-1004-01O 
14 Carefully pry off cylinder head cover (7) from cylinder head NOTES To avoid damaging sealing surfaces, do not pound in the prying tool between the cylinder head cover (7) and the cylinder head.
INSTALLATION IMPORTANT Apply sealing compound to cylinder head cover (7):
 
IMPORTANT Notes on sealant path for cylinder head cover Engine 272 AH01.30-P-1000-08V
IMPORTANT   Engine 273 AH01.30-P-1000-08SX
    SPECIAL TOOL Fig 2
    Loctite sealant 5970 *BR00.45-Z-1013-01A 
CLEANING Clean     
15 Clean sealing surfaces at cylinder head and at cylinder head cover (7) NOTES 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 
16 Install in the reverse order    
INSPECT Checking     
DANGER 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
17 Conduct engine test run and check engine for leaks while it is running    
CYLINDER HEAD

Number Designation Engine 272 Engine 273
BA01.30-P-1004-01O Bolt, cylinder head cover to cylinder head M7 Stage 1 Nm 12 12
  Stage 2 ∠° 90 90
BA01.30-P-1009-01O Bolt, switchover valve bracket to cylinder head M6 Nm 9 9
BA01.30-P-1010-01O Bolt, ground line to cylinder head cover M6 Nm 9 9
CONTROL UNIT

Number Designation Engine 272 Engine 273
BA07.08-P-1002-01A Bolt, control unit bracket to resonance intake manifold Nm 8 8
ENGINE WIRING HARNESS

Number Designation Engine 272 Engine 273
BA15.18-P-1001-01B Bolt, feed duct to resonance intake manifold Nm 8 8
BA15.18-P-1002-01B Bolt, feed duct to cylinder head cover Nm 8 8
BA15.18-P-1003-01B Bolt, feed duct to engine lifting eye Nm 8 8
Fig 2: Identifying Squeeze Gun (112 589 00 25 00)
G09973765Courtesy of MERCEDES-BENZ USA
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1013-01A Loctite sealant 5970 A 003 989 98 20
BR00.45-Z-1038-04A Loctite 7200 Henkel Loctite Deutschland GmbH
BR00.45-Z-1046-04A Cleaning spray, Loctite 7063 (150ml) A 001 986 71 71 10