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Home >> Mercedes Benz >> 2021 >> CLS450 Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Complete Engine - 257 Chassis >> Testing & Repair >> Remove/Install Rear Cover On Cylinder Head - AR01.30-P-5702MSA

Remove/Install Rear Cover On Cylinder Head - AR01.30-P-5702MSA

Engine 256.9 in model 213, 238, 257, 290 

Fig 1: Rear Cover On Cylinder Head Components Location - Engine 256.9 In Model 257
G14548000Courtesy of MERCEDES-BENZ USA
CAUTION Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.
AS00.00-Z-0017-01A
CAUTION Risk of injury  to skin and eyes due to handling of engine oil. Risk of poisoning  caused by swallowing engine oil Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.
AS18.00-Z-0001-01A
Notice  Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
REMOVINGINSTALLING Remove/install     
1 Remove engine air intake duct downstream of air filter.   AR09.10-P-8130MSA
    INSTALLATION IMPORTANT Do not install upper engine cover until after the leak test.  
2 Remove front noise insulation.    
3 Remove wide open throttle bleed line from oil separator.   AR01.20-P-9750MSA 
4 Remove rear noise insulation.    
5.1 Remove charge air line. Engine 256.9 in model 257
except code M016 (Uprated engine)
 
      AR09.41-P-8950MSA
5.2 Remove the check valve. Engine 256.9 in model 213, 238, 257, 290 with code M016 (Uprated engine)  
      AR09.41-P-8970MSA
6 Remove screws (2) and place vacuum line to one side. TORQUE SPECIFICATION Screw, vacuum line bracket to chain case cover on cylinder head *BA01.30-P-1003-01MRT 
7 Remove screw (3) and place bracket to one side. TORQUE SPECIFICATION Bolt, holder for high-pressure line to camshaft housing/cylinder head *BA07.03-P-1004-01MRT 
8 Release and disconnect the electrical connections (4).    
9 Unclip electric line (5) from rear cap (1) and place to one side.    
10 Remove screws (6) in reverse order of the tightening procedure. Bolt plan for rear cover on cylinder head AR01.30-P-5702-05MRT 
    TORQUE SPECIFICATION Screw, chain case cover to cylinder head/camshaft housing *BA01.30-P-1001-01MRT 
11 Remove rear cap (1). NOTES
Do not pound in a tool between the rear cap (1) and cylinder head to remove.
Sealing surfaces will otherwise be damaged.
INSTALLATION IMPORTANT Replace seal.
 
12 Remove the solenoid for the exhaust camshaft. When installing new rear cap (1).  
      AR05.20-P-7306MSA
13 Remove the solenoid for the intake camshaft. When installing new rear cap (1).  
      AR05.20-P-7305MSA
CLEAN Clean     
14 Clean sealing surfaces of the rear cap (1) and cylinder head. NOTES
Do not use any sharp-edged tools or abrasive paper.
Sealing surfaces will otherwise be damaged.
 
    Loctite 7063 (400 ml) cleaning spray *BR00.45-Z-1046-04A 
    Loctite 7200 *BR00.45-Z-1038-04A 
INSPECT Check     
15 Check sealing surfaces of the rear cap (1) and cylinder head for damage. If damage is present,

Replace corresponding component.
 
      AR01.30-P-5800MSA 
16 Install in the reverse order.    
17 Check engine oil level and correct.    
REFER TO MAINTENANCE   Engine 256.9 in model 213, 238, 290 AP18.00-P-1812MKI
REFER TO MAINTENANCE   Engine 256.9 in model 257 AP18.00-P-1812BKI
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
18 Carry out engine test run and check engine for proper leaktightness and leaktightness.    
19 Install upper engine cover.   AR01.10-P-2405MSA 
CYLINDER HEAD

Number Designation Engine 256.9
BA01.30-P-1001-01MRT Screw, chain case cover to cylinder head/camshaft housing Nm 8
CYLINDER HEAD

Number Designation Engine 256.9
BA01.30-P-1003-01MRT Screw, vacuum line bracket to chain case cover on cylinder head Nm 8
HIGH-PRESSURE LINE, LOW-PRESSURE LINE, FUEL DISTRIBUTOR

Number Designation Engine 256.9
BA07.03-P-1004-01MRT Bolt, holder for high-pressure line to camshaft housing/cylinder head Nm 8
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1038-04A Loctite 7200 A 010 989 90 71
BR00.45-Z-1046-04A Loctite 7063 (400 ml) cleaning spray A 001 986 71 71 09