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Remove/install left cylinder head cover - AR01.20-P-5013EL

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ENGINE 272, 273 (except 272.983) in MODEL 212 

Fig 1: Left Cylinder Head Cover Remove/Install Components
G09973777Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
DANGER Risk of death  caused by vehicle slipping or toppling off the lifting platform. Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer. AS00.00-Z-0010-01A
1 Turn key in ignition lock to position "0"    
2 Remove bottom engine compartment paneling   AR61.20-P-1105EW
3 Drain coolant at radiator   AR20.00-P-1142EWS
NOTES Notes on coolant   AH20.00-N-2080-01A
4 Remove air filter housing   AR09.10-P-1150EWS
5 Remove poly-V belt and poly-V belt tensioning device   AR13.20-P-0001EWS
6 Remove coolant thermostat   AR20.10-P-2460EW
7 Remove oil filter housing (1)   AR18.20-P-3471EW
8 Remove expansion reservoir (2)   AR46.25-P-1000EWL
9 Remove front cover (3) at left cylinder head   AR01.30-P-5700EWL 
10 Detach the purge line (4) at separation point (arrow), unclip it from brackets on oil separator (5) and feed line duct (6) and place it to the side    
11 Reduce fuel pressure at service valve   AR07.03-P-1460-01VA
    TORQUE SPECIFICATION Engine 272 *BA07.03-P-1004-01B 
    SPECIAL TOOL Fig 2
12 Detach fuel line (7) at fuel distributor (8) IMPORTANT Catch escaping fuel with an absorbent rag!
IMPORTANT Seal connections immediately with stop plugs.
 
    TORQUE SPECIFICATION *BA07.03-P-1001-01B 
    SPECIAL TOOL Fig 3
13 Remove ignition coils on left cylinder head   AR15.12-P-2003EW
14 Remove oil separator (5)   AR01.20-P-9750EWS 
15 Detach ground line (9) from cylinder head cover (10) TORQUE SPECIFICATION *BA01.30-P-1001-01O 
16 Remove left rear engine lifting eye (11) TORQUE SPECIFICATION *BA01.30-P-1005-01O 
    TORQUE SPECIFICATION *BA15.18-P-1003-01B 
17 Remove feed line duct (6) from cylinder head cover (10) TORQUE SPECIFICATION *BA15.18-P-1002-01B 
18 Detach front rubber mount (12) for air filter housing from cylinder head cover (10) TORQUE SPECIFICATION *BA01.30-P-1011-01O 
19 Remove heat shield (10a) TORQUE SPECIFICATION *BA01.30-P-1017-01O 
20 Remove vacuum pump Engine 272 AR43.05-P-1320ED
21 Loosen bolts for cylinder head cover (10) 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 
22 Pry off cylinder head cover (10) from cylinder head carefully NOTES To avoid damaging sealing surfaces, do not pound in the prying tool between the cylinder head cover (10) and the cylinder head.
INSTALLATION IMPORTANT Apply sealant to cylinder head cover (10)
 
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 Figure
    Loctite sealant 5970 *BR00.45-Z-1013-01A 
CLEANING Clean     
23 Clean sealing surfaces at cylinder head and at cylinder head cover (10) 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 
24 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
25 Conduct engine test run and check engine for leaks    
INJECTORS, INJECTION VALVES, LINES

Number Designation Engine 272 Engine 273
BA07.03-P-1001-01B Union nut, fuel line to fuel distributor Nm 20 20
BA07.03-P-1004-01B Protective cap on service valve Plastic Nm 2 -
Metal Nm 15 -
CYLINDER HEAD

Number Designation Engine 272 Engine 273
BA01.30-P-1001-01O Bolt, ground line to front cover M6 Nm 9 9
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-1005-01O Bolt, lifting eye to cylinder head M8 Nm 20 20
BA01.30-P-1011-01O Bolt, air filter housing rubber mount to cylinder head cover M6 Nm 9 9
BA01.30-P-1017-01O Bolt, heat shield to cylinder head M6 Nm 9 9
ENGINE WIRING HARNESS

Number Designation Engine 272 Engine 273
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 Pressure Hose (119 589 04 63 00)
G09973778Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Set Of Stop Plugs (129 589 00 91 00)
G09973779Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Squeeze Gun (112 589 00 25 00)
G09973780Courtesy 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