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Replace timing chain - AR05.10-P-7601GZA (ML350, ML550, GL450, GL550): Notes

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ENGINE 272, 273 in MODEL 164, 251 

Fig 1: Identifying Timing Chain, Exhaust Camshaft, Intake Camshaft And Pulse Wheel Marking
G05257370Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 2: Identifying Marking On Camshaft Adjuster
G05257371Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
REMOVING Removing    
DANGER Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries No fire, sparks, open flames or smoking.
Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.		 AS54.10-Z-0001-01A
1 Disconnect ground line from battery Model 164 AR54.10-P-0003GZ
    Model 251 AR54.10-P-0003RT
NOTES Notes on battery   AH54.10-P-0001-01A
2 Remove ignition coils   AR15.12-P-2003GZA
3 Remove spark plugs IMPORTANT To ensure that engine can be cranked easily when drawing in the timing chain.  
4 Remove exhaust camshaft (1) and intake camshaft (2) at right cylinder head   AR05.20-P-6992GZA 
5 Disconnect old timing chain (3) IMPORTANT Before commencing work on the timing case recess, cover over recess with clean cloth to prevent small parts dropping down.
Parts which have fallen into the timing case recess, must be removed.		 AR05.10-P-7601-01VA 
    SPECIAL TOOL Figure
    SPECIAL TOOL Figure
    SPECIAL TOOL Figure
INSTALLING Install     
6 Draw in new timing chain (4) IMPORTANT Always remove the assembly link after drawing in the new timing chain. These are only an assembly aid and not intended for engine running. AR05.10-P-7601-04VA 
    SPECIAL TOOL Figure
    SPECIAL TOOL Figure
7 Rivet new timing chain (4) IMPORTANT Before commencing work on the timing case recess, cover over recess with clean cloth to prevent small parts dropping down.
Parts which have fallen into the timing case recess, must be removed.		 AR05.10-P-7601-02VA 
    TORQUE SPECIFICATION *BA05.10-P-1007-01B 
    SPECIAL TOOL Figure
    SPECIAL TOOL Figure
    SPECIAL TOOL Figure
    SPECIAL TOOL Figure
    SPECIAL TOOL Figure
8 Turn engine at crankshaft in direction of engine rotation to a 55° crank angle before ignition TDC of first cylinder (the 305° marking on the belt pulley) IMPORTANT Markings (5) on the exhaust and intake camshaft pulse wheel on the left cylinder head must stand in the middle in the camshaft Hall sensor bores: ↓  
    Check basic position of camshafts for an installed front cover on cylinder head at a 55° crank angle before ignition TDC.
IMPORTANT If markings (5) on the exhaust and intake camshaft pulse wheel on the left cylinder head cannot be seen through the camshaft Hall sensor bores, turn engine at crankshaft by one turn in direction of engine rotation.		 AR05.20-P-6010GZA 
9 Turn engine at crankshaft in direction of engine rotation through a 95° crank angle to a 40° crank angle after ignition TDC on the first cylinder    
10 Install exhaust and intake camshaft on right cylinder head in basic position IMPORTANT Markings on the camshaft adjuster (6) are aligned to the top and the markings on the camshaft adjuster (7) are in alignment with the cylinder head cover contact surface: AR05.20-P-6992GZA 
↓
    Check basic position of camshafts for an uninstalled front cover on cylinder head at a 40° crank angle before ignition TDC. AR05.20-P-6010-01VB 
11 Turn engine at the crankshaft in the direction of rotation of the engine and check basic position of camshafts for an installed front cover on cylinder head at a 55° crank angle before ignition TDC (305° marking on the belt pulley) IMPORTANT The markings (5) on the pulse wheels for the exhaust and intake camshaft must lie in the middle in the camshaft Hall sensor bores. AR05.20-P-6010GZA 
12 Install spark plugs TORQUE SPECIFICATION *BA15.10-P-1001-01C 
13 Install ignition coils   AR15.12-P-2003GZA
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
14 Carry out an engine test run and check the engine for leaks    
TIMING CHAIN, CHAIN TENSIONER

Number Designation Engine 272 Engine 273
BA05.10-P-1007-01B Bolt for timing chain rivet element (reference value) Nm 32 32
SPARK PLUGS

Number Designation Engine 272 Engine 273
BA15.10-P-1001-01C Spark plug on cylinder head Nm 23 23
Fig 3: Identifying Case (602 589 00 98 00)
G05257372Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 4: Identifying Chain Separating Tool (602 589 02 33 00)
G05257373Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 5: Identifying Thrust Spindle (602 589 05 63 00)
G05257374Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 6: Identifying Assembly Inserts (271 589 01 63 00)
G05257375Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 7: Identifying Assembly Link (272 589 03 63 00)
G05257376Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 8: Identifying Riveting Tool (272 589 00 39 00)
G05257377Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 9: Identifying Assembly Inserts (272 589 00 63 00)
G05257378Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 10: Identifying Guide (272 589 01 63 00)
G05257379Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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