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Remove/install chain tensioner - AR05.10-P-7800SXI

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ENGINE 642 in MODEL 207, 212, 218, 221, 222 

Shown on engine 642.9 

Fig 1: Chain Tensioner Remove/Install Components - Shown On Engine 642.9
G09974296Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Remove engine cover ENGINE 642 in MODEL 207, 212, 218, 221, 222  
    ENGINE 642 in MODEL 221
INSTALLATION IMPORTANT Ensure correct seating of the engine cover.
AR01.10-P-2405SXI
2 Remove right air filter housing   AR09.10-P-1150SXI
3 Remove chain tensioner (1) INSTALLATION IMPORTANT Replace sealing ring.  
    TORQUE SPECIFICATION Chain tensioner in cylinder head *BA05.10-P-1001-01L 
4 Install in the reverse order    
DANGER 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
5 Check for oil leaks with engine running    
TIMING CHAIN, CHAIN TENSIONER

Number Designation ENGINE 642
BA05.10-P-1001-01L Chain tensioner in cylinder head Nm 80