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Check timing chain - AR05.10-P-7600A

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ENGINE 651 in MODEL 117, 156, 166, 172, 176, 204, 205, 207, 212, 218, 221, 222, 246 

REMOVINGINSTALLING Remove/install     
1 Remove chain tensioner MODEL 222 with ENGINE 651 AR05.10-P-7800OLF
    MODEL 205 with ENGINE 651 AR05.10-P-7800OLD
    MODEL 166, 172, 204, 207, 212, 218, 221 with ENGINE 651 AR05.10-P-7800CD 
    MODEL 117, 156, 176, 246 with ENGINE 651
INSTALLATION IMPORTANT Replace sealing ring.
AR05.10-P-7800OLB
2 Install measuring chain tensioner IMPORTANT The SPECIAL TOOL measuring chain tensioner is installed without a sealing ring.  
    TORQUE SPECIFICATION Measuring chain tensioner to cylinder head *BA05.10-P-1005-01Q 
    SPECIAL TOOL Measuring chain tensioner Fig 1
INSPECT Check     
3 Rotate engine twice at crankshaft twice in direction of engine rotation and determine the greatest indicator value on the measuring chain tensioner. IMPORTANT This is generally found at ignition TDC for cylinder 1.  
    Change timing chain after timing chain stretch *BE05.10-P-1001-03B 
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 CHECK VALUES

Number Designation ENGINE 651 in MODEL 117, 156, 166, 172, 176, 204, 205, 207, 212, 218, 221, 222, 246
BE05.10-P-1001-03B Change timing chain after timing chain stretch Up to 250, 000 km mm > 82
Over 250, 000 km mm > 84
TIMING CHAIN, CHAIN TENSIONER

Number Designation ENGINE 651
BA05.10-P-1005-01Q Measuring chain tensioner to cylinder head Nm 20
Fig 1: Identifying Chain Tensioner Measuring Tool (651 589 11 63 00)
G09974225Courtesy of MERCEDES-BENZ USA