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Remove/Install Tensioning Rails On Secondary Chain Drive - AR05.10-P-8129MNA

Engine 176 in model 463 up to model year 2019 

Engine 177 in model 205 

Shown on ENGINE 177 

Fig 1: Tensioning Rails On Secondary Chain Drive Components Location - Engine 176 In Model 463 Up To Model Year 2019 (Shown On Engine 177)
G13655601Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Remove camshaft positioner for right intake camshaft To remove the tensioning rail (1).  
      AR05.20-P-7204MNA 
2 Remove camshaft positioner for left exhaust camshaft To remove the tensioning rail (3).  
      AR05.20-P-7204MNA 
3 Remove tensioning rail bolt (2) To remove the tensioning rail (1).  
    SPECIAL TOOL Threaded bolt Fig 2
    SPECIAL TOOL Impact extractor Fig 3
4 Remove tensioning rail bolt (4) To remove the tensioning rail (3).  
    SPECIAL TOOL Threaded bolt Fig 2
    SPECIAL TOOL Impact extractor Fig 3
5 Remove tensioning rail (1) or tensioning rail (3) upwards    
6 Check tensioning rail (1) and tensioning rail (3) for wear, galling and damage and replace tensioning rail (1) and tensioning rail (3) if necessary    
7 Install in the reverse order    
INSPECT Check     
8 Check engine oil level; correct if necessary    
REFER TO MAINTENANCE   Engine 176 in model 463 up to model year 2019 AP18.00-P-0101GE
REFER TO MAINTENANCE   Engine 177 in model 205 AP18.00-P-0101D
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
9 Carry out engine test run and check engine for leaktightness while it is running    
Fig 2: Identifying Threaded Bolt (102 589 00 34 00)
G13655602Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Impact Extractor (116 589 20 33 00)
G13655603Courtesy of MERCEDES-BENZ USA