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Remove, install tensioning rail - AR05.10-P-8127MCU

ENGINE 132.910 in MODEL 451.3/4 

Fig 1: Identifying Tensioning Rail Remove/Install Components
G10978057Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Remove timing case cover   AR01.40-P-8000MCU
2 Mark position of timing chain (2) relative to intake and exhaust camshaft and crankshaft. Mark position of intake and exhaust camshaft relative to cylinder head INSTALLATION IMPORTANT : Check markings and correct settings if necessary.  
3 Push back ratchet (5) using a suitable screwdriver, press together chain tensioner (3) and secure using a pin with a diameter of 1.5 mm via the bore (arrow)    
4 Unscrew bolt (4) TORQUE SPECIFICATION *BA05.10-P-1001-01P 
5 Pull out tensioning rail (1) between timing chain (2) and chain tensioner (3)    
6 Install in the reverse order    
TIMING CHAIN DRIVE

Number Designation ENGINE 132.9
BA05.10-P-1001-01P Bolt, timing chain tensioning rail to cylinder head Nm 23