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Remove/install piston rings - AR03.10-P-7311MM

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ENGINE 157, 278 in MODEL 216, 221, 222, 231 

Fig 1: Identifying Piston Remove/Install Components
G10108149Courtesy of MERCEDES-BENZ USA
REMOVING Remove     
1 Remove piston (5)   AR03.10-P-7021MM 
2 Take off plain compression ring (6c) with piston ring pliers SPECIAL TOOL Pliers Fig 2
3 Take off taper-faced hook scraper ring (6b) with piston ring pliers SPECIAL TOOL Pliers Fig 2
4 Remove oil scraper ring (6) by hand    
INSTALLING Install     
5 Mount oil scraper ring (6a) by hand    
6 Install taper-faced hook scraper ring (6b) with piston ring pliers IMPORTANT Note installation position of taper-faced hook scraper ring (6b). The "Top" marking or manufacturer's designation must face towards the piston crown (5a).  
SPECIAL TOOL Pliers Fig 2
7 Install plain compression ring (6c) with piston ring pliers IMPORTANT Note installation position of plain compression ring (6b). The "Top" marking or manufacturer's designation must face towards the piston crown (5a).  
SPECIAL TOOL Pliers Fig 2
8 Offset piston ring end gaps for piston ring (6a, 6b, c) by 120° degrees respectively on the circumference of the piston (5)    
9 Install piston (5)   AR03.10-P-7021MM 
Fig 2: Identifying Pliers (000 589 51 37 00)
G07764343Courtesy of MERCEDES-BENZ USA