Remove/install piston rings - AR03.10-P-7311AMG: Notes

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ENGINE 156

Fig 1: Identifying Piston Rings Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing
1	Remove pistons		AR03.10-P-7021AMG
2	Using pliers, remove compression rings from piston (4)	Pliers	Fig 2
3	Remove oil scraper ring (3) from piston (4)	The oil scraper ring is in three parts and must be removed by hand.
	Install
4	Measure ring width of compression rings		*BE03.10-P-1003-05D
5	Measure end gap of compression rings		AR03.10-P-7311-02AMG *BE03.10-P-1002-05D
		Feeler gauge
6	Using pliers, insert compression rings into piston (4)	Pay attention to installation position of compression rings. The "Top" marking or manufacturer's designation must face towards piston crown (5).
		Pliers	Fig 2
7	Measure side clearance of compression rings		AR03.10-P-7311-01AMG *BE03.10-P-1001-05D
		Feeler gauge
8	Fit the oil scraper ring (3) by hand
9	Install pistons	The piston ring gaps must be offset by 120°. AR03.10-P-7021AMG

CHECK VALUES FOR PISTON RINGS

Number	Designation			Engine 156
BE03.10-P-1001-05D	Piston ring vertical clearance	Groove 1	mm	0.02 to 0.065
		Groove 2	mm	0.015 to 0.045
		Groove 3	mm	0.01 to 0.013
BE03.10-P-1002-05D	Piston ring end gap	Groove 1	mm	0.2 to 0.35
		Groove 2	mm	0.35...0.55
		Groove 3	mm	0.2 to 0.7
BE03.10-P-1003-05D	Dimension	Plain compression ring	mm	102.2 x 1.2 x 3.45
		Taper-faced hook scraper ring	mm	102.2 x 1.75 x 3.9
		Oil scraper ring	mm	102.2 x 2.0 x 2.7

Fig 2: Identifying Pliers (000 589 51 37 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.