Removing/installing piston rings - AR03.10-P-7311HA

ENGINE 604, 605, 606 

Fig 1: Identifying Piston Ring Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Measuring Piston Ring Side Clearance

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Measuring Piston Rings Gap Clearance

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Illustration of item, etc	Work instructions
	Pistons	cover	AR03.10-P-7021B
1, 2, 3	Piston rings	cover Installation:  Note installation position! "Top" or manufacturer's designation points toward piston crown. Insert hooked spring with oil scraper ring offset by 180° to the joint (arrow). Install piston rings (1, 2, 3) with piston ring gaps offset 120°.
			Figure
		Piston ring vertical clearance	*BE03.10-P-1003-02B
		Piston ring end gap	*BE03.10-P-1004-02B
			*WH58.30-Z-1004-12A

Test values for pistons

Number	Designation			Engine 604.915/917	Engines 605.91/96
BE03.10-P-1003-02B	Piston ring vertical clearance	Groove 1	mm	≤0.20	≤0.20
		groove 2	mm	≤0.15	≤0.15
		Groove 3	mm	≤0.10	≤0.10
BE03.10-P-1004-02B	Piston ring end gap	Groove 1	mm	≤1.0	≤1.0
		groove 2	mm	≤1.0	≤1.0
		Groove 3	mm	≤1.0	≤1.0

Test values for pistons

Number	Designation			Engine 606.91/96
BE03.10-P-1003-02B	Piston ring vertical clearance	Groove 1	mm	≤0.20
		groove 2	mm	≤0.15
		Groove 3	mm	≤0.10
BE03.10-P-1004-02B	Piston ring end gap	Groove 1	mm	≤1.0
		groove 2	mm	≤1.0
		Groove 3	mm	≤1.0

Fig 4: Identifying Pliers (000 589 51 37 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Commercially available tools

Number	Designation
WH58.30-Z-1004-12A	Feeler gauge