Remove/install piston rings · ar0310b7311a · Mercedes-Benz WIS

AR03.10-B-7311A

Remove/install piston rings

12.02.16

Cumbustion engine 372.9 with Vehicle 341, 382, 384, 386, 390, 394, 682

Cumbustion engine 374.9 with Vehicle 685, 688.1, 693

Cumbustion engine 376.9 with Vehicle 364, 382, 384, 386, 682

Cumbustion engine 376.9 with Vehicle 397.3## #B

Cumbustion engine 377.9 with Vehicle 382, 384, 685, 693, 694, 695

Cumbustion engine 386.9 with Vehicle 684.### #A, 684.### #B, 684.### #D

Cumbustion engine 386.9 with Vehicle 685.4

W03.10-0032-06

1-3 Piston rings

1 groove I ring

2 groove II ring

3 groove III ring

3.1 Tubular spring

4 Piston

5 Ring pliers

6 Feeler gauge

	Remove and install
1	Remove the piston (4)		AR03.10-B-7021A
2	Remove from the piston (4), the rings in the order, (1), (2) and (3)	 Adjust the pliers (5) with the screw, limiting ring opening to a diameter slightly above piston outside diameter.
			*000589373700
	Check:
3	Check the pistons for damage and/or wear in the ring grooves	In case of reutilization, remove carefully the incrusted charcoal residues in the grooves and on the piston upper part. Replace the piston that shows ring groove damage and/or wear.
4	Check the piston rings for damage and/or wear	Replace rings that show lateral wear, cracks and/or material loosening from surface layer. Installing: The marking ‘TOP’ on the piston rings will have to be directed to the piston crown.
	Measure
5	Measure the ring gap (1) and (2)	Insert and seat perfectly the ring, in the area of the cylinder which is not worn (above the upper point of inversion of the 1st ring movement).	*BE03.10-B-1002-05E
		Universal Feeler Gauge from 0.05 to 1 mm
6	Measure the ring gap (3)	Remove the tubular spring (3.1) from oil control ring (3). Insert and seat perfectly the ring, in the area of the cylinder which is not worn (above the upper point of inversion of the 1st ring movement).
			*BE03.10-B-1002-05E
		Universal Feeler Gauge from 0.05 to 1 mm
		Installing: Install tubular spring (3.1) into oil control ring (3). Position opening (ends) of tubular spring (3.1), offset by 180o from opening (ends) of oil control ring (3).
7	Install in the reverse order
8	Check the rings side clearance in the grooves		*BE03.10-B-1003-05E

Check values for piston rings

Número	Denominação				Engine 372.9; 374.9; 376.9 (except gas engine); 377.9; 386.9


BE03.10-B-1002-05E	Piston ring ends clearance	Groove I ring	new	mm	0,20...0,35
			Wear limit	mm	1,1
			Wear limit for turbo engine	mm	1,4
		Groove II ring	new	mm	0,20...0,35
			Wear limit	mm	0,9
		Groove III ring	new	mm	0,25...0,40
			Wear limit	mm	0,8
BE03.10-B-1003-05E	Groove's clearance	Groove II compression ring		mm	0,060...0,095
		Groove III oil scrapper ring		mm	0,030...0,065

000 589 37 37 00

Ring pliers

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