Removing/installing from piston rings

AR03.10-P-7311FG

8.9.04

ENGINE 639.939 in MODEL 454.0

P03.10-2090-06

1 Plain compression ring

2 Taper-faced hook scraper ring

3 Oil scraper ring

4 Coil spring

5 Pistons

6  Pliers

	Removing
1	Remove piston (5)		AR03.10-P-7021FG
2	Insert the plain compression ring (1), the taper-faced hook scraper ring (2) and the oil scraper rings (3) into the piston (5) using pliers (6)		*450589143700
3	Remove spring expander (4) by hand
4	Measure plain compression ring (1), taper-faced hook scraper ring (2) and oil scraper ring (3) using a suitable measuring instrument		*BE03.10-P-1003-05G
5	Measure end gap of plain compression ring (1), the taper-faced hook scraper ring (2) and the oil scraper ring (3) using a suitable feeler gauge	 In case of wear: Replace plain compression ring (1), taper-faced hook scraper ring (2) and oil scraper ring (3).	AR03.10-P-7311-02FF
			*BE03.10-P-1002-05G
6	Clean piston (5) and check for damage
	Installing
7	Insert spring expander (4) by hand in the groove on the piston (5)
8	Insert oil scraper ring (3) using pliers (6) into the lowest groove on the piston (5)	Note the installation position. The marking 'Top' must point to the piston crown. Insert spring expander (4) in oil scraper ring (3) offset by 180° (arrow A) to the joint.
			*450589143700
9	Insert plain compression ring (1) and taper-faced hook scraper ring (2) using pliers (6) into the appropriate groove on the piston (5)	Note the installation position. The marking 'Top' must point to the piston crown. Insert the joints on the plain compression ring (1), the taper-faced hook scraper ring (2) and the oil scraper ring (3) offset by 120°
			*450589143700
10	Measure side clearance of plain compression ring (1), the taper-faced hook scraper ring (2) and the oil scraper ring (3) using a suitable feeler gauge		AR03.10-P-7311-01FG
			*BE03.10-P-1001-05G
11	Install piston (5)		AR03.10-P-7021FG

Inspection data of piston rings

Number	Designation			Engine 639.939


BE03.10-P-1001-05G	Piston ring end clearance	Groove 1	mm	0.13...0.17
		Groove 2	mm	0.08...0.35
		Groove 3	mm	0.03...0.07
BE03.10-P-1002-05G	Piston ring end gap	Groove 1	mm	0.2...0.35
		Groove 2	mm	0.4...0.6
		Groove 3	mm	0.2...0.4
BE03.10-P-1003-05G	Dimension	Plain compression ring	mm	83.0 x 2.0 x 3.40
		Taper-faced hook scraper ring	mm	83.0 x 2.0 x 3.45
		Oil scraper ring	mm	83.0 x 2.0 x 3.40

Pliers

450 589 14 37 00

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