Remove/install piston rings

AR03.10-T-7311BB

20.11.06

ENGINE 457.941 in model NMB613.368

ENGINE 457.942 in MODEL NMB671.015 /020 /021 /030 /042 /332 /333

ENGINE 457.944 in MODEL NMB613.358 /367 /388

W03.10-0027-06

1 Keystone ring

2 Taper-faced ring (with an internal angle)

3 Bevel-edged ring (with a spring expander)

3.1 Coil spring

4 Pistons

5  Pliers

6  Feeler gage

	Removing
1	Remove piston (4)	For model 613.358/388, model 671	AR03.10-T-7021BB
		For model 613.367/368	AR03.10-T-7021CB
2	Remove keystone ring (1), taper faced ring (2) and double beveled slotted oil control ring (3)	 Adjust pliers to piston diameter and remove piston rings in the specified order with the piston ring pliers.
			*000589373700
3	Remove coil spring (3.1) from the double beveled slotted oil control ring (3)
 	Check, measure
4	Remove combustion residues from piston rings
5	Check piston rings for chippings in the non-metallic coating and for cracks	 Replace damaged rings if any.
6	Measure piston ring end clearance	 If the measured value does not match the given valve, replace the relevant piston ring.	AR03.10-T-7311-02A
			*BE03.10-N-1001-05H
		Feeler gauge
	Install
7	Install spring expander (3.1) in the bevel-edged ring (3)	 The joint on the spring expander must be offset at 180° to the joint of the piston ring .
8	Install bevel-edged ring (3), the taper-faced ring (2) and the keystone ring (1)	 The marking 'TOP' must point toward piston crown. Arrange the joints of the piston rings uniformly so that they offset each other.
			*000589373700
 	Check, measure
9	Measure end clearance of piston rings	 If the side clearance is too large, replace pistons and piston rings together.	AR03.10-T-7311-01A
			*BE03.10-N-1002-05H
		Feeler gauge
10	Check piston rings once again for chippings in the non-metallic coating and for cracks
	Install
11	Install piston (4)	For model 613.358/388, model 671	AR03.10-T-7021BB
		For model 613.367/368	AR03.10-T-7021CB

Check values for piston rings

Number	Designation				Engine 457.941/942	Engine 457.944


BE03.10-N-1001-05H	Piston ring end clearance	Groove I	when new	mm	0.60 to 0.75	0.60 to 0.75
		Keystone ring	Wear limit	mm	1.0	1.0
		Groove II	when new	mm	0.60 to 0.75	0.60 to 0.75
		Taper-faced ring with internal angle	Wear limit	mm	1.0	1.0
		Groove III	when new	mm	0.40...0.55	0.40...0.55
		Bevel-edge ring with garter spring	Wear limit	mm	1.0	1.0
BE03.10-N-1002-05H	Piston ring vertical clearance		Taper-faced ring	mm	0.07 to 0.105	0.07 to 0.105
			Bevel-edge ring with garter spring	mm	0.03 to 0.065	0.03 to 0.065
			Keystone ring	mm	0.047 to 0.102	0.047 to 0.102

Pliers

000 589 37 37 00

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