
Maintenance
3425
−
1/A1
Winterthur Gas & Diesel Ltd.
3.3.2 Alternative Procedure with Piston Ring Piece
1) Measure the thickness of the piece of piston ring (1,
2
94122
1
WCH02244
Fig. 6
X1
2) Put the piece of piston ring (1) into the piston ring groove.
3) Use the feeler gage (94122) to measure the clearance X1 between the face of
the piston ring and the groove.
Note: You must measure the groove height at a minimum of four locations
around the circumference of the piston head (2).
4) Use the data that follow to calculate the piston ring clearance:
C = GH
−
RT (mm)
Where:
D
C = Clearance
D
GH = the measured height of the piston ring groove (mm)
D
RT = the nominal piston ring thickness (mm).
Note: If the clearance at X1 is more than the permitted value, you must repair
the piston head. For the maximum wear values, 0330
−
1,
. For the repair of piston heads, speak to the nearest Wärtsilä
Service Center.
Do not install a piston head that has clearances near the maximum value. This is
because the service life will be too short.
Piston: Wear of Piston Rings and Ring Grooves
2017
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Страница 546: ...Woodward L Orange GmbH Porschestraße 8 D 70435 Stuttgart Tel 49 711 82609 0 Fax 49 711 82609 61 www lorange com ...