Maintenance
3425−1/A1
Winterthur Gas & Diesel Ltd.
7/ 9
2.3.2 Alternative Procedure with Piston Ring Piece
1) Measure the thickness of the piece of piston ring (1, Fig. 5).
2
94122
X1
1
WCH02244
Fig. 5
2) Put the piece of piston ring (1) into the piston ring groove.
3) Use the feeler gauge (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 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 permitted values, refer to 0330−1,
Piston and Piston Rings. 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 Rings: Wear of Piston Rings and Ring Grooves
2015
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