Maintenance
3425−1/A1
Winterthur Gas & Diesel Ltd.
7/ 9
3.3.2 Alternative Procedure with Piston Ring Piece
1) Measure the thickness of the piece of piston ring (1, Fig. 6).
2
94122
X1
1
WCH02244
Fig. 6
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
piston ring and the groove.
Note: You must measure the height of the groove 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
Where:
D C = Clearance (mm)
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 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.
2016
Piston Rings and Grooves − Rate of Wear Three Piston Rings
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