Maintenance3425−1/A1
Winterthur Gas & Diesel Ltd.
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2. Piston Ring − Rate of Wear
2.1 Chrome-ceramic Layer − Measure (Piston Installed)
WARNING
Injury Hazard: Before you operate the turning gear, make sure that
no personnel are near the flywheel, or in the engine.
1) Read the data in the suppler documentation for the Permascope MP0 (94356).
2) Calibrate the Permascope MP0 (94356). Use the calibration foils and the top
flank of a spare top piston ring to get a correct setting.
3) Operate the turning gear to move the piston almost to BDC (so that you can see
the piston rings).
4) Clean the surface of the piston ring (1, Fig. 1) at the locations P1 to P9.
5) Put the sensor of the Permascope MP0 (94356) against the middle of the piston
ring (1).
6) Record the value on the digital display of the Permascope MP0 (94356).
7) Compare the measured data with the limits given in 0330−1, Clearance Table,
Piston and Piston Rings. If the recorded data is not in the limits given, you must
do an overhaul of the piston head.
WCH01216
94356
1
Minimum
Recommended
Locations to Measure the Thickness of the
Chrome-ceramic Layer on the Piston Ring
P3
P5
P7
P1P9
P5
P1P9
Fig. 1
2016
Piston Rings and Grooves − Rate of Wear Three Piston Rings
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