Maintenance3425−1/A1
Winterthur Gas & Diesel Ltd.
2/ 9
2. Piston Rings − Rate of Wear
2.1 Chrome-Ceramic Layer − 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 tool 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) Use 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.
94356
1
P3
P5
P7
P1P9
P5
P1P9
Fig. 1
WCH01216
Locations to Measure the Thickness of the
Chrome-ceramic Layer on the Piston Ring
Minimum
Recommended
Piston Rings: Wear of Piston Rings and Ring Grooves
2015
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