Maintenance
3425−1/A1
Winterthur Gas & Diesel Ltd.
5/ 9
3. Piston Ring Grooves
Do a check of all dimensions and record them (see 0330−1 Piston and Piston Rings).
These records are important for an analysis of the running gear and must include the
data that follow:
D All dimensions
D The date of the overhaul
D The operation hours of the different components
D The operation hours of the engine.
3.1 Piston Ring Clearance
(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) Operate the turning gear to move the
piston (2, Fig. 3) down.
Note: Push the feeler gauge fully into the
groove in the piston head. This will
make sure that the feeler gauge
will touch the inner diameter of the
groove.
2) Measure the clearance X1 at Point A. If
there is unwanted material on the
chrome-ceramic layer, you can push
the feeler gauge only to that point.
3) Measure the clearance at X2.
4) Do step 2) and step 3) above at
between two and four different
locations around the piston (2).
The sum of each value from X1and X2 will
give the total piston ring clearance.
The maximum clearance is at point A. For
the maximum wear data, refer to 0330−1,
Piston and Piston Rings.
5) If the clearance at point A is more than
the permitted value, do step a) and
step b)
a) Replace the piston rings.
b) Repair the piston head.
Note: For the repair of piston heads,
speak to the nearest Wärtsilä
Service Center.
2016
Piston Rings and Grooves − Rate of Wear Three Piston Rings
2
94122
1
WCH02244
Fig. 3
1
2
Unwanted Material On
Chrome-ceramic Layer
2
1
X2
2
1
Possible Shape
On Piston Groove
X2
X1
A
X1
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