Maintenance
3425
−
1/A1
Winterthur Gas & Diesel Ltd.
3.
Piston Ring Grooves
Do a check of all dimensions and record them, refer to 0330
−
. 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 inside the
engine.
1) Operate the turning gear to move the
piston (2,
Note: Push the feeler gauge fully into the
piston ring groove. This will make
sure that the feeler gage will touch
the inner diameter of the groove.
2) Measure the clearance X1 at Point A. If
there is a wear step on the
chrome-ceramic layer, you can push the
feeler gage only to that point.
3) Measure the clearance at X2.
4) Do step
) 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
−
.
5) If the clearance at point A is more than
) and step
a) Replace the piston rings.
b) Repair the piston head.
Note: For the repair of piston
crowns, speak to the nearest
Wärtsilä Service Center.
Piston: Wear of Piston Rings and Ring Grooves
2016
2
94122
1
WCH02244
Fig. 3
1
2
Wear Step On
Chrome-ceramic Layer
2
1
X2
2
1
Possible Wear
Shape On Piston
Groove
X2
X1
A
X1
Содержание X40-B
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