Maintenance3425−1/A1 RT-flex50-D
Wärtsilä Switzerland Ltd
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4. Fitting piston rings
D When reusing piston rings, only rings in perfect condition may be fitted, how-
ever in the same position and groove as removed.
⇒ The edges of the ring gap must be rounded off with a radius of 0.5 mm (with
exception of CC coated piston ring).
⇒ Reused piston rings with sharp edges must be rounded off with radii as shown
in the figure below (with exception of CC coated piston ring).
D Always fit piston ring with the marking TOP upwards
(when the piston is assembled the piston rings must be turned such that the
ring gaps are staggered by 180_).
D The chromium plating thickness of a new CC coated piston ring should be
measured and recorded to monitor the wear rate over time.
Remark: New piston rings have to be run-in according to the indications in the
Operating Manual 0410−1.
Ring type Coating / material Application
Uppermost piston ring ’a’
1 x GTP1CC15_Gas Tight chrome-ceramic
coated
for new and fully
honed cylinder liner
as well as for used
cylinder liners in
good conditions
Piston rings ’b’ and ’c’
2 x SCP1RC15_Straight Cut
running-in coating
C
a
b
c
003.831/96
r 2
TOP
TOP
r 2
r 2
r 2
CHROMIUM
PLATING
5. Storage and handling of piston rings
Store the piston rings in a dry place and lay them horizontally on a flat surface,
keeping them in their original packing. Handle with care when preparing for use
and avoid any hard contact against other objects.
2010 / 50−D
Piston: Checking Piston Ring Wear
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