Maintenance
3425
−
1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
5.
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.
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 relevant indications in
the Operating Manual 0410
−
1.
Standard piston ring arrangement:
Ring type
Coating / material
Application
Uppermost piston ring ’a’
1 x SCP1CC16_
S
traight
C
ut
chrome-ceramic
coated
for new and fully
honed cylinder liners
as well as for used
cylinder liners in
good conditions
Piston rings ’b’, ’c’ and ’d’
3 x SCP2CC16_
S
traight
C
ut
chrome-ceramic
coated
G
017.684/08
r 2.0
TOP
c
d
r 2.0
TOP
b
a
CHROMIUM
PLATING
CHROMIUM
PLATING
CHROMIUM
PLATING
CHROMIUM
PLATING
r 2.0
TOP
r 2.0
TOP
6.
Storage and handling of piston rings
Store the piston rings in a dry place but not in a place contaminated with exhaust
gases or any other corrosive atmosphere. Lay the piston rings 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.
2013-08
Checking Wear of Piston Rings and Ring Grooves
with Four Piston Rings
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