Wartsila RT-flex50-D User Manual

Maintenance
3403−4/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
1/ 1
Tools:
1 Feeler gauge 94122
1 Template 94366a
1 Template 94366b
Every time a piston is pulled the piston top surface contour must be checked with
the checking template 94366b. The template is placed on the topmost piston ring
and rotated around the piston axis (see Fig. ’A’).
The depth of possible burn scars can be checked with feeler gauge 94122 or a
depth gauge. With the latter measure from the outer contour of template 94366b to
the crown top (the effective depth is obtained by subtraction of gauge width from
measured height).
D Where burn scars are only slight it is sufficient to grind them over and to
smooth sharp-edged zones with emery cloth. Where, however, burn scars ex-
ceed x = 10 mm the original material thickness must be restored by surface
welding. This entails the removal of the piston crown.
Before re-starting the engine, the reason for such heavy burns should be estab-
lished. The causes must be remedied.
Causes of heavy burn scars may be:
− Poor combustion
− Worn nozzles
− Heavy local carbon deposits on top of the pisto
n
crown etc.
The template 94366a should be used if the shape
of
the crown top of a piston in situ has to be checke
d.
As shown in Fig. ’B’, the template is to be pushe
d
through one of the scavenge ports of the cylinder li
n-
er and placed on top of the piston crown.
94366a
A
B
x
94366b
018.587/09
x
PISTON
RING
009.901/02
P
iston
C
hecking Piston Top Surface
50−D / 2010
CHECK

Wartsila RT-flex50-D Specifications

General

Brand	Wartsila
Model	RT-flex50-D
Category	Engine
Language	English