Maintenance
3403−1/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
7/ 8
5. Fitting the piston
Prior to fitting the piston, the following works must be carried out:
⇒ Remove piston rings with tensioning device 94338 (see 3425−1) and clean
piston exterior thoroughly (do not use any tools that might damage the sur-
face!).
Establish the height of the piston ring grooves (see Clearance Table 0330−1
’Piston and piston rings’).
⇒ Clean piston rings and measure them.
Remark: For refitting of used and new piston rings, follow strictly the instructions in
3425−1.
D When refitting used piston rings be sure to fit them in the same grooves
as before.
D Fit the piston rings in such a manner that their marking TOP is on top.
Check the piston top surface (see 3403−4).
Measure bore of cylinder liner (see 2124−1) and carry out any needed recondition-
ing to lobricating grooves and scavenge ports (see 2124−3).
⇒ Actuate the cylinder lubrication until oil flows from all the lubricating points.
D Piston rod gland and both distance holders 94345 must be mounted on the
piston rod (see 2303−1).
⇒ Place insertion funnel 94342 for piston rings on the water guide jacket 20.
D Suspension device 94341 must be fastened to the top of the piston crown.
⇒ Smear piston rings, piston skirt, piston rod and running surface in cylinder lin-
er lavishly with bearing oil.
H
94342
17
20
18
013.260/05
2010
Piston: Removal and Fitting
CHECK
CHECK
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