WinGD WARTSILA RT-flex58T-D, Maintenance Manual

Page: 255 / 498

Maintenance
3403 − 1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
7/ 7
H
GF 94343
GF 94342
4.2 Fitting
⇒ Turn crank of the cylinder concerned to T.D.C.
⇒ Slightly lift piston by crane. Loosen screwed con-
nections 17 (Fig. ’E’) and push both supports 15
outwards. Then lift the piston including piston rod
gland 8 so far that the two hinged covers 18 can be
turned up.
⇒ Bring the piston over the cylinder liner and then
slowly lower it.
D
When the piston is lowered into the cylinder liner
until the lowest piston ring is at the upper level of
insertion funnel GF 94342, arrange the piston
rings so that their gaps alternate by 180 _ to each
other (see 3425 − 1 ).
⇒ Slowly lower the piston further until its piston rod
foot has arrived just above the crosshead pin.
While one person directs the further lowering of the
piston from the top, another directs the piston rod
progress from the engine interior and how it must
be turned to guide the piston rod foot without jam-
ming into centring pins 5 (Fig. ’A’) in the crosshead
pin 4.
⇒ Slacken the crane rope a bit and remove the sus-
pension device.
⇒
Turn piston to B.D.C. and direct the insertion of the
piston rod gland into its seating bore in the cylinder
block (see 2303 − 1 ).
⇒ Loosen and remove both distance holders from
the piston foot.
⇒
Firmly tighten all screws fastening the piston rod
gland housing.
⇒ Tension elastic studs 6 for the piston rod foot fas-
tening as described in section 2.
⇒ Refit the antipolishing ring (see 2124 − 2 ).
94345
5. Leak test
A leak test must be carried out after every fitting of a piston in the cylinder. For this,
start the bearing lubrication pump and set the bearing lubricating pressure. Check
through the scavenge space on the fuel side in the cylinder block (piston under-
side) whether cylinder liner running surface and piston rod remain dry.
Any increase in the dirty oil level in the scavenge air space may be caused by a
faulty O-ring in the piston.
V2 / 2013
Piston: Removal and Fitting