Maintenance3303−2/A1 RT-flex50-D
Wärtsilä Switzerland Ltd
4/ 4
3. Fitting the bearing shells
Fitting of the bearing shells (and bearing cover) is carried out analogously to the
removal but in reverse sequence, whereby attention must be paid to the following:
D The surface of the crankpin must be in perfect condition.
D The contact surfaces of the shell rear side and the bearing bore must be free
from any damage.
D While fitting bearing shells prevent dirt or foreign particles from entering be-
tween the shell rear surface and its seating! Immediately before inserting the
bearing shells wipe them with a slightly oily hand.
D The bearing shell should be placed in the connecting rod head such that it pro-
trudes by the same distance at both ends of the separating face.
This protrusion is a must and under no circumstances must the separating
face of the bearing shell be filed to reduce it!
H
013.540/05
Protrusion of new bottom
end bearing shells:
x
1
+ x
2
= approx. 0.78 − 0.94 mm
(total for both bearing shells)
Remark: Above measuring checks must be carried out when fitting new bearing
shells. For this the bearing shells are placed in position, the bearing cover fitted
and the nuts tightened by hand with a round bar.
Prior to final assembly smear the running surfaces lavishly with clean bearing oil.
Should, however, the engine have to be frequently turned after the fitting of the
bearing, or should a re-start of the engine not be immediately planned, then
instead of bearing oil a mixture of
2
/
3
steam-engine cylinder oil and
1
/
3
normal bear-
ing oil should be used. Special oils suited to this purpose are also available from
reliable suppliers.
In order to further reduce the risk of dry running on newly fitted bearing shells, the
latter can be post-lubricated by means of a lubricating pump (see 3303−3).
Inspection, Removal and Fitting of Bottom End Bearing
2010
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