Man B&W S80ME-C7, Project Manual

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MAN B&W 1.06
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MAN Diesel
MAN B&W ME/MEC engines 198 46 139.4
ME Engine Description
Please note that engines built by our licensees
are in accordance with MAN Diesel drawings and
standards but, in certain cases, some local stand-
ards may be applied; however, all spare parts are
interchangeable with MAN Diesel designed parts.
Some components may differ from MAN Diesel’s
design because of local production facilities or
the application of local standard components.
In the following, reference is made to the item
numbers specified in the ‘Extent of Delivery’ (EoD)
forms, both for the ‘Basic’ delivery extent and for
some ‘Options’.
Bedplate and Main Bearing
The bedplate is made with the thrust bearing in
the aft end of the engine. The bedplate consists
of high, welded, longitudinal girders and welded
cross girders with cast steel bearing supports.
For fitting to the engine seating in the ship, long,
elastic holdingdown bolts, and hydraulic tighten-
ing tools are used.
The bedplate is made without taper for engines
mounted on epoxy chocks.
The oil pan, which is made of steel plate and is
welded to the bedplate, collects the return oil from
the forced lubricating and cooling oil system. The
oil outlets from the oil pan are normally vertical
and are provided with gratings.
Horizontal outlets at both ends can be arranged
for some cylinder numbers, however this must be
confirmed by the engine builder.
The main bearings consist of thin walled steel
shells lined with bearing metal. The main bearing
bottom shell can be rotated out and in by means
of special tools in combination with hydraulic
tools for lifting the crankshaft. The shells are kept
in position by a bearing cap.
Frame Box
The frame box is of welded design. On the ex-
haust side, it is provided with relief valves for each
cylinder while, on the manoeuvring side, it is pro-
vided with a large hinged door for each cylinder.
The crosshead guides are welded on to the frame
box.
The frame box is attached to the bedplate with
screws. The bedplate, frame box and cylinder
frame are tightened together by stay bolts.
Cylinder Frame and Stuffing Box
The cylinder frame is cast, with the exception of
the S65MEC which is welded, and is provided
with access covers for cleaning the scavenge air
space, if required, and for inspection of scavenge
ports and piston rings from the manoeuvring side.
Together with the cylinder liner it forms the scav-
enge air space.
The cylinder frame is fitted with pipes for the pis-
ton cooling oil inlet. The scavenge air receiver, tur-
bocharger, air cooler box and gallery brackets are
located on the cylinder frame. At the bottom of the
cylinder frame there is a piston rod stuffing box,
provided with sealing rings for scavenge air, and
with oil scraper rings which prevent crankcase oil
from coming up into the scavenge air space.
Drains from the scavenge air space and the piston
rod stuffing box are located at the bottom of the
cylinder frame.
Cylinder Liner
The cylinder liner is made of alloyed cast iron
and is suspended in the cylinder frame with a
lowsituated flange. The top of the cylinder liner
is fitted with a cooling jacket. The cylinder liner
has scavenge ports and drilled holes for cylinder
lubrication.