General
The engine is a turbocharged, single-acting four-
stroke diesel engine of the trunk piston type with a
cylinder bore of 270 mm and a stroke of 380 mm.
The crank shaft speed is 720 or 750 rpm.
The engine can be delivered as an in-line engine
with 5 to 9 cylinders.
For easy maintenance the cylinder unit consists of:
the cylinder head, water jacket, cylinder liner, piston
and connecting rod which can be removed as com-
plete assemblies with possibility for maintenance by
recycling. This allows shoreside reconditioning work
which normally yields a longer time between major
overhauls.
The engine is designed for an unrestricted load pro-
file on HFO, low emission, high reliability and simple
installation.
Figure 1: Engine frame.
Engine frame
The monobloc cast iron engine frame is designed to
be very rigid. All the components of the engine
frame are held under compression stress. The
frame is designed for an ideal flow of forces from
the cylinder head down to the crankshaft and gives
the outer shell low surface vibrations.
Two camshafts are located in the engine frame. The
valve camshaft is located on the exhaust side in a
very high position and the injection camshaft is
located on the service side of the engine.
The main bearings for the underslung crankshaft
are carried in heavy supports by tierods from the
intermediate frame floor, and are secured with the
bearing caps. These are provided with side guides
and held in place by means of studs with hydrauli-
cally tightened nuts. The main bearing is equipped
with replaceable shells which are fitted without
scraping.
On the sides of the frame there are covers for
access to the camshafts and crankcase. Some
covers are fitted with relief valves which will operate
if oil vapours in the crankcase are ignited (for
instance in the case of a hot bearing).
Base frame
The engine and alternator are mounted on a rigid
base frame. The alternator is considered as an inte-
gral part during engine design. The base frame,
which is flexibly mounted, acts as a lubricating oil
reservoir for the engine.
Cylinder liner
The cylinder liner is made of special centrifugal cast
iron and fitted in a bore in the engine frame. The
liner is clamped by the cylinder head and rests by
its flange on the water jacket.
MAN Diesel & Turbo
1689477-8.1
Page 1 (7)
General description
B 10 01 1
L27/38S, L27/38
2015.11.26
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