Caterpillar Marine - Marine Engines Caterpillar

The picture is showing an engine of the new generation of M20 series,
an 8 M 20 C
and 9-cylinder version. With an output
per cylinder of 170 kW at 900 rpm or
190 kW at 1,000rpm, they offer a performance
range of 1,020-1,710 kW.
The M20 series as the smallest series
of the current MaK long-stroke
engine range is designed for installation
as propulsion engine for small
cargo ships, e.g. coastal freighters and
inland waterway vessels, as propulsion
unit for work boats, such as tugs,
fishing vessels and offshore ships,
The Schubboot “Veerhaven VIII” is driven by three MaK M 20, which has passed
already more than 77.000 running hours
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and as auxiliary genset for generating
electricity on containerships and
passenger vessels.
Extensive operating experience
Caterpillar Marine Power Systems
has sold over 1,100 engines of the
MaK M 20 type since its introduction,
with 43% being installed as main propulsion
plant and 57% as genset or
intended for this purpose. The first
engine of this type delivered was put
into operation in 1992 as the propulsion
plant for an inland waterway
tanker. The approx. 900 engines
installed since then have proved their
reliability with an overall service life
exceeding 19 million operating hours.
The propulsion engines installed in
inland waterway vessels have had
the longest service life. Thus, the propulsion
engine of the inland waterway
tanker (6M20) “Stold Rom” (ex
“Alchimist Frankfurt”) has clocked up
over 78,000 operating hours, closely
followed by the propulsion engine
of the pusher craft “Veerhaven
VIII” with 77,000 operating hours.
It is worth noting that 57% of the
engines deployed as auxiliary gensets
and 13% of the units as main engines
run on heavyfuel.
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New design features of the M 20 C
The enhancement based on operating
experience and new research findings
includes the following main design
modifications:
Dual-circuit cooling system with
easier installation and increased efficiency
based on higher cooling water
temperatures of up to 90°C
Simplification of the design of the
exhaust gas lines including complete
cladding of the exhaust gas system
for an even more compact and easily
maintainable engine with correspondingly
reduced space requirement
Upgraded turbocharging with a turbocharger
with higher efficiency
The success story of the M 20 in the
market will be continued with the
M 20 C thanks to its design features
and simplified maintenance and
a further reduction in piping. The
transition will be smooth, beginning
with engine deliveries from autumn
2006.