Expert system support

MaK offers intelligent expert systems to lower operational costs, minimize downtime and increase availability. DICARE is a Windows-based expert system providing real-time engine diagnosis. It describes and diagnoses the actual engine condition and provides references for condition-based maintenance. Remote data transfer to a shipowner's shore base is facilitated by a communication module; additionally, MaK offers a link to its service department for evaluating and interpreting the data.

DIMOS is a computer-based maintenance and service system covering MaK engines. It delivers service interval supervision and immediate access to maintenance and component information via an electronic operations handbook. Bus-technology underwrites safe digital signal transmission and represents a clearly defined connecting point for all ship management systems.

M43 engine design data






Power range

Mean piston speed

Mean effective pressure

Maximum combustion pressure

Specific fuel consumption*

Specific lube oil consumption

430 mm 610 mm 900 kW/cyl 500/514 rev/min 6,7,8,9L/V12,16,18 5400-16 200 kW 10.2/10.5 m/s 24.4/23.7 bar 190 bar 175 g/kWh 0.6 g/kWh

* 100 per cent mcr


Numerous examples of earlier MaK medium speed designs are in service in propulsion and auxiliary power installations based on 240 mm bore M282C/M332C, 320 mm bore M453C, 450 mm bore M552C and 580 mm bore M601C engines. The 'C' designation models were introduced in the 1980s with refinements enhancing the capability to operate on heavy fuel (Figure 21.8).

The robust engines feature housings of high duty cast iron which, in the case of the 320 mm bore and larger models, take the form of multi-sectional blocks connected by steel tension rods. The high pre-stressing of the rods, which keep the cast components under compression stress, prevents any tensile stress in the cast material, even under ignition loads. The 240 mm bore series features an underslung crankshaft.

The cylinder liners of all the engines are salt-bath-nitrated for high wear resistance and anti-corrosion properties; crankshafts are forged in one piece from wear-resistant, quenched and tempered alloy steel. Single fuel injection pumps are used throughout the series, the injection system and inlet/exhaust valves being controlled by a one-part camshaft.

22 MAN B&W Diesel

A long tradition in medium speed engine design was exploited by MAN B&W Diesel to create a new generation of 400 mm, 480 mm and 580 mm bore models sharing common principles. The 40/54, 48/60 and 58/64 series (Figure 22.2), progressively launched during the 1980s, were joined in 1992 by the 32/40 design which inherited similar features but modified to suit its smaller bore. The four engines form the core of the Augsburg, Germany-based group's programme offering outputs from 2880 kW to 21 600 kW (see Table 22.1), which now also embraces a more powerful B-version of the 48/60 engine and a V40/ 50 design.

Man Diesel
Figure 22.1 An eight-cylinder version of MAN B&W Diesel's largest medium speed engine design, the L58/64

L58/64 L48/60 L40/54

Figure 22.2

L58/64 L48/60 L40/54

Figure 22.2

Table 22.1 MAN B&W 'new generation' medium speed engines


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