MAN B&W

Kindly note that our program 2025 has been released and is available on  WebGate. We are excited to announce that we have included in our Program courses on dual fuel engines, ME-GA and ME-GI, alongside our existing courses on ME-C and ME-B engine types, as well as EGR system.

We have collected several useful procedures which can be easily accessed by the operator in the case that external troubleshooting and advice is needed..
This document applies to MAN B&W two-stroke marine Electronic diesel engines operation.

Updated tables Replaces SL2019-681/SRJ.  Based on the latest service experience and engine development we are pleased to issue a revised version of the guiding overhaul intervals tables. The guiding overhaul intervals apply to electronically controlled ME and dual-fuel type engines.

This service letter contains important information concerning recommended inspections to be carried out on engines in the unlikely event that an uncontrolled overspeed incident has occurred.
Engine over speed can be categorized as follows:

We would like to draw your attention to the use of PMI sensors for measuring cylinder pressure on MAN B&W two-stroke engines.
The cylinder pressure is used for various applications, such as balancing of maximum pressure, compression pressure, mean indicated pressure, fuel quality adjustment, and load estimation.

Controlling wear rates and good cylinder conditions are essential for optimising component service life and overhaul intervals. New guidelines for iron (Fe) content and base number (BN) of the scavenge drain oil. Guiding intervals for sampling and advise on interpretation of the results.

This Service Letter contains guidelines on the recommended lubrication of cylinder liner and piston.
The combustion of very-low-sulphur fuel oil (VLSFO, <0.50% S) and ultra-low-sulphur fuel oil (ULSFO, <0.10% S) in dual-fuel engines has caused a shift in main focus from corrosive wear of cylinder liner and piston rings toward cylinder condition (cleanliness).

MAN Energy Solutions uses Continental NOX sensors for both SCR and EGR systems (O2 sensors). Continental guarantees that their NOX sensors have a lifetime of 2,000 hrs. After this point in time, Continental recommends exchanging the sensors.

Due to a regrettable delay in the development work and necessary service documentation of our reconditioning procedure for the exhaust valve spindles mentioned in this Service Letter, we inform you that reconditioning of those spindles is not allowed until further
notice.

We have recently received reports of the starting air main valve not closing after activation. The result is in a continuous drainage of the starting air pressure from the air tank reservoir until a point where the engine is not able to start.

Safe design and operation of two-stroke MAN B&W combustion engines are key to MAN Energy Solutions. Over the years, we have come across examples of non-MAN Energy Solutions safety systems that failed to meet the required standard and human
behaviour that potentially could result in crankcase explosions.

Exhaust valve spindles with a bottom burn-off rate resulting in a spindle life exceeding 16,000 hrs. or 24,000 hrs., depending on whether the engine bore size is smaller or larger than 60-cm bore, will need preventive spindle seat grinding to mitigate the risk of dent mark formation, eventually resulting in seat blow-by.

MAN Energy Solutions has introduced MAN B&W dual-fuel engines (ME-GI/E and ME-LGIM/P) for liquefied natural gas (LNG), methanol (MeOH), ethane (LEG), and liquefied petroleum gas (LPG).
The range of application of these engines has expanded from main engines on LNG, methanol, and LPG carriers to cover the full range of vessel types

The ME-GI/GIE Pump Vaporiser Unit (PVU) is a standardized high-quality pump unit for supply of LNG or ethane to MAN B&W two-stroke ME-GI/GIE engines. With a compact and intelligent design, the PVU provides a lean design and integration in the fuel gas supply system (FGSS).

CyIinder lubrication update for operation on ULSFO, VLSFO, biofuel, LNG, LEG, LPG, methanol, and HSFO
SL2023-737/NHN June 2023 (replaces SL2014-587/JAP and SL2019-671/JAP)
Concerns
Owners and operators of MAN B&W two-stroke marine diesel engines.
Type: ME/ME-C/ME-B/MC/MC-C/ ME-GI/ME-GIE/ME-LGIM/ME-LGIP and ME-GA engines

Controlling wear rates and good cylinder conditions are essential for optimising component service life and overhaul intervals.
The cylinder condition must be monitored by performing a monthly visual inspection through the scavenge air ports and by acquiring a scavenge drain oil analysis (SDA) from an accredited laboratory

Check the cylinder condition frequently and ensure that the piston ring pack is clean and moving freely.
In case of deposits, use oil with higher detergency to clean.
General guidance for operation on:

Based on the latest service experience and engine development we are pleased to issue a revised version
of the Guiding Overhaul Intervals tables. The guiding overhaul intervals apply to electronically controlled ME type engines, dual fuel ME-GI type engines, and me - chanically controlled MC type engines.

This paper describes in detail the service experience of ME-GI, ME-GIE and ME LGIM engines. Furthermore, the latest experience from our large bore engines is described.
Technologies to meet Tier III requirements and our new TCEV/ FBIV designs are also touched upon.

This paper provides the reader with an understanding of how the hull and propeller affect the engine running conditions and vice versa.