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Service Letters

This is a collection of service letters published by MAN Energy Solutions, Copenhagen/Holeby, Denmark, covering both MAN B&W two-stroke and MAN four-stroke combustion engines.

Our service letters provide information on new engine developments and trends, service experience, important aspects of engine management and maintenance, and emissions requirements compliance and development, etc. 

Table of content

  • Service Letters, Four-stroke - Table of content
    pdf, 852 KB
  • Service Letters, Two-stroke – Table of Content
    pdf, 294 KB


  • SL2023-734
    pdf, 811 KB
    Local monitoring control and safety, LMCS base module 2 replacement.
  • SL2023-733
    pdf, 578 KB
    Starting air valve - Failure to close
  • SL2023-732
    pdf, 1195 KB
    Fees for technical assistance and advisory work.
  • SL2022-731
    pdf, 884 KB
    Correct installation of lubricating oil supply valve for the Alpha Lubricator. Non-flow cylinder oil alarm
  • SL2022-730
    pdf, 2614 KB
    Prevention of crankcase explosions. The latest safety components standard
  • SL2022-729
    pdf, 847 KB
    Preventive grinding of exhaust valve seats
  • SL2022-728
    pdf, 508 KB
    Cylinder and system oils MAN B&W low-speed two-stroke engines
  • SL2022-727
    pdf, 772 KB
    Regular dp-RTV and RTV position check of SCR installations
  • SL2022-726
    pdf, 3213 KB
    Service experience with 2020-compliant fuels
  • SL2022-725
    pdf, 681 KB
    Updated evaluation guidelines - piston ring coating and deposit build-up on piston ring lands
  • SL2022-724
    pdf, 873 KB
    Inlet and exhaust valve issues when operating on low-sulphur fuels
  • SL2022-723
    pdf, 487 KB
    EEXI Compliance
  • SL2022-722
    pdf, 539 KB
    Running without gas injection for prolonged periods
  • SL2022-721
    pdf, 850 KB
    Excessive wear on the locking keys of crankshaft thrust bearing.
  • SL2022-720
    pdf, 1263 KB
    Fees for technical assistance and advisory work
  • SL2021-719
    pdf, 687 KB
    Cleaning of fuel injection nozzles
  • SL2021-718
    pdf, 882 KB
    Overspeed incident with disintegrated flywheel ̶ Updated information
  • SL2021-717
    pdf, 690 KB
    Safety during emergency repair Safety precautions
  • SL2021-716
    pdf, 538 KB
    Reaming of valve guide after replacement
  • SL2021-715
    pdf, 1039 KB
    Starting air system Main engine and requirements to auxillary system
  • SL2021-714
    pdf, 1222 KB
    Low-load operation 5% to 40% engine load
  • SL2021-713
    pdf, 503 KB
    Removal and re-installation of drive end hub on the crankshaft
  • SL2021-712
    pdf, 2359 KB
    Inspection of valve roller guide
  • SL2021-711
    pdf, 326 KB
    New PCU card for AT2000
  • SL2021-710
    pdf, 6149 KB
    New procedure for honing of cylinder liners
  • SL2021-709
    pdf, 433 KB
    Safety screen filter
  • SL2021-708
    pdf, 1271 KB
    Fees for technical assistance and advisory work - MAN PrimeServ, Copenhagen
  • SL2020-707
    pdf, 904 KB
    Fuel leakage – from high-pressure pipes and low-pressure circulation lines
  • SL2020-706
    pdf, 1049 KB
    Fretting in main bearing bore (replaces SL2017-645)
  • SL2020-705
    pdf, 653 KB
    Load-up program Update of load-up recommendations in SL09-503/JAP

All data provided on this site is for information purposes only, explicitly non-binding and subject to changes without further notice.

Unless otherwise stated, the copyright and any other rights in the contents of the Service Letters available through our website, including any images and text, are owned by MAN Energy Solutions.

For the avoidance of doubt, you must not adapt, edit, change, transform, publish, republish, distribute, redistribute or show in public the Service Letters (in any form or media) without the prior written consent of MAN Energy Solutions.

Permission is granted to:

1) download, display or print material for personal use or use within an individual organisation and for a non- commercial purpose;

2) create links to these pages;

3) reproduce short extracts provided the source is stated. 


Requests for further authorisation regarding proposed usage of the information provided should be addressed to: 

MAN Energy Solutions
Teglholmsgade 41
2450 Copenhagen SV
or by email to