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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 diesel 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. 

  • 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
  • SL2021-711
    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
  • SL2020-704
    pdf, 507 KB
    Inventory of Hazardous Materials (IHM)
  • SL2020-703
    pdf, 13502 KB
    Authorized repair agent for Mitsubishi turbochargers - MAN PrimeServ Omnicare
  • SL2020-702
    pdf, 2878 KB
    Overspeed incident with disintegrated flywheel
  • SL2020-701
    pdf, 1408 KB
    Third-party spindle guides and nozzles - increased risk of scavenge space fire
  • SL2020-700
    pdf, 1079 KB
    Retrofitting of PLC (Replaces SL2012-564/JXN)
  • SL2020-699
    pdf, 521 KB
    Regular operation of EGR systems - EGRBP and EGRTC systems
  • SL2020-698
    pdf, 1189 KB
    CPR piston ring pack
  • SL2020-697
    pdf, 377 KB
    Engine room crane safety
  • SL2020-696
    pdf, 627 KB
    Inlet pressure settings for air starters
  • SL2020-695
    pdf, 628 KB
    Regular operation of the SCR system to maintain correct functionality
  • SL2020-694
    pdf, 503 KB
    Cylinder and system oils
  • SL2020-693
    pdf, 627 KB
    Cybersecurity - MAN EngineVault
  • SL2020-692
    pdf, 683 KB
    LDCL cooling system update - for operation on very-low-sulphur fuels
  • SL2020-691
    pdf, 1263 KB
    Fretting marks on piston crown and skirt assembly surfaces
  • SL2020-690
    pdf, 1186 KB
    Fees for technical assistance and advisory work - MAN PrimeServ, Copenhagen
  • SL2019-689
    pdf, 621 KB
    Extended guiding overhaul intervals – for ME-GI and ME-GIE engines Appendix to SL2019-681/SRJ
  • SL2019-688
    pdf, 550 KB
    MAN SCR NOx sensors
  • SL2019-687
    pdf, 1557 KB
    Liner jacket cooling water system update - for operation on low-sulphur fuels
  • SL2019-686
    pdf, 517 KB
    Cylinder and system oils
  • SL2019-685
    pdf, 1131 KB
    Condition-based overhaul Cermet-coated piston rings
  • SL2019-684
    pdf, 910 KB
    Piston cleaning ring Update of the instruction for piston cleaning ring replacement

ll 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