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DUQ1-176E Piston Ring Specifications for Modern Engines

With the increasing engine power and the recent change in the situation for engine operation, for example, popularization of low load operation, reducing cylinder oil consumption, degrading heavy fuel oil, and so on, required performance of piston ring becomes increasingly sophisticated.

DUQ1-184E Cylinder Liner Calibration

In order to estimate piston running condition and/or determine suitable overhauling interval of cylinder liner, it is very important to understand exact trends of cylinder liner wear. There is a possibility that erroneous liner wear data by an improper measurement leads to a misjudgment about cylinder liner condition.

DUQ1-185E Leaked fuel ways and telltale on IFA and related parts

When fuel leakage occurs at IFA (Intermediate Fuel Accumulator) and related parts on IFA, leaked fuel is led to sight glass or inspection cocks in order to detect and find damaged components.

MAN B&W SL2017-650/SRJ Guiding Overhaul Intervals

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.

DUQ1-017E-2 Metal loss and heat crack of FOV atomizer Pocket on Cylinder Cover

Cases have been reported where cylinder cover were found like burning off and / or heat crack in the vicinity of the pocket for fuel nozzle atomizers is attributable to attack by high temperature corrosion such
as Vanadium attack (See to Fig.1).
The most probable cause of this phenomenon would be resulted from the following reasons

DUQ1-008E Cracks on Piston skirts RTA58 -68 - 76 - 84

It was ascertained that on some RTA "8" series engines in service piston skirts have been cracked at the flange clamped between a piston head and a piston rod, when they were overhauled. On this problem, the licensees in Japan have been examining and investigating earnestly in cooperation with each other as well as the licenser, Sulzer, and then we reached a conclusion that the piston skirts can be employed continuously without any problem though they get cracks.

DUQ1-006E RTA Type Engines Simple Estimation of Piston Ring Wear Amount

For measurement of a piston ring wear amount, it is an usual way to remove a piston ring and measure the ring width by using a gauge. This requires much expense and time because of the necessity of piston with drawing.
Therefore, we introduce a method in which the wear amount can be estimated indirectly by ring gap length hereinafter:

DUQ1-005E-1 RTA / RT-flex Exhaust valve air spring, low air pressure problem

An increasing of an air consumption of the exhaust valve air spring will effect the exhaust valve timing to make engine performance worse. In case the air pressure is too low, the engine will be tripped during operating or can not start.

 

MAN B&W SL2017-653/PRP Accumulators - All Makes

We refer to our service letter SL2006-469 concerning accumulators.
The information in this letter and in the instructions attached replaces the information given in our service letter SL06-469/JOF.
To prevent undesirable pressure peaks in the hydraulic oil system, we emphasise the importance of checking the nitrogen pressure regularly, which according to the instruction manual means every 2,000 hours or every 6 months, whichever occurs first.

MAN B&W SL2 017-654 Crankshaft Torsional Damper

Service experience has proven that the intermediate inspection of the torsional vibration damper on the crankshaft of our mentioned GenSets can be omitted without compromising a reliable engine operation.
This applies to both for new engines and to engines in service.

MAN B&W Service experience for ME-C and ME-B types

This paper describes in detail the service experience Very close to 100% of these engines are of the electronically controlled ME-C and ME-B types.

Blended Edge Main Bearings
The blended edge (BE) design was introduced on thin shell white metal main bearings to better cope with crankshaft inclinations and thereby increase the resistance towards edge fatigue failures. The blended edge design is the corresponding item to the thick shell flex-edge design for MC engines.
Filtration Handbook Filtration and Flushing Strategy
The exacting tolerances in today’s hydraulic systems require tight control of the system contamination. Experience has shown that impurities found in the system originate from the installation and from new oil. If not removed, particles will cause damage to valves, pumps and bearings and, eventually, lead to malfunction of the system and increased wear on the hydraulic components.
Multiway Valve Overhaul Programme SL2017-646

MAN Diesel & Turbo introduces a new overhaul programme for multiway valves in continuation of our hydraulic pump overhaul programme.
With the increasing number of ME, ME-B and ME-C engines in service, there is a need for customer-friendly and tailor-made solutions suited for all ME engines.

Fees for Technical Assistance and Advisory Work SL2017-642

This service letter informs MAN B&W engine owners and operators of PrimeServ’s prices on service rendered from Denmark and from our service centres around the world.
The fees are valid from March 2017 for assistance rendered by personnel based in Denmark.

Guidelines for Operation on Fuels with less than 0.1% Sulphur
This paper is a guideline for owners, operators and crews on how to prepare for the changes in fuel characteristics and how to operate in compliance with the new sulphur limits in sulphur emission control areas (SECA) as of 1 January 2015. The SECAs currently included are the Baltic Sea, The North Sea, the English Channel and waters within 200 nautical miles from the coast of USA, the coastal waters around Puerto Rico and the U.S. Virgin Islands (the US Caribbean ECA) and Canada.
Cleaning of Heavy Fuel Oil and Maximum 0.10% Sulphur Fuels SL2017-638/DOJA

This Service Letter specifies the recommended maximum acceptable level of cat fines entering the engine, which is as follows:
ƒAlways keep the level as low as possible and, max. at 15 ppm
Al + Si at engine inlet for short periods.
Some guidelines on optimal operation are also given:

New Design of High-Pressure Hydraulic Hoses SL2017-639

In 2006 a new design of hydraulic hoses with protective tubing was introduced to minimize the risk of personal injury in the event of a rupture.
During service attendance we still see many ships using the old type of hydraulic hoses without the protective tubing. As our service personnel have reported near miss incidents with ruptured hydraulic hoses, it is of almost importance that this risk is eliminated.

RT-175 Troubleshooting & maintenance on Injection Control Unit (ICU)

This guideline summarises the required checks to investigate possible causes in case of alarms indicating improper function of the ICU.
Unnecessary costs may be avoided by simple rectifying actions instead of an ICU replacement and shipping to a Wärtsilä service centre; e.g. exchange of available spare parts or a proper understanding of the alarms.
Should a problem not be rectified by the described countermeasures, however, replacement of the ICU must be taken into consideration.

Product Safety Warning Total Solutions & Power (TSP) accumulators

We refer to our Product Safety Warning Letter SL2016-614/PRP of May 2016, where we informed you about incidents reported with TSP accumulators which have suffered from breakage.