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www.marinelink.com 43statistics show most bearing damages come from human errors in connection with opening and closing for inspections. If certain parameters, such as bearing clearances and oil ß ow, are found to be normal then opening the bearings can be omitted.The TBO work for the engine included. 1. Annual conditions check of the main chains and retightening.2. Annual conditions check and tight- ening of stay-bolts, holding down bolts and side and end chocks.3. Annual conditions check of the start- ing air distributor. 4. Annual conditions check of the crankcase relief valves.5. Overhaul of the maneuvering system and the reversing and VIT-system for the fuel pumps. It is of importance to do such work at regular intervals of two years in order to ensure the ability to maneuver the engine safe at any time.To ensure the quality of the service work, Transmarine Propulsion Systems Inc. used its own engineers, which all have more than 25+ years of experience in diesel engine service. Combining this experience with the customer?s ß eet op- eration data and the experience available from the engine builder, provides TMPS the ability to structure a reliable and ß ex-ible maintenance program.Using only OEM spare parts, which are developed and tested to withstand the prolonged running hours between overhauls, makes the combination of the CBO and TBO methods the optimum way of securing cost efÞ cient reliability in the engine performance. The result is a dependable and high quality service, which will allow the engine to perform with reliability and at the same time save on the cost of the spare parts.When engines are overhauled it is im-portant to pay attention to the condition of the components being overhauled, particularly to those involved in the com-bustion process. Proper documentation of the overhauled components, in way of pictures and service schemes should be prepared of the ?as found? condition, together with the proper description of parts replaced and measurements of parts re-used. When the engine is put back into service a complete engine performance analysis should be commenced in order to ensure that all operating parameters are within acceptable limits speciÞ ed by the engine manufacturer. Bear in mind that while a proper sea-trial with all the engine performance re-corded should always be done to form a basis of the condition after the overhaul is completed. Transmarine also can rec- ommend taking a set of readings before the overhaul as to compare the before and after results. In this particular over- haul, this service was not carried out after this docking. The reason is that most of the time the vessel will be in ballast con-dition, and thus it is often not possible to load the engine proper beyond 50%. Sometimes it is also a matter of time avail-able due to commercial commitments. It can therefore alternatively be suggested that the crew makes a complete set of service readings at different engine loads (50%, 75%, 85% and as close to 100% as possible) and forward these to TMPS for evaluation. Performance analyses are also an invaluable tool for the workboat or medium speed diesel engine operator. By peering into each individual cylinders combustion data can isolate the less than desirable performance characteristics of that cylinder or cylinders. In some cases the analyses can predict the remaining service life of the engine pre-overhaul or prolong the overhaul period and extend the running hours. Jesper Peterson started his career as an engineer apprentice in Denmark in 1977, Mr. Petersen obtained a BS in Ma- rine Engineering and completed his mili-tary service. He then went on to serve in a series of leadership roles for one of the world?s largest engine manufacturers, MAN Diesel & Turbo, from 1984-2011. MR #1 (42-50).indd 43MR #1 (42-50).indd 431/3/2013 11:30:47 AM1/3/2013 11:30:47 AM