6.2.3 Documentation for an engine parameter check method

 Every marine diesel engine shall have a technical file as required in 2.3.6 which identifies the engine's components, settings or operating values which influence exhaust emissions and must be checked to ensure compliance.

 Shipowners or persons responsible for ships equipped with diesel engines required to undergo an engine parameter check method shall maintain on board the following documentation in relation to the on-board NO_x verification procedures:

• .1 a record book of engine parameters for recording of all the changes made relative to an engine's components and settings;

• .2 an engine parameter list of an engine's designated components and settings and/or the documentation of an engine's load-dependent operating values submitted by an engine manufacturer and approved by the Administration; and

• .3 technical documentation of an engine component modification when such a modification is made to any of the engine's designated engine components.

 Descriptions of any changes affecting the designated engine parameters, including adjustments, parts replacements and modifications to engine parts, shall be recorded chronologically in an engine's record book of engine parameters. These descriptions shall be supplemented with any other applicable data used for the assessment of the engine's NO_x levels.

  6.2.3.4.1 Dependent on the specific design of the particular engine, different NO_x—influencing modifications and adjustments are possible and usual. These include the engine parameters as follows:

• .1 injection timing,

• .2 injection nozzle,

• .3 injection pump,

• .4 fuel cam,

• .5 injection pressure for common-rail systems,

• .6 combustion chamber,

• .7 compression ratio,

• .8 turbocharger type and build,

• .9 charge air cooler, charge air pre-heater,

• .10 valve timing,

• .11 NO_x abatement equipment "water injection",

• .12 NO_x abatement equipment "emulsified fuel" (fuel/water emulsion),

• .13 NO_x abatement equipment "exhaust gas recirculation",

• .14 NO_x abatement equipment "selective catalytic reduction", or

• .15 other parameter(s) specified by the Administration.

  6.2.3.4.2 The actual technical file of an engine may, based on the recommendations of the engine manufacturer and the approval of the Administration, include less components and/or parameters than discussed above depending on the particular engine and the specific design.

 For some parameters, different survey possibilities exist. Approved by the Administration, the ship operator, supported by the engine manufacturer, may choose what method is applicable. Any one of, or a combination of, the methods listed in appendix 7 of this Code may be sufficient to show compliance.

 Technical documentation for inclusion in an engine's technical file shall include details of modification and their influence on NO_x emissions, and it shall be supplied at the time when modifications are carried out. Test-bed data obtained from a later engine, which is within the applicable range of the engine group concept, may be accepted.

 An engine's technical file shall contain all applicable information, relevant to the NO_x emission performance of the engine, on the designated engine's components, adjustable features and parameters at the time of the engine's pre-certification (EIAPP Certificate) or initial certification (IAPP Certificate), whichever occurred first.