This Naval Engineering Standard (NES) details those characteristics of diesel engines and diesel systems which must be present in ships and submarines whenever this document is called up in a Procurement Specification (PS). It also provides general design guidance for other diesel and diesel equipment characteristics based on successful past practice as an aid to the designer and gives guidance on the information and assistance required of engine manufacturers to ensure achievement of appropriate standards.

This NES includes the following details:

The environmental conditions under which the engines must operate and remain effectively functional in the absence of detailed requirements being defined in the Statement of Technical Requirements (STR).

The `on-engine' parts of diesel engine service systems which historically have been supplied by the engine manufacturer.

Some key aspects of the air induction and exhaust gas systems that affect engine performance even though they are not part of the diesel engine unit.

This NES excludes details of the Contractor's responsibility for supplying all materials and components not contractually identified as Ministry Supplied Material (MSM) equipment or ancillary assemblies.