IS 3170 : Part 1 : 2006 /ISO 2697 : 1999 Internal Combustion Engines - Fuel Injection Nozzles - Part 1 : Injection Nozzles - Size `S'

National Foreword

This Indian Standard ( Part 1 ) ( Second Revision ) which is identical with ISO 2697 : 1999 Diesel engines - Fuel nozzles - Size �S� issued by the International Organization for Standardization( ISO ) was adopted by the Bureau of Indian Standards on the recommendation of the Automotive Primemovers Transmission and Steering Systems and Internal Combustion Engines Sectional Committee and approval of the Transport Engineering Division Council.

In view of the emerging technological developments in the diesel engine manufacturing industry in the country and also with the growing concern over the acceptability of the engines and their components in the international market, it was decided toupgrade the contents of the standard that have a bearing on the quality of the engines to the international level. The adoption of International Standards by dual numbering system was considered as appropriate for the purpose and accordingly the corresponding International Standardshave been brought under the dual numbering system.

This standard was first published in 1965 and revised in 1997. The second revision of the standard has been undertaken due to revision of base standard and to bring it in line with dimensional requirements for certain category of injection nozzles used in diesel engines and their interchangeabilityin the corresponding nozzle holders followed internationally. During the revision, the committee had examined and considered the other International Standards relevant to the subject and agreed to bring them as parts of the standard to make them more useful for the industry.

The following technical changes have been incorporated:

a) Scope has been modified and restricted to size �S� fuel nozzles used in diesel engines.

b) Title has been modified:

1) Fuel injection nozzles to fuel nozzles.

2) Internal combustion engines to diesel engines.

c) Clause on normative references is elaborated.

d) Clause on field of application has been shifted under scope.

The text of the ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards.Attention is particularly drawn to the following:

a) Wherever the words �International Standard� appear referring 10 this standard, they should be read as �Indian Standard'.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practice is to use a point ( . ) as the decimal marker.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 �Rules for rounding off numerical values ( revised )�. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.