ISO INTERNATIONAL 7440-1 STANDARD Second edition 1991-12-01 Road vehicles - Fuel injection equipment testing Part 1: Calibrating nozzle and holder assemblies Vehicules routiers --- Essai des équipements d'injection de combustible Partie 1: Ensembles porte-injecteur et injecteur de calibration Reference number ISO 7440-1:1991(E) ed without license from IHS Not for Resale 1SO 7440-1:1991(E) Foreword IsO (the International Organization for Standardization) is a woridwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technicat committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern. mental and non-governmental, in liaison with Iso, also take part in the work. Iso collaborates closely with the International Electrotechnica! Commission (lEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting.a vote. International Standard 1so 7440-1 was prepared by Technical Committee fllters for use.on road vehicles. This second edition cancels and replaces the first edition (Iso 7440-1:1985), of which 3.2.3 and figures 5 and 6 have been technically revised; clause 5 and table 1 (1985 edition) have been deleted. Iso 7440 consists of the following parts, under the general title Road vehicles --- Fuel injection equipment testing: - Part 1: Calibrating nozzle and holder assemblies - Part 2: Orifice plate flow-measurement Setting and maintenance requirements for fuel injection equipment are specified in IsO 4008-3:1987, Road vehicles -- Fuel injection pump testing -- Part 3: Application and test procedures. Annex A of this part of iso 7440 is for information onty. C ISO1991 or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publlsher. International Organizatlon for Standardization Case Postale 56: CH-1211 Geneve 20: Switzerland Printed in Switzeriand ternational Organization for Standardization Not for Resale ISO 7440-1:1991(E) Introduction The calibrating nozzle and holder assemblies are intended to simulate closely the function of the nozzle and holder assemblies in the fuel in- jection system of a compression-ignition (diesel) engine. They are flow gauges and require careful handling and maintenance. The manufacturer of the injection equipment and/or the manufacturer of the engine will need to specify the type of calibrating nozzle and holder assembly, the appropriate single hole orifice plate size or pintle nozzle (as applicable), high pressure pipes, exact limits, etc. to be used. ii ited without license from IHS No reproductic Not for Resale