ISO INTERNATIONAL 5165 STANDARD Fifth edition 2020-07 Petroleum products Determination of the ignition quality of diesel fuels - Cetane engine method Produitspétroliers-Determination delaqualited'inflammabilite descarburantspourmoteursdieselMéthodecétane Reference number IS0 5165:2020(E) ISO @IS02020 IS0 5165:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS02020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's member body in the country of the requester. ISo copyright office CP 40i: Ch.de Blandonnet 8 CH-1214 Vernier,Geneva Phone: +4122749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2020 - All rights reserved IS05165:2020(E) Contents Page Foreword .V 1 Scope. 1 2 Normative references 1 3 Terms and definitions .2 4 Principle .3 5 Reagents and reference materials .4 6 Apparatus. 5 6.1 Test engine assembly 5 6.2 Instrumentation. 5 .7 6.3 Referencefuelsdispensing equipment .7 6.4 Injectornozzletester. 6.5 Special maintenancetools .8 7 Sampling and sample preparation .8 8 Basic engine and instrument settings and standard operating conditions .8 8.1 Installation of engine equipment and instrumentation. .8 8.2 Engine speed. 8 8.3 Valve timing .8 8.4 Valve lift. 9 8.5 Fuel pump timing. .9 8.6 Fuel pump inlet pressure .9 8.7 Direction of engine rotation 9 8.8 Injection timing .9 8.9 Injector nozzle opening pressure 9 8.10 Injectionflowrate .9 8.11 Injectorcoolantpassagetemperature. .9 8.12 Valve clearances 9 8.13 Oilpressure 9 8.14 Oil temperature .9 8.15 Cylinder jacket coolanttemperature 10 8.16 Intakeairtemperature 10 8.17 Basic ignition delay 10 8.18 Cylinder jacket coolantlevel. 10 8.19 Engine-crankcase lubricating oil level 10 8.20 Crankcase internal pressure. 10 8.21 Exhaust back-pressure 10 8.22 Exhaust and crankcase breather system resonance 10 8.23 Piston over-travel. 10 8.24 Belttension 10 8.25 Injector opening or releasepressure. 11 8.26 Injectorspraypattern 11 8.27 Indexing handwheel reading 11 8.27.1 General 11 8.27.2 Basicsettingofvariablecompressionplug 11 8.27.3 Setting handwheel micrometer drum and scale 11 8.27.4 Setting handwheel reading 11 Basic compression pressure. .12 8.28 8.29 Fuel pump lubricating oil level. 12 8.30 Fuel pump timing gear-box oil level 12 8.31 Setting instrumentation reference pickups .13 8.32 Setting injector pickup gap 13 9 Engine qualification .13 iii IS0 2020-All rights reserved IS05165:2020(E) 9.1 Engine conformity .13 9.2 Checking performance on check fuels .13 9.3 Check in the case of nonconformity. .13 10 Procedure. .14 10.1 General. .14 10.2 Sampleintroduction. .14 10.3 Fuelflowrate .14 10.4 Fuel injection timing ..14 10.5 Ignition delay. .14 10.6 Equilibration. ..14 10.7 Handwheel reading .14 10.8 Reference fuel no. 1 .14 10.9 Referencefuelno.2 .15 10.10 Number of blends of reference fuels ..16 10.11 Repeat readings .16 11 Calculation .16 12 Expressionofresults ..18 13 Precision. ..18 13.1 General ..18 13.2 Repeatability,r .18 13.3 Reproducibility, R .18 13.4 Precision basis. .18 14 Test report .19 Bibliography .20 iv @IS0 2020 - All rights reserved IS05165:2020(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (iso member bodies). The work of preparing International Standards is normally carried out through Iso technical 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, governmental and non-governmental, in liaison with Iso, also take part in the work Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document