ISO 19724:2020

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19724
ISO/TC 22/SC 34
Gasoline engines with direct
Secretariat: ANSI
injection — Cleanliness assessment of
Voting begins on:
2020­03­02 fuel injection equipment
Voting terminates on:
Moteurs à essence — Evaluation de propreté pour équipement
2020­04­27
d'injection de combustible
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 19724:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2020

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ISO/FDIS 19724:2020(E)

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© ISO 2020
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ii © ISO 2020 – All rights reserved

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ISO/FDIS 19724:2020(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Procedures . 1
4.1 General . 1
4.2 General test conditions . 2
4.3 High pressure pump . 2
4.3.1 Method A . 2
4.3.2 Method B . 3
4.4 Injector . 3
4.5 Rail . 3
4.6 High­pressure pipe (Table 5) . 4
4.7 High­pressure sensor (Table 6) . 4
5 Analysis of particles . 4
6 Reporting of the inspection results . 4
Annex A (informative) Comparison of CCC (Component Cleanliness Code, ISO 16232) to
FIECC (Fuel Injection Equipment Cleanliness Code, ISO 12345:2013) .5
Bibliography . 7
© ISO 2020 – All rights reserved iii

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ISO/FDIS 19724:2020(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 non­governmental, 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 and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,
Vehicle propulsion, powertrain and powertrain fluids.
This second edition cancels and replaces the first edition (ISO 19724:2016), of which it constitutes a
minor revision. The main changes compared to the previous edition are as follows:
— The reporting of the inspection results (Clause 6) changed from FIECC (Fuel Injection Equipment
Cleanliness Code, as in ISO 12345:2013) to CCC (Component Cleanliness Code, as in ISO 16232);
— The references to different parts of the ISO 16232 series have been modified to the newest edition:
ISO 16232:2018.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

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ISO/FDIS 19724:2020(E)

Introduction
Modern fuel injection systems contain many closely controlled clearances and rely on the fuel-flowing
characteristics of small orifices. Thus, they require the close control of sources of contamination in
order to maintain the operational performance demanded of them throughout their design life. To this
end, such systems are designed with integral fuel-filtration equipment, which reduces the amount of
potentially damaging debris that could enter the system from external sources.
However, contamination of the fuel injection system can also occur internally, from system use or
wear, from equipment servicing, or as a result of the original supplier’s manufacturing and assembly
processes. The focus of this document is on the latter source of contamination and is thus concerned
with the assessment of the cleanliness of the fuel injection equipment as originally supplied to the
engine manufacturer.
Fuel injection systems comprise a number of components. These are the low-pressure elements (fuel
tank, pipework, filters, lift pump, etc.), a high pressure fuel pump, a high-pressure pipe, a fuel rail with a
high pressure sensor and fuel injectors.
During the preparation of this document, the importance of care in the handling and measurement
of contamination samples was clearly recognized. Moreover, the low levels of contaminant with fuel
injection equipment make this a particularly difficult task. For this document to be used meaningfully
as an indicator of component cleanliness and a driver towards higher quality standards, extreme
attention to detail is required of the user. Verification requirements for the test equipment used are
therefore emphasized. Helpful standards for appropriate conditions and handling are given in the
bibliography.
It is not always clear what level of cleanliness is sufficient for rated performance and life time on a cost-
effective basis. The actual quantitative levels can only be set in relation to other parameters, agreed
between the manufacturer, supplier and user. This document provides a set of procedures for evaluating
the cleanliness of fuel injection equipment and a framework for a common measurement and repo
...