ISO 19724:2020

INTERNATIONAL ISO
STANDARD 19724
Second edition
2020-06
Gasoline engines with direct
injection — Cleanliness assessment of
fuel injection equipment
Moteurs à essence — Evaluation de propreté pour équipement
d'injection de combustible
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

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 High-pressure pipe (Table 5) . 4
4.7 High-pressure 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) to FIECC (Fuel
Injection Equipment Cleanliness Code) . 5
Bibliography . 7
Foreword
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
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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

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 reporting.
INTERNATIONAL STANDARD ISO 19724:2020(E)
Gasoline engines with direct injection — Cleanliness
assessment of fuel injection equipment
WARNING — Application of this document may involve the use of hazardous materials, operations
and equipment. This document does not purport to
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