ISO 19724:2016

INTERNATIONAL ISO
STANDARD 19724
First edition
2016-11-15
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 19724:2016(E)
©
ISO 2016

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ISO 19724:2016(E)

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ISO 19724:2016(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Procedures . 2
4.1 General . 2
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 . 4
4.6 High pressure pipe . 4
4.7 High pressure sensor . 4
5 Analysis of particles . 4
6 Reporting of results . 4
Bibliography . 5
© ISO 2016 – All rights reserved iii

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ISO 19724:2016(E)

Foreword
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The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 34, Vehicle
propulsion, powertrain and powertrain fluids.
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ISO 19724:2016(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, pipe-work, 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.
© ISO 2016 –
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