ISO 11565:2024

International
Standard
ISO 11565
Third edition
Road vehicles — Spark-plugs — Test
2024-06
methods and requirements
Véhicules routiers — Bougies d'allumage — Méthodes d'essai et
exigences
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test methods and requirements . 1
4.1 General .1
4.2 General characteristics .2
4.2.1 Test . . .2
4.2.2 Requirements .2
4.3 Dimensions .2
4.3.1 Test . . .2
4.3.2 Requirement .3
4.4 Mechanical performance .3
4.4.1 Mechanical strength of the shell .3
4.4.2 Tear-off resistance of the high voltage terminal .3
4.4.3 Bending resistance .3
4.4.4 Vibration resistance .4
4.5 Gas tightness .4
4.5.1 General .4
4.5.2 Test . . .4
4.5.3 Requirement .6
4.6 Thermal shock, thermal resistance .6
4.6.1 General .6
4.6.2 Test . .6
4.6.3 Requirement .6
4.7 Electrical performance .7
4.7.1 Resistance of the incorporated element for electromagnetic interference (EMI)
suppression .7
4.7.2 Withstand voltage of the insulator .7
4.8 Loading life of the incorporated resistor .8
4.8.1 General .8
4.8.2 Test . .8
4.8.3 Requirement .8
Annex A (informative) Test device to test the bending resistance of the insulator.10
Bibliography .11

iii
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,
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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this may not represent the latest information, which may be obtained from the patent database available at
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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 32,
Electrical and electronic components and general system aspects.
This third edition cancels and replaces the second edition edition (ISO 11565:2006), which has been
technically revised. It also incorporates the Technical Corrigendum ISO 11565:2006/Cor. 1:2007.
The main changes are as follows:
— the test procedures have been divided into spark plugs for natural aspirated engines and boosted
engines;
— the test sequences have been modified.
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
International Standard ISO 11565:2024(en)
Road vehicles — Spark-plugs — Test methods and
requirements
1 Scope
This document specifies the test methods and requirements for the mechanical and electrical performance
of spark-plugs for use with spark ignition engines.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 6518-1, Road vehicles — Ignition systems — Part 1: Vocabulary
ISO 28741, Road vehicles — Spark-plugs and their cylinder head housings — Basic characteristics and dimensions
IEC 60068-2-6, Environmental Testing — Part 2-6: Tests — Test Fc: Vibration (sinusoidal)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6518-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Test methods and requirements
4.1 General
The tests shall be carried out at an ambient temperature of (20 ± 15) °C and a relative humidity of (65 ± 20) %
unless otherwise specified.
For each test sample in Table 1, the test sequence is indicated by "X" from top to bottom.
Each test sequence shall be started with unused samples.
“Type A” refers to normally aspirated engines and “Type B” refers to boosted engines.
Which type (A or B) to be applied for each test shall be agreed between the customer and the supplier.

Table 1 — Test sequences
In accord- Test sample
Characteristic to be checked ance with
A B C D E F
sub-clause
General characteristics (visual examination) 4.2 X X X X X X
Dimensions 4.3 X X X X X X
Resistance of the incorporated element for electromagnetic
4.7.1 X
interference (EMI) suppression
-
-
Loading life of the incorporated resistor 4.8 X
-
-
Mechanical strength of the shell 4.4.1 X
Tear off resistance of the high voltage terminal 4.4.2 X
Bending resistance 4.4.3 X
-
Gas tightness 4.5 X
Withstand voltage of the insulator 4.7.2 X
-
Vibration resistance 4.4.4 - - X
-
Gas tightness 4.5 X
Withstand voltage of the insulator 4.7.2 X
Thermal shock, thermal resistance 4.6 - X
General characteristics (visual examination) 4.2 X X X X
4.2 General characteristics
4.2.1 Test
Check the characteristics specified in 4.2.2 by visual examination. Carry out the visual examination using
the naked eye, at normal strength of vision and normal colour perception, at the most favourable viewing
distance and with suitable illumination.
The user shall be able to identify the item and verify its appearance, workmanship and finish against the
relevant specification based on a visual examination.
4.2.2 Requirements
4.2.2.1 The external gasket, if any, shall conform to ISO 28741 for the relevant spark plug.
4.2.2.2 The scavenging area shall be clean and without any foreign body.
4.2.2.3 The electrodes shall be fixed in position.
4.2.2.4 The shell shall be properly fixed to the insulator. There shall be no visible sign of corrosion. The
thread shall be free from burrs or damage.
4.2.2.5 The insulator shall be smooth and uniform without abnormal appearance. The insulator shall not
show chips, cracks or signs of shock damage.
4.2.2.6 The marking shall be as specified between customer and supplier.
4.3 Dimensions
4.3.1 Test
The dimensions shall be checked in accordance with ISO
...