ISO 6550-4:2009

INTERNATIONAL ISO
STANDARD 6550-4
Second edition
2009-11-01

Road vehicles — Sheath-type glow-plugs
with conical seating and their cylinder
head housing —
Part 4:
M8 × 1 glow-plugs
Véhicules routiers — Bougies de préchauffage à fourreau et à siège
conique et leur logement dans la culasse —
Partie 4: Bougies M8 × 1




Reference number
ISO 6550-4:2009(E)
©
ISO 2009

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ISO 6550-4:2009(E)
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ii © ISO 2009 – All rights reserved

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ISO 6550-4:2009(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Dimensions and tolerances.1
3.1 General .1
3.2 Glow-plugs .1
3.3 Cylinder head housing.5
3.4 Threads.6
3.5 Dimension limits of threads M8 × 1 .6
4 Installation tightening torque.7
Annex A (informative) M8 × 1 glow-plugs with 10 mm hexagon and their cylinder head housing .8
Bibliography.10

© ISO 2009 – All rights reserved iii

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ISO 6550-4:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 6550-4 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 1, Ignition
equipment.
This second edition cancels and replaces the first edition (ISO 6550-4:2005), which has been technically
revised.
ISO 6550 consists of the following parts, under the general title Road vehicles — Sheath-type glow-plugs with
conical seating and their cylinder head housing:
⎯ Part 1: M14 × 1,25 glow-plugs
⎯ Part 2: M12 × 1,25 glow-plugs
⎯ Part 3: M10 glow-plugs
⎯ Part 4: M8 × 1 glow-plugs

iv © ISO 2009 – All rights reserved

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INTERNATIONAL STANDARD ISO 6550-4:2009(E)

Road vehicles — Sheath-type glow-plugs with conical seating
and their cylinder head housing —
Part 4:
M8 × 1 glow-plugs
1 Scope
This part of ISO 6550 specifies the main characteristics of M8 × 1 sheath-type glow-plugs with conical seating
and their cylinder head housing, for use with diesel (compression-ignition) engines.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
d
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