ISO 3895:1979

International Standard @ 3895
INTERNATIONAL ORGANIZATION FOR STANOARDIZATION*MEXYHAPOLIHAR OPrAHMBAUMR no CTAHLlAPTM3AUMM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Road vehicles - Screened and waterproof spark
plug and
its connection - Type 2
Véhicules routiers - Bougie d’allumage blindée et étanche et sa connexion - Type 2
Second edition - 1979-12-15
1 UDC 621.43.045 Ref. No. IS0 3895-1979 (E)
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Descriptors : road vehicles, ignition systems, spark plugs, spark ignition engines, electric connections, dimensions, dimensional tolerances
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Price based on 3 pages

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FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 member bodies). The work of developing
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up 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.
Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 3895 was developed by Technical Committee
iSO/TC 22, Road vehicles, and was circulated to the member bodies in December
1978.
It has been approved by the member bodies of the following countries
Australia Italy South Africa, Rep. of
Austria Japan Spain
P. Rep. of Sweden
Belgium Korea, Dem.
Bulgaria Korea, Rep. of Switzerland
Libyan Arab Jamahiriya Turkey
Chile
Czechoslovakia Mexico United Kingdom
France Netherlands USA
New Zealand Yugoslavia
Germany, F.R.
Ireland Romania
No member body expressed disapproval of the document.
This second edition cancels and replaces the first edition (i.e. IS0 3895-1976).
@ International Organization for Standardization, 1979 0
Printed in Switzerland

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INTERNATIONAL STANDARD IS0 3895-1979 (E)
Road vehicles - Screened and waterproof spark plug and
its connection - Type 2
1 SCOPE
4.1.2 Gasket
This International Standard specifies the essential dimen- When the spark plugs have been tightened with a torque of
sional characteristics of a spark plug type used with spark 48 Nam (threads clean, smooth and dry), the gasket thick-
ignition engines. ness shall correspond with dimension C in the table
in 4.1.1. If the gaskets are of a different thickness, a corres-
ponding adjustment to dimension A shall be made.
0 2 FIELD OF APPLICATION
4.1.3 Thread
The provisions of this International Standard apply to
screened and waterproof spark plugs and their connections,
type 2. 4.1.3.1 DIMENSION LIMITS
3 REFERENCES
Plug thread Tapped hole in
IS0 68, IS0 general purpose screw threads - Basic profile. Dimension (on finished plug) cylinder head
6e 6H
I .
IS0 261, IS0 general purpose metric screw threads -
max. 17.933 not specified
General plan.
IS0 96511, IS0 general purpose metric screw threads -
max.
16,959 17,216
Tolerances - Part 1 : Principles and basic data. Pitch diameter
min.
16,819 17.026
A
IS0 96513, IS0 general purpose metric screw threads -
max .
16,092 16,676
Minor diameter
Tolerances - Part 3 : Deviations for constructional threads.
min.
15,845 16,376
IS0 3412, Road vehicles - Screened and waterproof spark
With a root radius > 0,150 mrn (0.1 Pl.
1.
plug and its connection - Type
IS0 3896, Road vehicles - Screened and waterproof spark
4.1.3.2 TOLERANCE CLASSES
@
plug and its connection - Type 3.1 )
The tolerance classes of thread MI8 x 1.5 of finished spark
plugs and of the corresponding tapped holes in the cylinder
4 REQUIRED CHARACTERISTICS FOR THE SPARK
head are as follows :
PLUG AND THE HOUSING IN THE CYLINDER HEAD
- 6e for spark plugs (see note 2);
4.1 Dimensions and thread (see figure)
- 6H for tapped holes in the cylinder head.
4.1 .I Plug reach and installed heigh t
NOTES
1 The threads M18 X 1.5 of the spark plugs and the correspondi
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