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1、A Reference number ISO 2344:1998(E) INTERNATIONAL STANDARD ISO 2344 Seventh edition 1998-11-01 Road vehicles M14 1,25 spark-plugs with conical seating and their cylinder head housings Vhicules routiers Bougies dallumage M14 1,25 sige conique et leurs logements dans la culasse Copyright International
2、 Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2344:1998(E) ISO 1998 All rights reserved. Unless otherwise specif
3、ied, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland In
4、ternetisoiso.ch Printed in Switzerland ii 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
5、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 Electr
6、otechnical Commission (IEC) on all matters of electrotechnical standardization. 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
7、 vote. International Standard ISO 2344 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 1, Ignition equipment. This seventh edition cancels and replaces the sixth edition (ISO 2344:1992), which has been technically revised. Annex A forms an integral part of this Internat
8、ional Standard. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 2
9、344:1998(E) 1 Road vehicles M14 1,25 spark-plugs with conical seating and their cylinder head housings 1 Scope This International Standard specifies the main characteristics of M14 1,25 spark-plugs with conical seating with normal reach, long reach and extra long reach and their cylinder head housin
10、gs, for use with spark-ignition engines. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision
11、, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 68-1:1), ISO general purpose sc
12、rew threads Basic profile Part 1: Metric screw threads. ISO 261:2), ISO general purpose metric screw threads General plan. ISO 965-1:3), ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data. ISO 965-3:4), ISO general purpose metric screw threads Tolerances Part 3: De
13、viations for constructional threads. ISO 14508:1997, Road vehicles Spark-plugs Terminals. 3 Requirements 3.1 Terminals The spark-plug terminal may be either the solid post or the threaded type as specified in ISO 14508. A spark-plug with threaded terminal on which a nut is applied shall respect the
14、dimensions specified for spark-plugs with solid post terminals (see figure 1). 3.2 Dimensions and threads See figures 1 and 2. 1) To be published. (Revision of ISO 68:1973) 2) To be published. (Revision of ISO 261:1973) 3) To be published. (Revision of ISO 965-1:1980) 4) To be published. (Revision o
15、f ISO 965-3:1980) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2344:1998(E) ISO 2 3.2.1
16、Length dimensions The length dimensions are measured from a gauging plane defined by diameter 14,8 mm on the seating. 3.2.2 Spark-plug reach Spark-plug reach shall be in accordance with table 1. Table 1 Dimensions in millimetres Type of reachA 0,3 B max. Y 0,3 Normal reach11,21910,2 Long reach17,525
17、16,5 Extra long reach2532,524 3.2.3 Threads for spark-plugs and cylinder heads The threads of M14 1,25 spark-plugs and the corresponding tapped holes in the cylinder head shall conform to ISO 68, ISO 261, ISO 965-1 and ISO 965-3. Their limiting dimensions and their tolerance classes are specified in
18、 3.2.3.1 and 3.2.3.2 respectively. 3.2.3.1 Limiting dimensions The limiting dimensions shall be as given in table 2. Table 2 Dimensions in millimetres DimensionPlug thread (on finished plug) Tapped hole in cylinder head Major diametermax.13,937not specified min.13,72514,000 Pitch diametermax.13,1251
19、3,368 min.12,99313,188 Minor diametermax.12,40412,912 min.12,1811)12,647 1) With a root radius 0,125 mm (0,1 P) 3.2.3.2 Tolerance classes The thread tolerance classes of finished M14 1,25 spark-plugs and of the corresponding tapped holes in the cylinder head shall be as follows: 6e for spark-plugs (
20、see note 1); 6H for tapped holes in the cylinder head. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IH
21、S -,-,- ISOISO 2344:1998(E) 3 NOTES 1In order that spark-plugs complying with this International Standard can be fitted in existing cylinder heads also in extreme cases, the value for the maximum truncation of the minor diameter of the spark-plug base has been slightly reduced with respect to the IS
22、O value. This maximum value of the minor diameter is calculated from a distance of H/6 for the maximum truncation instead of the value given by the formula in ISO 965-1:, clause 11, according to the formula given below: Minor diameter, maximum = d1 es 2(H/4 - H/6) = 12,647 0,063 0,180 = 12,647 0,243
23、 = 12,404 The value for the basic profile remains the same as for the ISO thread (12,647 - 0,063 = 12,584). 2The initial clearance e = 0,063 mm between the pitch diameters of the thread and of the tapped hole is intended to prevent the possibility of seizure, as a result of combustion deposits on th
24、e bare threads, when removing the spark-plugs. This clearance is also intended to enable spark-plugs with threads in accordance with this International Standard to be fitted in existing tapped holes. 3.3 Other dimensions of spark-plugs and their cylinder head housings The other dimensions shall be i
25、n accordance with figures 1 and 2. An alternative cylinder head housing which allows both conical seat and flat seat spark-plugs is possible (see annex A). The contour of the insulator is optional; however, between the reference planes defined for spark-plugs with solid post terminals by the dimensi
26、ons 29 mm and 33 mm, and for spark-plugs with threaded terminals by the dimensions 26 mm and 30 mm, its largest diameter shall be 10,5 mm 0,3 mm. The length dimensions Z and 5,5 mm max. or Z and 3 mm max. in the cylinder head (see figure 2 and figure A.1, respectively) are measured from a gauging pl
27、ane defined by diameter 14,8 mm on the seating. The Z and Z length of the spark-plug housing in the cylinder head shall be sufficient to ensure that the end of the spark-plug thread does not project into the combustion chamber at any point when the spark-plug is tightened to its maximum specified to
28、rque. Details not specified are left to the manufacturers choice. 3.4 Installation tightening torque The installation torque values apply to new spark-plugs without lubricant on the threads. If threads are lubricated, the torque value shall be reduced by approximately one-third to avoid overstressin
29、g. Spark-plugs shall be tightened with a torque of 10 Nm to 20 Nm in aluminium and cast iron cylinder heads. NOTE Engine manufacturers may specify a different torque for the first spark-plug installation. Copyright International Organization for Standardization Provided by IHS under license with ISO
30、 Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2344:1998(E) ISO 4 Dimensions in millimetres a) with solid post terminal Dimensions in millimetres b) with threaded terminal3) Key 1ISO 14
31、508 solid post terminal 2Pitch diameter 3ISO 14508 threaded terminal 1) For normal reach spark-plugs the following maximum heights are allowed: 63 mm for spark-plugs with solid post terminal; 60 mm for spark-plugs with threaded terminal. 2) For normal reach spark-plugs the coaxiality tolerance and t
32、he dimensions 31 mm min. for spark-plugs with threaded terminal and 34 mm min. for spark-plugs with solid post terminal do not apply. 3) For other dimensions not shown, see figure 1a). Figure 1 M14 1,25 spark-plugs with conical seating Copyright International Organization for Standardization Provide
33、d by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 2344:1998(E) 5 Dimensions in millimetres Key 1Pitch diameter Figure 2 Housing of the spark-plug in the c
34、ylinder head Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2344:1998(E) ISO 6 Annex A (no
35、rmative) Alternative cylinder head housing The Z and Z length of the spark-plug housing in the cylinder head shall be sufficient to ensure that the end of the spark-plug thread does not project into the combustion chamber at any point when the spark-plug is tightened to its maximum specified torque.
36、 Dimensions in millimetres Key 1Pitch diameter Figure A.1 Counterbore combination for M14 1,25 spark-plugs with conical seating and for M14 1,25 spark-plugs with flat seating and 16 mm hexagon Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NA
37、SA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Res
38、ale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2344:1998(E) ISO ICS 43.060.50 Descriptors: road vehicles, internal combustion engines, controlled ignition engines, ignition systems, spark plugs, housings, specifications, dimensions, dimensional tolerances. Price based on 6 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:07 MDTNo reproduction or networking permitted without license from IHS -,-,-