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1、A Reference number ISO 2704:1998(E) INTERNATIONAL STANDARD ISO 2704 Fifth edition 1998-07-01 Road vehicles M10 1 spark-plugs with flat seating and their cylinder head housings Vhicules routiers Bougies dallumage M10 1 sige plat et leurs logements dans la culasse Copyright International Organization
2、for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2704:1998(E) ISO 1998 All rights reserved. Unless otherwise specified, no part o
3、f 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 Internetisoiso.c
4、h 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 body intereste
5、d 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 Co
6、mmission (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 vote. Intern
7、ational Standard ISO 2704 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 1, Ignition equipment. This fifth edition cancels and replaces the fourth edition (ISO 2704:1993), of which it constitutes a technical revision. Copyright International Organization for Standardiz
8、ation Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:09 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 2704:1998(E) 1 Road vehicles M10 1 spark-plugs with flat seating and
9、 their cylinder head housings 1 Scope This International Standard specifies the main characteristics of M10 1 spark-plugs with flat seating with normal or long reach and their cylinder head housings, for use with spark-ignition engines. 2 Normative references The following standards contain provisio
10、ns 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, and parties to agreements based on this International Standard are encouraged to investigate the possi
11、bility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 68-1:1), ISO general-purpose screw threads Basic profile Part 1: Metric screw threads. ISO 261: 2), ISO general-purpose metric screw
12、 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: Deviations for constructional threads. ISO 14508:1997, Road vehicles Spark-plugs Terminals. 3 Requir
13、ements 3.1 Terminals The spark-plug terminal shall 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 dimensions specified for spark-plugs with solid post terminals (see figure 1). 1) To be publishe
14、d. (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 of ISO 965-3:1980) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standa
15、rds 1/9972545001 Not for Resale, 04/24/2007 22:30:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2704:1998(E) ISO 2 3.2 Dimensions and threads (see figures 1 to 3) 3.2.1 Spark-plug reach Spark-plug reach shall be in accordance with table 1. Table 1 Dimensions in mil
16、limetres Type of reach A 0,2 B max. Y 0,3 Normal reach12,71911,7 Long reach192718 3.2.2 Gasket When the spark-plugs have been tightened with a torque of 15 Nm, on threads that are clean, smooth and dry, the gaskets shall be 1 mm to 1,6 mm thick. If the gasket thicknesses are different, a correspondi
17、ng adjustment to dimensions A, B and Y shall be made. Non-captive gaskets may be used in special cases. 3.2.3 Threads for spark-plugs and cylinder heads 3.2.3.1 General requirements The threads of M10 1 spark-plugs and the corresponding tapped holes in the cylinder head shall be in accordance with I
18、SO 68-1, ISO 261, ISO 965-1 and ISO 965-3. Their limiting dimensions and their tolerance classes are specified in 3.2.3.2 and 3.2.3.3 respectively. 3.2.3.2 Limiting dimensions The limiting dimensions are given in table 2. Table 2 Dimensions in millimetres Dimension Plug thread (on finished plug) Tap
19、ped hole in cylinder head Major diametermax.9,974not specified min.9,79410 Pitch diametermax.9,3249,5 min.9,2129,35 Minor diametermax.8,7479,153 min.8,5631)8,917 1) With a root radius 0,1 mm (0,1 P). Copyright International Organization for Standardization Provided by IHS under license with ISO Lice
20、nsee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO ISO 2704:1998(E) 3 3.2.3.3 Tolerance classes The thread tolerance classes of finished M10 1 spark-plugs and of the corresponding tapped holes i
21、n the cylinder head shall be as follows: 6g for spark-plugs (see note 1); 6H for tapped holes in the cylinder head. NOTES 1 In order that spark-plugs complying with this International Standard can be fitted in existing cylinder heads even in extreme cases, the value for the maximum truncation of the
22、 minor diameter of the spark-plug base has been slightly reduced with respect to the ISO 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
23、below: Minor diameter, maximum = d1 es 2(H/4 H/6) = 8,917 0,026 0,144 = 8,917 0,170 = 8,747 The value for the basic profile remains the same as for the ISO thread (8,917 0,026 = 8,891). 2 The initial clearance e = 0,026 mm between the pitch diameters of the thread and of the tapped hole is intended
24、to prevent the possibility of seizure, as a result of combustion deposits on the 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
25、of spark-plugs and their cylinder head housings The other dimensions shall be as indicated in figures 1 to 4 Dimensions 52,5 mm on spark-plugs with solid post terminal and 49,5 mm on spark-plugs with threaded terminal shall be measured when the spark-plugs have been tightened according to 3.2.2. The
26、 contour of the insulator is optional; however, between the reference planes defined for spark-plugs with solid post terminals by the dimensions 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 Z length
27、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 gasket is tightened to maximum compression. Details not specified are left to the manufacturers choice. 3.4 Installat
28、ion 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 overstressing. Spark-plugs shall be tightened with a torque of 10 Nm to 15 Nm in aluminium
29、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 Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:3
30、0:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 2704:1998(E) ISO 4 Dimensions in millimetres a) with solid post terminal b) with threaded terminal3) 1)For normal reach spark-plugs a maximum height without gasket is allowed of 61 mm for spark-plugs with solid post t
31、erminal; 58 mm for spark-plugs with threaded terminal. 2)For normal reach spark-plugs the coaxiality tolerance and the dimensions 31 mm minimum for spark-plugs with threaded terminal and 34 mm minimum for spark-plugs with solid post terminal do not apply. 3)For dimensions not shown see figure 1 a).
32、Key 1Solid post terminal in accordance with ISO 145083Pitch diameter 2Captive gasket4Threaded terminal in accordance with ISO 14508 Figure 1 M10 1 spark-plugs with flat seating and full thread Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NA
33、SA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:30:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO ISO 2704:1998(E) 5 Dimensions in millimetres NOTE For dimensions not shown, see figure 1 a). Figure 2 M10 1 spark-plug with flat seating and half thre
34、ad Dimensions in millimetres Figure 3 Housing of spark-plug with full thread in 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 22:30:09 MDTNo reproduction or netwo
35、rking permitted without license from IHS -,-,- ISO 2704:1998(E) ISO 6 Dimensions in millimetres Figure 4 Housing of spark-plug with half thread in cylinder head Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545
36、001 Not for Resale, 04/24/2007 22:30:09 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 Resale, 04/24/2007 22:30:09 MDTNo r
37、eproduction or networking permitted without license from IHS -,-,- ISO 2704:1998(E) ISO ICS 43.060.50 Descriptors: road vehicles, internal combustion engines, controlled ignition engines, ignition systems (engines), spark plugs, housings, specifications, dimensions. 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 22:30:09 MDTNo reproduction or networking permitted without license from IHS -,-,-