1、BRITISH STANDARD BS ISO 2346:2001 Road vehicles M14 1,25 compact spark-plugs with flat seating and 19 mm hexagon and their cylinder head housing ICS 43.060.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 2346:2001 This British Standard, having been prepared under the
2、direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 6 March 2002 BSI 6 March 2002 ISBN 0 580 39044 6 National foreword This British Standard reproduces verbatim ISO 2346:2001 and implements it as the U
3、K national standard. The UK participation in its preparation was entrusted to Technical Committee MCE/9, Ignition equipment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards whic
4、h implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to
5、 include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/
6、European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title pag
7、e, pages ii and iii, a blank page, pages 1 to 6, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 2346:2001(E)INTERNATIONAL STANDARD IS
8、O 2346 Fifth edition 2001-12-15 Road vehicles M14 1,25 compact spark-plugs with flat seating and 19 mm hexagon and their cylinder head housing Vhicules routiers Bougies dallumage M14 1,25 compactes sige plat et hexagone de 19 mm et leur logement dans la culasse ISO 2346:2001(E) lcsid FDParemi ihTs P
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13、r ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC02 av leT. 14 + 10 947 22 11 xaF 90 947 22 14 + 74 E-mail cirypothgiso.ch Web ww.wiso.ch Prnietdni wS ztierland ii ISO 2346:2001(E) iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards
14、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 organizat
15、ions, 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 th
16、e ISO/IEC Directives, Part 3. 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
17、the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2346 was prepared by Technical Committee ISO/TC 2
18、2, Road vehicles, Subcommittee SC 1, Ignition equipment. This fifth edition cancels and replaces the fourth edition (ISO 2346:1991), which has been technically revised. INTERNATIONAL STANDARD ISO 2346:2001(E)1Road vehicles M14 1,25 compact spark-plugs with flat seating and 19 mm hexagon and their cy
19、linder head housing 1 Scope This International Standard specifies the main characteristics of M14 1,25 compact spark-plugs with flat seating and 19 mm hexagon and their cylinder head housing, for use with spark-ignition engines. 2 Normative references The following normative documents contain provis
20、ions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate
21、 the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 68-1, ISO general purp
22、ose screw threads Basic profile Part 1: Metric screw threads ISO 261, ISO general-purpose metric screw threads General plan ISO 965-1:1998, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data ISO 965-3, ISO general purpose metric screw threads Tolerances Part 3: Dev
23、iations for constructional screw threads ISO 14508:1997, Road vehicles Spark-plugs Terminals 3 Terminals The spark-plug terminal may be either of the solid post or threaded type as specified in ISO 14508. A spark-plug with a threaded terminal on which a nut is applied shall respect the dimensions sp
24、ecified for spark-plugs with solid post terminals (see Figure 1). 4 Dimensions and threads 4.1 General See Figures 1 and 2. 4.2 Gasket When the spark-plugs have been tightened with a torque of 30 Nm, on threads that are clean, smooth and dry, the gaskets shall be 1,3 mm to 2 mm thick. If the gasket
25、thicknesses are different, a corresponding adjustment to dimensions 9 mm 0,3 mm, 9,5 mm 0,2 mm and 16 mm max. shall be made. Non-captive gaskets may be used in special cases. ISO 2346:2001(E) 2 4.3 Threads for spark-plugs and cylinder heads 4.3.1 General The threads of M14 1,25 spark-plugs and the c
26、orresponding tapped holes in the cylinder head shall conform to ISO 68-1, ISO 261, ISO 965-1 and ISO 965-3. Their limiting dimensions and tolerance classes shall be as specified in 4.3.2 and 4.3.3, respectively. 4.3.2 Limiting dimensions The limiting dimensions are given in Table 1. Table 1 Limiting
27、 dimensions Dimensions in millimetres Dimension Plug thread (on the finished plug) Tapped hole in the cylinder head max. 13,937 Not specified Major diameter min. 13,725 14,000 max. 13,125 13,368 Pitch diameter min. 12,993 13,188 max. 12,404 12,912 Minor diameter min. 12,181 a12,647 aWith a root radi
28、us W 0,125 mm (0,1 P). 4.3.3 Tolerance classes The thread tolerance classes of finished M14 1,25 compact spark-plugs and of the corresponding tapped holes in the cylinder head are 6e for spark-plugs 1) , and 6H for tapped holes in the cylinder head. NOTE The initial clearance, e = 0,063 mm, between
29、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 the bare threads, when removing the spark-plugs. This clearance is also intended to enable spark-plugs with threads in accordance with this International
30、Standard to be fitted in existing tapped holes. 1) In order that spark-plugs complying with this International Standard may also be fitted in existing cylinder heads in extreme cases, the value for the maximum truncation of the minor diameter of the spark-plug base has been slightly reduced with res
31、pect 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 965-1:1980, clause 11, according to the formula: Minor diameter, maximum = d 1 es 2(H/4 H/6) = (12,647 0,063 0,180) mm = 12
32、,404 mm The value for the basic profile remains the same as for the ISO thread: (12,647 0,063) mm = 12,584 mm. ISO 2346:2001(E) 35 Other dimensions of spark-plugs and their cylinder head housings The other dimensions shall be as indicated in Figures 1 and 2. The contour of the insulator is optional;
33、 however, between the reference planes defined for spark-plugs with solid post terminals by the dimensions 20 mm and 24 mm, and for spark-plugs with threaded terminals by the dimensions 17 mm and 21 mm, its largest diameter shall be 12,2 mm 0,3 mm. The non-ribbed insulator design is preferred becaus
34、e it provides superior protection to dielectric tracking between the spark-plug insulator and the cover. The Z length of the cylinder head housing 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 tightene
35、d to maximum compression. Details not specified are left to the manufacturers choice. 6 Installation tightening torque The installation torque values are applicable to new spark-plugs without lubricant on the threads. If threads are lubricated, the torque value shall be reduced by approximately one-
36、third to avoid overstressing. Spark-plugs shall be tightened with a torque of 20 Nm to 30 Nm in aluminium cylinder heads, and 20 Nm to 40 Nm in cast iron cylinder heads. Engine manufacturers may specify a different torque for the first spark-plug installation. ISO 2346:2001(E) 4 Dimensions in millim
37、etres a) With solid post terminal Preferred design with non-ribbed insulator b) With solid post terminal Traditional design with ribbed insulator c Key 1 Solid post terminal ISO 14508 2 Captive gasket aSee clause 4. bThis dimension (16 mm max.) is the maximum protrusion of any part of the spark-plug
38、 into the combustion chamber, measured from the spark-plug seat, not including the gasket. cFor other dimensions not shown, see Figure 1 a). Figure 1 M14 1,25 compact spark-plug with flat seating ISO 2346:2001(E) 5c) With threaded terminal Preferred design with non-ribbed insulator cd) With threaded
39、 terminal Traditional design with ribbed insulator cKey 3 Threaded terminal ISO 14508 cFor other dimensions not shown, see Figure 1 a). Figure 1 M14 1,25 compact spark-plug with flat seating ISO 2346:2001(E) 6 Dimensions in millimetres aSee clause 5. Figure 2 Cylinder head housing BS ISO 2346:2001 B
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