BRITISH STANDARD AUTOMOBILE SERIES BS AU 264 1995 ISO 2345 1994 Road vehicles — M18 × 1 ,5 spark plugs with conical seating and their cylinder head housing ICS 43 060 50 L ic e n s e d C o p y L o n d[.]
Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BRITIS H S TAND ARD AUTO MO BILE S E RIE S BS AU 64 : 995 IS O : 994 Road vehicles — M1 × ,5 spark-plugs with conical seating and their cylinder head housing IC S 43 60 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 264:1995 Committees responsible for this British Standard The p rep aration of this Britis h S tandard was entrus ted to Technical C ommittee MC E /9, Ignition equip ment for sp ark ignition engines , up on which the following b odies were rep res ented: S ociety of Motor Manufacturers and Traders Ltd C oop ted memb ers This Britis h S tandard, having b een p rep ared under the direction of the E ngineering S ector Board, was p ub lis hed under the authority of the S tandards Board and comes into effect on Amendments issued since publication D ecemb er 9 Amd No © BS I 1 - 9 The following BS I references relate to the work on this s tandard: C om mittee reference MC E /9 D raft for comment /71 401 D C ISBN 580 24944 D ate C omments Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 264:1995 Contents Page C ommittees res p ons ib le National foreword ii S cop e Normative references Requirements Figure — M1 × , sp ark- p lugs with conical s eating Figure — H ous ing of sp ark- p lug in cylinder head Tab le 1 Lis t of references © BS I 1 - 99 Ins ide front cover Ins ide b ack cover i Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 264:1 995 National foreword This British Standard has been prepared by Technical Committee MCE/9 It is identical with ISO 2345: 994 Road v ehicles — M1 × , sp ark- p lugs w ith co nical , published by the International seating and their cylinder head hous ing Organization for Standardization (ISO) Cross-references Publication referred to ISO 68: 973 ISO 261 : 973 ISO 965- : 980 ISO 965- 3: 980 C orresponding British Standard BS 3643 Part : 981 ISO m etric screw threads Princip les and b asic data (Technically equivalent) A British Standard does not purport to 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 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to 4, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 1 - 999 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 64 : 995 The Z length of the spark- plug housing in the S cop e This International Standard specifies the main characteristics of M1 × , spark- plugs with conical seating and their cylinder head housing, for use with spark- ignition engines cylinder head shall be sufficient to ensure that the end of the spark- plug thread does not proj ect into the combustion chamber at any point when the spark- plug is tightened to the maximum torque specified in 3.4 Threads Normative re fe re nce s 3.2.3 The following standards contain provisions which, 3.2.3.1 through reference in this text, constitute provisions The threads of M1 of this International Standard At the time of corresponding tapped holes in the cylinder head Spark-plug and cylinder head × , spark- plugs and the publication, the editions indicated were valid All shall conform to ISO 68, ISO 261 , ISO 965- and standards are subj ect to revision, and parties to ISO 965- Their limiting dimensions and their agreements based on this International Standard tolerance classes shall be as specified in are encouraged to investigate the possibility of and applying the most recent editions of the standards indicated below Members of IEC and ISO maintain registers of currently valid International Standards ISO 68: 973, ISO general purpose screw threads — 3.2.3.1 3.2.3.1 Limiting dimensions The limiting dimensions shall be as given in Table Tab le Basic profile Dimensions in millimetres ISO 261 : 973, ISO general purpose metric screw threads — General plan ISO 965- : 980, ISO general purpose metric screw D i me nsio n threads — Tolerances — Part : Principles and basic data ISO 965- 3: 980, ISO general purpose metric screw Maj or diameter threads — Tolerances — Part 3: Deviations for constructional threads Pitch diameter Require me nts Minor diameter Te rminals The spark- plug terminal may be either the solid post or the threaded type A spark- plug with threaded terminal on which a nut is applied shall respect the dimensions specified for spark- plugs with solid post terminal See Figure D ime nsions and thre ad s See Figure and Figure 3.2.1 3.2.3.1 respectively Length dimensions a With a root radius 3.2.3.1 Plu g thre ad Tap p e d ho le (on finished i n cyli nd e r plug) he ad max 7, 933 not specified 7, 697 18 max 6, 959 7, 21 6, 81 7, 026 max 6, 092 5, 845 6, 676 a 6, 376 W 0, 50 mm (0, P) Tolerance classes The tolerance classes of thread M1 × , of finished spark- plugs and of the corresponding tapped holes in the cylinder head shall be as follows: — 6e for spark- plugs (see note ); — 6H for tapped holes in the cylinder head The length dimensions are measured from a NOTE gauging plane defined by diameter mm on the International Standard can be fitted in existing heads also in seating Dimension 0, mm ± 0, mm may be increased for certain spark- plug types 3.2.2 Dimensions of spark-plug housing in cylinder head The length dimensions Z and mm max in the In order that spark- plugs complying with this 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 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- : 980, clause 11, according to the formula given below: Minor diameter, maximum = d1 – es – 2(H/4 – H/6) cylinder head are measured from a gauging plane defined by diameter mm on the seating = 6, 376 – 0, 067 – 0, 21 = 6, 376 – 0, 284 = 6, 092 The value for the basic profile remains the same as for the ISO thread (1 6, 376 – 0, 067 = 6, 309) © BSI 1 - 999 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 264:1 995 NO TE The initial clearance e = 0, 067 mm between the pitch diameters of the thread and of the tapped hole is intended to p revent the possibility of seizure, as a result of combustion deposits on the bare threads, when removing the spark- plugs The contour of the insulator is optional; however, between the reference planes defined for spark- plugs with solid post terminal by the This clearance is also intended to enable spark- plugs with dimensions mm and 3 mm, and for spark- plugs threads in accordance with this International Standard to b e with threaded terminal b y the dimensions mm fitted in existing tapped holes 3.2.3.2 Threaded terminal and 30 mm, its largest diameter shall be , mm ± 0, mm For spark- plugs with a threaded- type terminal, the D etails not specified are left to the manufacturer’s thread tolerance class of the terminal choice [see Figure b) ] is 6e NO TE D epending on manufacturing processes, class 7e is acceptab le on the finished product Nuts for use with threaded terminals shall have internal threads to 6H tolerance prior to assemb ly on the threaded post 3.4 Installation tightening torque The installation torque values apply to new spark- plugs without lub ricant on the threads If threads are lubricated, the torque value shall be reduced b y approximately one- third to avoid overstressing The spark- plugs shall be tightened 3.3 Other dimensions of spark-plug and housing in cylinder head with a torque of N·m to 30 N·m in cast iron cylinder heads The other dimensions shall be as indicated in NO TE Figure and Figure for the first spark- plug installation E ngine manufacturers may specify a different torque © BSI 1 - 999 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 64: 995 ) Spark- plug manufacturers are encouraged to adopt ° ± ° for future products ) 0, mm pitch complying with ISO 68 and ISO 61 3) D epending on manufacturing processes, class 7e is acceptable on the finished product 4) Length of usable thread 5) Cylindrical part 6) O ther dimensions: see Figure a) Figure — M1 © BSI 1 - 999 × ,5 spark-p lugs with conical se ating Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 264:1 995 Figure — Housing of spark-plug in cylinder head © BSI 1 - 999 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI List of references See national foreword © BSI 1 - 999 BS AU 264:1995 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 02: 08: 43 G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 264:1995 ISO 2345:1994 BSI — British Standards Institution BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are up dated b y amendment or revis ion Us ers of Britis h S tandards should make s ure that they p oss es s the latest amendments or editions It is the constant aim of BS I to imp rove the quality of our p roducts and services We would b e grateful if anyone finding an inaccuracy or amb iguity while us ing this Britis h S tandard would inform the S ecretary of the technical committee res p ons ib le, the identity of which can b e found on the inside front cover Tel: 02 89 96 90 00 Fax: 02 89 96 40 BS I offers memb ers an individual up dating s ervice called PLUS which ens ures that s ub s crib ers automatically receive the lates t editions of s tandards Buying standards O rders for all BS I, international and foreign s tandards p ub lications s hould b e addres s ed to C us tomer S ervices Tel: 899 00 Fax: 899 7001 In res p ons e to orders for international standards , it is BS I p olicy to sup p ly the BS I imp lementation of thos e that have b een p ub lis hed as Britis h S tandards, unless otherwis e requested Information on standards BS I p rovides a wide range of information on national, E urop ean and international standards through its Lib rary and its Technical H elp to E xp orters S ervice Various BS I electronic information s ervices are also availab le which give details on all its p roducts and s ervices C ontact the Information C entre Tel: 02 89 96 71 1 Fax: 02 89 96 048 S ub s crib ing memb ers of BS I are kep t up to date with s tandards develop ments and receive sub s tantial discounts on the p urchase p rice of s tandards For details of thes e and other b enefits contact Memb ership Adminis tration Tel: 02 89 96 70 02 Fax: 02 89 96 00 Copyright C op yright s ub s is ts in all BS I p ub lications BS I als o holds the cop yright, in the UK, of the p ub lications of the international s tandardization b odies E xcep t as p ermitted under the C op yright, D es igns and Patents Act 988 no extract may b e rep roduced, s tored in a retrieval s ystem or transmitted in any form or b y any means – electronic, p hotocop ying, recording or otherwis e – without p rior written p ermis s ion from BS I This does not p reclude the free us e, in the cours e of imp lementing the standard, of necess ary details such as s ymb ols, and size, typ e or grade designations If thes e details are to b e used for any other p urp os e than imp lementation then the p rior written p ermiss ion of BS I must b e ob tained If p ermis sion is granted, the terms may include royalty p ayments or a licensing agreement D etails and advice can b e ob tained from the C op yright Manager BS I 89 C his wick H igh Road London W4 4AL Tel: 02 89 96 70