BS-ISO-19812-2006.pdf

BRITISH STANDARD BS ISO 19812:2006 Road vehicles M10 × 1 compact spark-plugs with flat seating and 16 mm hexagon and their cylinder head housings ICS 43.060.50 ? Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO 19812:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2007 © BSI 2007 ISBN 978 0 580 50232 3 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 19812:2006. The UK participation in its preparation was entrusted to Technical Committee MCE/9, Ignition equipment for spark ignition engines. A list of organizations represented on MCE/9 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO 19812:2006(E) INTERNATIONAL STANDARD ISO 19812 First edition 2006-11-15 Road vehicles M10 × × 1 compact spark-plugs with flat seating and 16 mm hexagon and their cylinder head housings Véhicules routiers Bougies d'allumage M10 × 1 «compactes» à siège plat et à hexagone de 16 mm et leurs logements dans la culasse BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iii 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 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 Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. 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 the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 19812 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 1, Ignition equipment. BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Road vehicles M10 × × 1 compact spark-plugs with flat seating and 16 mm hexagon and their cylinder head housings 1 Scope This International Standard specifies characteristics of M10 × 1 compact spark-plugs with flat seating and 16 mm hexagon, and of their cylinder head housing, for use with spark-ignition engines. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 68-1, ISO general purpose screw threads Basic profile Part 1: Metric screw threads ISO 261, ISO general purpose metric screw threads General plan ISO 965-1, 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: Deviations for constructional screw threads ISO 14508, Road vehicles Spark-plugs Terminals 3 Terminals The spark-plug terminal may be either the solid post or the threaded type as described 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 Figures 1 and 2). 4 Dimensions and threads 4.1 Spark-plug reach Spark-plug reach shall be according to Table 1. BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 Table 1 Spark-plug reach Dimensions in millimetres Type of reach A ± 0,2 B max. Y 0,3 0,8 + Short 9,5 16 9 Normal 12,7 19 11,7 4.2 Gasket When the spark-plugs have been tightened with a torque of 15 N m, 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 corresponding adjustment to dimensions A, B and Y shall be made. Non-captive gaskets may be used in special cases. 4.3 Threads for spark-plugs and cylinder heads 4.3.1 General The threads of M10 ¥ 1 spark-plugs and the corresponding 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 their tolerance classes are specified in 4.3.2 and 4.3.3 respectively. 4.3.2 Limiting dimensions The limiting dimensions are given in Table 2. Table 2 Limiting dimensions Dimensions in millimetres Dimension Plug thread (on finished plug) Tapped hole in cylinder head max. 9,974 Not specified Major diameter min. 9,794 10 max. 9,324 9,50 Pitch diameter min. 9,212 9,35 max. 8,747 9,153 Minor diameter min. 8,563 a 8,917 a With a root radius W 0,1 mm (0,1 P). BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 4.3.3 Tolerance classes The thread tolerance classes of finished M10 × 1 compact spark-plugs and of the corresponding tapped holes in the cylinder head are: 6g for spark-plugs (see Note 1); 6H for tapped holes in the cylinder head. NOTE 1 In 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 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 965-1:1998, Clause 11, according to the formula given below: Minor diameter, maximum = d1 es 2(H/4 H/6) = (8,917 0,026 0,144) mm = (8,917 0,170) mm = 8,747 mm The value for the basic profile remains the same as for the ISO thread (8,917 0,026) mm = 8,891 mm. NOTE 2 The initial clearance e = 0,026 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 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. 5 Other dimensions of spark-plugs and their cylinder head housings The other dimensions shall be as indicated in Figures 1 to 5. The contour of the insulator is optional; however, between the reference planes defined for spark-plugs with solid post terminal and ribbed insulator by the dimensions 17 mm and 21 mm, and for spark-plugs with threaded terminal and ribbed insulator by the dimensions 15,5 mm and 19,5 mm, its largest diameter shall be 10,5 mm ± 0,3 mm. The number and shape of ribs is optional. The length of the cylinder head housing Z 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 specified torque. Details not specified are left to the manufacturers choice. BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 4 Dimensions in millimetres Key 1 solid post terminal (ISO 14508) 2 captive gasket 3 pitch diameter a See Clause 4. b Dimension B is the maximum protrusion of any part of the spark-plug into the combustion chamber, measured from the spark-plug seat, not including the gasket. c Dimension after spark-plug has been tightened with a torque of 15 N m. Figure 1 M10 × × 1 spark-plug with solid post terminal (preferred design with non-ribbed insulator) BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 Dimensions in millimetres Key 1 solid post terminal (ISO 14508) 2 captive gasket Figure 2 M10 × × 1 spark-plug with solid post terminal (traditional design with ribbed insulator) Dimensions in millimetres Key 1 threaded terminal (ISO 14508) 2 captive gasket 3 pitch diameter a See Clause 4. b Dimension B is the maximum protrusion of any part of the spark-plug into the combustion chamber, measured from the spark-plug seat, not including the gasket. c Dimension after spark-plug has been tightened with a torque of 15 N m. Figure 3 M10 × × 1 spark-plug with threaded terminal (preferred design with non-ribbed insulator) BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 6 Dimensions in millimetres Key 1 threaded terminal (ISO 14508) 2 captive gasket Figure 4 M10 × × 1 spark-plug with threaded terminal (traditional design with ribbed insulator) Dimensions in millimetres a See Clause 5. Figure 5 Cylinder head housing BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 7 6 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 overstressing. Spark-plugs shall be tightened with a torque of 10 N m to 15 N m in aluminium alloy and cast iron cylinder heads. Engine manufacturers may specify a different torque for the first spark-plug installation. BS ISO 19812:2006 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 08:37:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO 19812:2006 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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