3895 (ISO International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAH OPTAHW3AUMA IO CTAHAAPTW3AUWW+ORGANISATION INTERNATIONALE DE NORMALISATION Road vehicles - Screened and waterproof spark-plug and its connection -- Type 2 Vehicules routiers -- Bougie d'allumage blindee et étanche et sa connexion -- Type 2 Third edition - 1986-03-15 UDC 621.43.045 Ref. No. ISO 3895-1986 (E) 3895-1986 (E) Descriptors : road vehicles, internal combustion engines, controlled ignition engines, ignition systems, spark plugs, dimensions. 8 Price based on 3 pages right International Organization for Standardization Copyr Not for Resale 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, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at International Standard ISO 3895 was prepared by Technical Committee ISO/TC 22, Road vehicles. This third edition cancels and replaces the second edition (IS0 3895-1979), of which it constitutes a minor revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1986 ? Printed in Switzerland Copyright International Organizatin for Standardization Not for Resale I without license from IHS ISO 3895-1986 (E) INTERNATIONAL STANDARD Road vehicles -- Screened and waterproof spark-plug and its connection - Type 2 Scope 1 4.1.2 Gasket This Internationa! Standard specifies the essential dimensional When the spark-plugs have been tightened with a torque of characteristics of a spark-plug type used with spark ignition 48 N.m (threads clean, smooth and dry), the gasket thickness engines. shall correspond to dimension C in the table in 4.1.1. If the gaskets are of a different thickness, a corresponding adjust- ment to dimension A shall be made. 2 Field of application The requirements of this International Standard apply to 4.1.3 Thread screened and waterproof spark-plugs and their connections, type 2. 4.1.3.1 1 Dimension limits 3 Dimensions in millimetres References Plug thread Tapped hole in Iso 68, /sO general purpose screw threads -- Basic profile. Dimension (on finished plug) cylinder head 6e 6H 17,933 Iso 261, ISO general purpose metric screw threads -- General max. not specified Major diameter min. 17,697 18,000 plan. max. 16,959 17,216 Pitch diameter Iso 965/1, /sO general purpose metric screw threads min. 16,819 17,026 Tolerances - Part 1 : Principles and basic data. 16,092 max. 16,676 Minor diameter min, 15,845* 16,376 Iso 965/3, /SO general purpose metric screw threads Tolerances -- Part 3 : Deviations for constructional threads. With a root radius ≥ 0,150 mm (0,1 P). ISo3412,Road vehicles - Screenedandwaterproof spark 4.1.3.2 Tolerance classes plug and its connection -- Type 1. Iso 3896, Road vehicles - Screened and waterproof spark- The tolerance classes of thread M18 × 1,5 of the finished plug and its connection - Type 3. spark-plugs and of the corresponding tapped holes in the cylinder head are as follows : 4 Required characteristics for spark-plug 6e for spark-plugs (see note 2); and housing in the cylinder head 6H for tapped holes in the cylinder head. 4.1 Dimensions and thread (see figure) NOTES 4.1.1 Plug reach and installed height 1 The