Bsi bs au 264 1995 (1999) iso 2345 1994

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[.]

ISO 2345:1994

ICS 4 0 0.5

This Bri sh Stan ard, ha ing

b en pre ared u der the

directonof the Eng ine ring

SectorBo rd, was published

u derthe authoriy of the

Stan ards Bo rd an comes

into fect on

1 Decemb r1 9

© BSI 1 -1 9

The folowing BSI references

relate to the work on this

stan ard:

Commi e reference MC /9

Draft for comment 9 / 71 4 1 DC

The prep ration of this British Stand rd was entrusted to Tech ical

Commit e MCE/ 9, Ig nition equipment for sp rk ig nition eng ines, upon which

the folowing bodies were represented:

Society of Motor Man facturer and Tra er Ltd

Co pted member

Am endm ents is ued sinc publ cation

Pag e

Fig ure 1 — M18 × 1,5 sp rk-plug s with conical seating 3

Fig ure 2 — Housing of sp rk-plug in cy linder hea 4

National foreword

This British Stand rd has be n prep red b Technical Commit e MCE/ 9 It is

id entical with ISO23 5:19 4 R oa d vehicle — M18 ×1,5 spa r k-plugs wih conica l

s a ting a nd their cylnd er hea d housing, publshed b the International

Org anization for Stand rdization ( ISO)

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

Cros - referenc s

Publcation r f r ed to Cor esp nding British Stand rd

ISO 6 :19 3

ISO 261:19 3

ISO 9 5-1:19 0

ISO 9 5-3:19 0

BS 3 4 ISO metr ic s r ew thr ea d s

Part1:19 1 Pr inciple a nd ba sic d a ta

( Tech ical y eq uiv alent)















Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g es i an i ,

p g es1 to4, an inside b ck cov er and a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

amendments incorporated This wi l be indicated in the amendment ta le on the

1 Scope

This International Stand rd specifies the main

characteristic of M18× 1,5 sp rk-plug s with

conical seating and their cy lind er hea housing , for

use with sp rk-g nition eng ines

The fol owing stand ard s contain prov isions which,

throug h reference in this text, constitute prov isions

of this International Stand ard At the time of

publcation, the editions ind icated were v ald All

stand ards are subject to rev ision, and p rties to

ag re ments b sed on this International Stand rd

are encourag ed to inv estig ate the pos ibi ty of

a ply ing the most recent editions of the stand rds

indicated below Member of IEC and ISO maintain

reg ister of cur ently v ald International Stand ards

ISO 6 :19 3, ISO gener a l pur pos s r ew thr ea d s —

B a sic pr ofie

ISO 261:19 3, ISO gener a l pur pos metr ic s r ew

thr ea d s — Gener a l pla n

ISO 9 5-1:19 0, ISO gener a l pur pos metr ic s r ew

thr ea d s — Toler a nc s — Pa r t 1: Pr inciple a nd ba sic

d a ta

ISO 9 5-3:19 0, ISO gener a l pur pos metr ic s r ew

thr ea d s — Toler a nc s — Pa r t 3: Devia tions f r

constr uctona l thr ea d s

3.1 Terminals

The sp rk-plug terminal ma be either the sold

post or the threa ed ty pe A sp rk-plug with

thread ed terminal on which a n t is a pl ed shal

respect the dimensions specified for sp rk-plug s

with sold post terminal Se Fig ure 1

3.2 Dim ensions and threa s

Se Fig ure 1 andFig ure 2

3.2.1 Lengt h dimensions

The leng th d imensions are measured f om a

g aug ing plane defined b diameter19mm on the

seating

Dimension10,9mm ±0,3mm ma be inc eased for

certain sp rk-plug ty pes

3.2.2 Dimensions o spark-plug housing in

cyl nder head

The leng th d imensions Z and9mm ma in the

cy lind er hea are measured f om a g auging plane

defined b d iameter19mm on the seating

The Z leng th of the sp rk-plug housing in the

cy linder head shal be suficient to ensure that the

end of the sp rk-plug threa do s not project into

the combustion chamber at any point when the

sp rk-plug is tig htened to the ma imum torque

specified in3.4

3.2.3 Threads

3.2.3.1 Spa r k-plug a nd cylnd er hea d

The threa s of M18 ×1,5sp rk-plug s and the

cor esponding ta ped holes in the cy lind er hea

shal conform to ISO6 , ISO261, ISO9 5-1 and

ISO9 5-3 Their l miting d imensions and their

tolerance clas es shal be as specified in3.2.3.1.1

and3.2.3.1.2 respectiv ely

3.2.3.1.1 Limi ing d imensions

The lmiting d imensions shal be as g iv en in

Ta le 1

Ta le 1

3.2.3.1.2 Toler a nc cla ss s

The tolerance clas es of threa M18 × 1,5 of finished

sp rk-plug s an of the cor espond ing ta ped holes

in the cy linder head shal be as folows:

— 6e for sp rk-plug s ( se note1);

— 6H for ta ped holes in the cy linder hea

NOT 1 In order that sp rk-plug s complying wih this

Internatonal Stan ard can b fi ed in e istng he ds also in

e treme cases, the v lue for the ma imum tru caton of the

minor diameter of the sp rk-plug ase has b en slig htly red ced

wih resp ct to the ISO v lue

This ma imum v lue of the minor diameter is calculated fom a

d istance of H/ 6 for the ma imum tru caton inste d of the v alue

g iv n b the formula in ISO9 5-1:1 8 , clause 1, ac ording to

the formula g iv n b low:

The v lue for the b sic profile remains the same as for the

ISOthre d ( 16,3 6 – 0,0 7 = 1 ,3 9)

Dimensions in milimetres

Dim ension

Plug thr a

( on finished

plug )

Ta ped hole

in cylnde

hea

Major diameter

ma 17,9 3 not specified

Pitch d iameter

Minor diameter

min

15,8 5 a

16,3 6

a

W ith a ro t radius W 0,1 0 mm (0,1P)

Minor diameter,ma imum =

d

1 – e – 2( H/ 4 – H/ 6)

= 1 ,3 6 – 0,0 7 – 0,2 7

= 1 ,3 6 – 0,2 4 = 1 ,0 2

NOT 2 The ini al cle rance e = 0,0 7mm b twe n the pich

diameter of the thre d an of the ta p d hole is inten ed to

pre ent the p s ibiliy of seizure,as a result of combuston

de osis on the b re thre ds, when remo ing the sp rk-plug s

This cle rance is also inten ed to ena le sp rk-plug s wih

thre ds in ac ordance wih this Internatonal Stan ard to b

fi ed in e istng ta p d holes

3.2.3.2 Thr ea d ed ter mina l

For sp rk-plug s with a threa ed-ty pe terminal, the

thread tolerance clas of the terminal

[ se Fig ure 1b)] is 6e

NOT 3 De en ing n man facturing proces es,clas 7 is

ac e ta le on the finished prod ct

Nuts for use with threa ed terminals shal hav e

internal thread s to 6H tolerance prior to as embly

on the threa ed post

3.3 Other dim ensions of spark- plug and

housing in cylnder hea

The other d imensions shal be as ind icated in

Fig ure 1 andFig ure 2

The contour of the insulator is optional; howev er,

betwe n the reference planes d efined for

sp rk-plug s with sold post terminal b the

d imensions29mm and3 mm, an for sp rk-plug s

with threa ed terminal b the d imensions26mm

and3 mm, its larg est d iameter shal

be1 ,2mm ±0,3mm

Detais not specified are left to the man facturer’s

choice

3.4 Instal ation tig htening torque

The instal ation torque v alues a ply to new

sp rk-plug s without lubricant on the thread s I

thread s are lubricated, the torq ue v alue shal be

reduced b a proximately one-third to av oid

ov er tres ing The sp rk-plug s shal be tig htened

with a torque of20N·m to3 N·m in cast iron

cy linder hea s

N T 4 Eng ine man facturer ma sp cify a diferent torque

for the fir t sp rk-plug instalaton

1) Sp rk-plug man facturer are encourag ed to

ado t1 ° ± 5° for future prod cts

2) 0,7 mm pich complying wih ISO 6 an ISO 2 1

3) De en ing on man facturing proces es, clas 7 is

ace ta le on the finished prod ct

4) Leng th of usa le thre d

5) Cylin rical p rt

6) Other dimensions: se Fig ure 1a)

Fig ure 1 — M18 × 1,5 spark- plug s with conical seating

A

B

ISO 2345:1994

BSI

3 9 Chiswick Hig h Roa

London

W 4 4AL

BSI is the independent national bod y responsible for prep ring

BritishStand ard s It presents the UK v iew on stand ard s in Europe an at the

international lev el It is incorporated b Roy al Charter

Revisions

BritishStand ards are up ated b amendment or rev ision User of

BritishStand ard s should make sure that they pos es the latest amendments or

editions

It is the constant aim of BSI to improv e the qual ty of our products and serv ices

W e would be g rateful if any one find ing an inac uracy or ambig uity whi e using

this BritishStand rd would inform the Sec etary of the technical commit e

responsible, the identity of which can be fou d on the inside f ont cov er

Tel:0208 9 9 0 Fa :0208 9 7 0

BSI ofer member an indiv id ual up ating serv ice caled PLUS which ensures

that subs riber automaticaly receiv e the latest editions of stand rds

Buying standards

Order for al BSI, international an foreig n stand ard s publcations should be

a d res ed to Customer Serv ices Tel:0208 9 9 01 Fa :0208 9 7 01

In response to ord er for international stand rd s, it is BSI pol cy to sup ly the

BSI implementation of those that hav e be n publ shed as BritishStand rds,

unles otherwise requested

Inform ation on standards

BSI prov id es a wide rang e of information on national, European and

international stand rds throug h its Library and its Tech ical Help to Ex orter

Serv ice Various BSI electronic information serv ices are also av aia le which g iv e

d etais on al its prod ucts an serv ices Contact the Information Centre

Tel:0208 9 71 1 Fa :0208 9 7 4

Subs ribing member of BSI are kept up to d te with stand rd s dev elopments

and receiv e substantial d is ou ts on the pur hase price of stand rds For d etai s

of these and other benefits contact Member hip Ad ministration

Tel:0208 9 7 02 Fa :0208 9 7 01

Co yrig ht

Copy rig ht subsists in al BSI publcations BSI also holds the copy rig ht, in the

UK, of the publcations of the international stand ardization bod ies Except as

permit ed u der the Cop rig ht, Desig ns and Patents Act 19 8 no extract ma be

reproduced , stored in a retriev al sy stem or transmit ed in any form or b any

means – electronic, photocopy ing , recording or otherwise – without prior writ en

permis ion fom BSI

This do s not preclude the fe use, in the cour e of implementing the stand ard,

of neces ary detai s such as sy mbols, and siz , ty pe or g ra e d esig nations I these

d etais are to be used for any other purpose than implementation then the prior

writ en permis ion of BSI must be obtained

I permis ion is g ranted, the terms ma includ e roy alty p y ments or a lcensing

ag re ment Detais and a v ice can be obtained f om the Copy rig ht Manag er

Tel:0208 9 7 7