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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 13050 (1991): Internal Combustion Engines - Valve Seat Inserts [TED 2: Automotive Primemovers] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” INTERNAL COMBUSTION ENGINES - VALVE SEAT INSERTS - SPECIFICATION UDC 621’43 - 462 @ BIS 1991 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 -April 1991 Price Gromp 2 Automotive Prime Movers Sectional Committee, TED 2 . FOREWORD This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Automotive Prime Movers Sectional Committee had been approved by the Transport Engineering Division Council. In this standard semi-finished as well as finished inserts have been covered. While the material covered refers to cast iron inserts, it does not preclude the use of other materials including sintered inserts. The maximum size of inserts is being aligned with the engine valve dimension, namely, 120 mm. It is expected to cover the future needs of the industry. This standard forms an important adjunct to IS 810 : 1990 ‘Internal combustion engines - Engine valve - Specification ( second revision )‘. For the purpose of deciding whether a particular requirement of this standard is complied with the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value is this standard. 1s 13050:1991 Indian Standard INTERNAL COMBUSTION ENGINES – VALVE SEAT INSERTS — SPECIFICATION 1 SCOPE 5.2 Alloy steels for inserts shall conform to grade V-9 of IS 7494:1981 and grade 8 of 1.1 This standard specifies the requirements for IS 1570 ( Part 5 ) :1985. different -types of valve seat inserts, shape and 5.3 Other materials such as sintered metals, dimensional tolerances used in Internal Com- steels with overlay or cobalt base may also be bustion Engines including automotive engines. used subject to agreement between the purchaser This standard covers valve seat inserts up to and and the supplier. including 120 mm outside diameter. . 1.2 This standard covers both finished and semi- 6 TOLERANCES finished valve seat inserts. The latter will be interference fitted in the counter bore provided 6.1 The dimensional tolerances are shown in -in the cylinder head casting and undergo seat .Fig. 4 and 5. cutting to the size. 6.2 Counter bore dimensional tolerances are 1.3 This standard does not cover the semi- shown in Fig. 6. finished valve seat inserts which are cast in-situ in tduminium cylinder heads. 6.2.1 The outer diameter tolerance on the valve seat insert and the corresponding internal 2 REFERENCES diameter tolerance for the counterbore given in Fig. 4, 5, and 6 are suitable for valve seat inserts The following Indian Standards are necessary Up to and including 80 mm diameter. For valve adjuncts to this standard: seat inserts above 80 mm outer diameter the tolerances shall be as agreed to between the IS No. Title purchaser and the manufacturer. 1570 Schedules for wrought steels: ( Part 5 ) :1985 Part 5 Stainless and heat- 7 INSTALLATION resisting steels ( second revision ) 7.1 Installation Procedure 7494:1981 Steel for valves for internal Installation of valve seat inserts require the use combustion engines (firs! of a tool which will assure proper location and revision ) squareness of the insert with the counterbore. 9321:1979 Material for alloy cast iron The tool may pilot in the valve guide entering valve seat i nserts the insert by-means of a short pilot, small in diameter, than the inside diameter of the insert and 3 DEFINITION providing a square shoulder through which load is applied to drive the inserts. Inserts are 3.1 Valve Seat Insert installed by pressing into location. A common practice is to chill the inserts prior to installa- Valve seat inserts are defined as metallic rings tion. The decreased amount of press fit obtained which are installed in heads or in blocks to reduces the tendency to shear the wall of the provide a mating surface for the valve. Figure 1 counterbore and permits the installation with shows the terms used in inserts. the design press fit. Comparable results can be 4 TYPES obtained by heating the cylinder head or block rather than chilling the inserts. In some .4.1 Conventional Type instances successful installations are made with both block-heads and inserts at room Shall be as shown in Fig. 2. It is thin walled, temperature. short and of cylindrical section. It is used in all types of engines. 7.2 Recommended Press Fit 4.2 Flexible Type Based on the expansion rate of insert material and the head or block material as well as the Shall be as shown in Fig. 3. This type is normally operating temperature differential for a parti. used in air-cooled engines. cular engine, the press fit that shall be required to retain the insert in position is ascertained. 5 MATERIAL The recommended interference fit based on the 5.1 Alloy cast iron for valve seat inserts shall hole basis (H) system is shown in Fig. 4, 5and conform to IS 9321:1979. 6. Care has to be taken to see that the press 1 Is l30!% : 1991 SEAT ANGLE 7 _ SEAT OUTER DIA L jY/(IIEAT FACE LE AN CH OR BOTTOM INNER DIA SURFACE ---P” OUTER DIA 4 FIG. 1 TERMINOLOGY FIG. 2 CONVENTIONAL TYPE INSERTS CLEARANCE ,__ FIG. 3 FLEXIBLET YPE INSERTS FIG. 4 SEMI-FIKISH INSERTS jt N12 FOR ALUMINIUM CYLINDER HEAD N8 FOR CAST IRON CYLINDER HEAD FIG. 5 FINISHED INSERTS I FIG. 6 COUNTERBOREI N CYLINDER HEAD fit is within limits since excessive press fit raises to between the purchaser and the manufacturer the compressive stress level in the insert resulting may be provided. in plastic flow and loss of press fit. This could lead to inserts dislodging from their position IO PACKING during engine operation, 8 SURFACE FINISH The packing shall be as agreed to between the The surface finish for inserts and counterbore purchaser and the s”pp*ier* shall be in accordance with Fig. 4, 5 and 6. 11 SAMPLING 9 MARKING Suitable identification mark indicating the source Sampling shall be as agreed to between the of manufacture, and any other mark as agreed supplier and the purchaser. 3 Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thert\tader. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the pro- ducer. Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may b e granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. Bureau of Indian Standards BIS is a statutory institution established under the Bureau of Indian Standards Act, I986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. . Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publication ), BIS. Revision of Indian Standards Indian Standards are reviewed periodically and revised, when necessary and amendments, if any, are issued from time to time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving the following reference : Dot : No. TED 2 ( 4886) Amendments Issued Since Publication Amend No. Date of Issue Text Affected BUREAU OF INDIAN STANDARDS Headquarters : Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones : 331 01 31, 331 13 7 5 Telegrams : Manaksanstha ( Common to all Otllces ) Regional Offices : Telephone Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg t 331 01 31 NEW DELHI 110002 331 13 75 Eastern : l/14 C.I.T. Scheme VII M, V.I.P. Road, Maniktola CALCUTTA 700054 37 86 62 Northern : SC0 445-446, Sector 35-C, CHANDIGARH 160036 53 38 43 Southern : C.I.T. Campus, IV Cross Road, MADRAS 600113 41 29 16 Western : Manakalaya, E9 MIDC; Marol, Andheri ( East ) BOMBAY 400093 6 32 92 95 Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. PATNA. THIRUVANANTHAPURAM. Printed at Swatantra Bharat Press, Delhi, India