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है”ह”ह

IS 13050 (1991): Internal Combustion Engines - Valve SeatInserts [TED 2: Automotive Primemovers]

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

1.1 This standard specifies the requirements fordifferent -types of valve seat inserts, shape anddimensional tolerances used in Internal Com-bustion Engines including automotive engines.This standard covers valve seat inserts up to andincluding 120 mm outside diameter.

1.2 This standard covers both finished and semi-finished valve seat inserts. The latter will beinterference fitted in the counter bore provided-in the cylinder head casting and undergo seatcutting to the size.

1.3 This standard does not cover the semi-finished valve seat inserts which are cast in-situin tduminium cylinder heads.

2 REFERENCES

The following Indian Standards are necessaryadjuncts to this standard:

IS No. Title

1570 Schedules for wrought steels:( Part 5 ) :1985 Part 5 Stainless and heat-

resisting steels ( secondrevision )

7494:1981 Steel for valves for internalcombustion engines (firs!revision )

9321:1979 Material for alloy cast ironvalve seat inserts

3 DEFINITION

3.1 Valve Seat Insert

Valve seat inserts are defined as metallic ringswhich are installed in heads or in blocks toprovide a mating surface for the valve. Figure 1shows the terms used in inserts.

4 TYPES

.4.1 Conventional Type

Shall be as shown in Fig. 2. It is thin walled,short and of cylindrical section. It is used inall types of engines.

4.2 Flexible Type

Shall be as shown in Fig. 3. This type is normallyused in air-cooled engines.

5 MATERIAL

5.1 Alloy cast iron for valve seat inserts shallconform to IS 9321:1979.

5.2 Alloy steels for inserts shall conform tograde V-9 of IS 7494:1981 and grade 8 ofIS 1570 ( Part 5 ) :1985.

5.3 Other materials such as sintered metals,steels with overlay or cobalt base may also beused subject to agreement between the purchaserand the supplier.

6 TOLERANCES

6.1 The dimensional tolerances are shown in.Fig. 4 and 5.

6.2 Counter bore dimensional tolerances areshown in Fig. 6.

6.2.1 The outer diameter tolerance on the valveseat insert and the corresponding internaldiameter tolerance for the counterbore given inFig. 4, 5, and 6 are suitable for valve seat insertsUp to and including 80 mm diameter. For valveseat inserts above 80 mm outer diameter thetolerances shall be as agreed to between thepurchaser and the manufacturer.

7 INSTALLATION

7.1 Installation Procedure

Installation of valve seat inserts require the useof a tool which will assure proper location andsquareness of the insert with the counterbore.The tool may pilot in the valve guide enteringthe insert by-means of a short pilot, small in dia-meter, than the inside diameter of the insert andproviding a square shoulder through which loadis applied to drive the inserts. Inserts areinstalled by pressing into location. A commonpractice is to chill the inserts prior to installa-tion. The decreased amount of press fit obtainedreduces the tendency to shear the wall of thecounterbore and permits the installation withthe design press fit. Comparable results can beobtained by heating the cylinder head or blockrather than chilling the inserts. In someinstances successful installations are madewith both block-heads and inserts at roomtemperature.

7.2 Recommended Press Fit

Based on the expansion rate of insert materialand the head or block material as well as theoperating temperature differential for a parti.cular engine, the press fit that shall be requiredto retain the insert in position is ascertained.The recommended interference fit based on thehole basis (H) system is shown in Fig. 4, 5 and6. 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 SURFACE

---P”

INNER DIA

OUTER DIA 4

FIG. 1 TERMINOLOGY

FIG. 2 CONVENTIONAL TYPE INSERTS

CLEARANCE ,__

FIG. 3 FLEXIBLE TYPE 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 COUNTERBORE IN CYLINDER HEAD

fit is within limits since excessive press fit raises the compressive stress level in the insert resulting

to between the purchaser and the manufacturer

in plastic flow and loss of press fit. This could may be provided.

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.

9 MARKING 11 SAMPLING

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 be 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

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