0.008 in. Bore Wear After 510,000 Miles.
Page 43
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WHEN a Leyland 0.600 9,8-litre engine was dismantled for the first time after covering 510,000 miles, it was found that the average maximum cylinder-bore wear was 0.008 in. and gudgeon-pin maximum wear on the worst pin was 0.00075 in. Maximum ovality of big-end journals was 0.00025 in., and bearing clearances were 0.006 in. for the first main bearing and 0.007 in. for intermediate bearings. This was reported to the manufacturers by Messrs. W. Gibson and Son, Carlisle hauliers. The engine was installed in a Beaver lorry, and although it had been working satisfactorily it was decided to inspect the unit when the stated mileage was attained. Camshaft and valve gear were found to be in good condition, the valve seats being free from pits. Wear on the stems of inlet valves was between.
0,0005 in. and 0.003 in., and on exhaustvalve stems it was 0.001-0.007 in.
The condition of the engine was largely attributed to the use of a topgrade oil, which was frequently changed, and the maintenance of the engine air cleaner in good condition.
WEAR AND LUBRICATION CONFERENCE AFTER 20 YEARS
AN important conference on lubrication and wear—the first for 20 years —has been organized by the Institution of Mechanical Engineers. It will be opened on October 1 and technical sessions will continue until the evening of October 3. Whole-day and half-day visits have been arranged for parties of delegates, many being concerned with the motor industry, and there will be two visits to research centres near' Chester and near Glasgow. Charges, other than for students and graduates of the Institution, will be: registration £2; visits registration £1 5s.; complete sets of papers £2; buffet meals 78. Visits, travel and accommodation can be arranged through the Institution's travel agents. The programme of meetings and visits will occupy the whole week.