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300,000 Miles Without Overhaul O FFICIALS of Leyland Motors, Ltd., recently
Page 57
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observed the dismantling of a Leyland 0/600 125 b.h.p. oil engine after it had been removed from a double-deck bus which had been operated by Warrington Corporation for 300,000 miles. During this period the unit had not had an overhaul, neither had the sump nor cylinder heaii been removed. It was found that the pistons and combustion chambers were free from carbon and all the rings were free. The oiltransfer holes in the scraper-ring grooves were, however, choked. Maximum wear on the dry cylinder liners was 0.008 in. on the thrust side. No. 1 piston and connecting rod were removed and it was found that the bigend bearing had suffered practically no wear. The centre main bearing, which normally shows more wear than the other main bearings, had its fine flashing of indium just worn sufficiently to allow the copper in the strip bearing to be seen. In general, the condition of the engine was such that it could have run for a much longer mileage before requiring attention.
The maintenance procedure adopted
by Mr. E. V. Dyson, Warrington's general manager and chief engineer, is to top-up the sump every night with good-quality oil and to change oil every 5,000 miles. At every oil change the engineis given a general inspection, partidular attention being given to fuel and lubricating-oil-pipe joints, the cooling .system and control linkages. At 10,000 miles, the 5,000-mile procedure is supplemented by a change of -injectors, checking the valve gear, with particular attention to tappet clearances, and cleaning fuel and air fillers. . Calibration of fuel pumps or the fitting of new elements to them is done when necessary, after a careful cheek on performance records and a regular visual inspection of the exhaust gases. The twit. concerned is one of 20 originally fitted to 2121 double-deckers supplied to the corporation over six years ago. With the exception of five, all have been in service without engine overhauls. Top overhauls were given to the five because of oil or water leaks resulting from a damaged oil pipe or gasket. All, however, have completed mileages near the 250,000 mark and, of course. are still in regular service.