B.M.C. Engine and Gearbox Changes
Page 36
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WlTH effect from next month, all fourand six-cylinder diesel engines manufactured by the British Motor Corporation at their Adderley Park, Birmingham, factory will have a new gear-type timing drive in place of the chain drive which has been employed on these engines since they were introduced. The engines affected are the 3.4-litre and 5.1-litre units. The 5.7-litre diesel, which is optional equipment in several of the larger B.M.C. chassis, already has this type of gear drive.
A specification change coming into immediate effect concerns the E.N.V. five-speed gearbox offered as optional equipment in B.M.C. 5-, 6and 7-ton models, as well as in 12and I5-ton tractive units. The indirect ratios of this box have been changed to 6.923, 3.78, 2.24 and 1.47 to I, with reverse gearing of 6.857 to 1. The box formerly used had indirect ratios of 7.41, 4.381, 2.396 and 1.478 to 1, reverse being 7.34 to 1. In addition to reducing the risk of overloading the standard rear axle when the optional 5.7-litre diesel engine (with which this box is standard) is employed. the higher gearing is claimed to give an improved road performance.
The Austin 7-ton tipper which is featured in the road-test report on pages 392-395 was equipped with the earlier type of five-speed gearbox and an engine with chain timing drive.
B.M.C.'s NEW DESIGN CENTRE fl\i the tenth anniversary year of the 1 British Motor Corporation another major step has been taken in consolidating the group. This is the completion of a new flm. design building at Longbridge, which brings together for the first time the majority of the Corporation's
vehicle design staffs. All commercial vehicle design work will now be done in this new central building except for that associated with some of the larger engines and with the Gipsy. which will remain at the Morris Adderley Park works.