Engineering News
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LV in diesel deal
LEYLAND VEHICLES and the Cummins Engine Company have jointly signed a major collaborative agreement to develop and manufacture a new generation of small, high-technology diesel engines beginning in the midEighties.
The announcement was made at the Institution of Mechanical Engineers in London by David Andrews, chairman of the Leyland Group, and John Hackett, executive vice-president and chief financial officer of Cummins.
This means that Leyland will manufacture 40,000 Cummins Family 1 engines annually, at its Bathgate plant. Leyland will purchase engine blocks and heads from Cummins in the United States, and produce and sell to Cummins, crankshafts and camshafts for use in Family 1 engines to be assembled in the States at North Carolina.
Half the engines produced at Bathgate will be sold in Europe by Cummins to manufacturers of agricultural, marine and power plant equipment.
The agreement will help provide a future for Leyland's engine manufacturing plant at Bathgate where a multi-million pound investment will be made.
The Family 1 engines are to be used primarily in those Leyland light and medium-duty lorries which currently use the 98Series diesel engine with actual installation scheduled for the second half of the Eighties.
In the new range, engines with a swept volume of 0.96 litres per cylinder will be produced in three-four and six-cylinder configurations ranging from 37 to 142kW (50 to 190bhp).
Family 2, with 1.4 litres per cylinder, will be available in sixcylinder form only, covering the 119 to 186kW (160 to 250bhp) power range.
Both series will be in naturally aspirated, turbocharged and charge-cooled versions although the three-cylinder engine may be a naturally aspirated unit only.
Cummins claims to have achieved objectives of low manufacturing costs, excellent fuel consumption, high reliability, durability, ease of service, adaptability, plus meeting worldwide noise and emission standards.
Among the many noteworthy features is the high level of parts commonality throughout the range: In the three-cylinder engine only 226 parts are needed for all seven engines in Family 1 and of these 186 are common to all the engines.
The water pump is a cartridge unit fitted into the side of the engine block and the fan is carried on a separate shaft and bearings with four separate mounting positions, depending on the engine application.
Similarly mounted is the oil pump rather than in the oil sump. This allows for a reversible sump pan for front or rear configuration.
Cast onto the cylinder head is the air manifold which, it is claimed, improves the level and consistency of the air swirl.
It also provides strong support for the charge cooler and optional accessories. The fitting of fillet-hardened crankshaft and alloy steel connecting rods provide a maximum stress range comparable with Leyland's heavy-duty engines.
Fitted into a cavity in the cylinder block water jacket is the plate-type oil cooler. Its die cast aluminium cover carries the head for the spin-on oil filter and pressure regulator. Pipes, hoses and clips are not needed.
Inlet and exhaust valve seats are induction hardened while ample cooling is provided around the exhaust valve seat and valve guide. The remainder of the exhaust port is uncooled to assist the performance of turbocharged and charge-cooled engine versions.
Leyland is satisfied that the performance perameters of this engine will contribute to providing its customers with costeffective, fuel-efficient vehicles for the future.
Cummins Family 1 engine is a result of a joint venture between this company and JI Case Company for the manufacture of a new series of advanced technology small engines. This series is a key element of Cummins' product expansion programme.