Halley's Latest Model
Page 61
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a Perkins-engined Oiler
A NEW chassis recently added to the ft commercial-vehicle range of Halley Motors, Ltd., Yoker, Glasgow, is an oil-engined model, built for dealing with 95-cwt. gross loads. Two examples of this new product, which is available in normal and forward-control patterns at the same price (£750), will be on view at the Scottish Show.
The engine is the Perkins Leopard four-cylindered unit, with' a bore of 100 mm. and a stroke of 127 mm., the swept volume being four litres. It is rated at 24.8 h.p. and develops 30 bap. at 1,000 r.p.rn. and 60 b.h.p. at 2,400 rep an, The cylinder head is of patented design and carries the rockers and rocker gear for the valves, which are protected by an oil-tight light aluminium cover. The crankshaft is supported in. five hearings of generous proportions.
Other features of the engine include light H-section chrome-molybdenum steel connecting rods, aluminium-alloy pistons, triple roller chain drive for the camshaft, fuel pump and governor (the chain being provided with an automatic tensioner). Bosch fuel pump mounted on the near side, automatic timing, pump circulation for the cooling water, and high-pressure forced lubrication. The induction passages are formed integral with the valve-gear cover, the openings to the atmosphere being protected by gauzes having an area many times the combined opening of the inlet valves. This is a neat arrangement and obviates the need, in normal cases, for separate air cleaners, which are sometimes difficult to accommodate, especially in forward-control chassis.
A feature of the engine is the clean appearance of the off side, all auxiliaries being mounted on the near. side.
The drive from the engine is taken through a single dry-plate Ferodo-faced clutch to a four-speed-and-reverse gearbox, and then to a worm-driven rear axle of the fully floating type.
The gearbox ratios are as follow:— Top speed, direct; third speed, 1.7 to 1; second speed, 2.61 to 1; first speed,
5.27 to I; reverse, 8.23 to 1. The standard rear-axle ratio is 7.25 to I.
The tubular two-piece propeller shaft has three metallic universal joints, the centre coupling being supported by a ball bearing carried by a frame crossmember. On the normal-control chassis a central gear-change lever, operating on a ball joint, is used, whilst a projecting bracket with lever is provided for the forward-control chassis.
The rear-axle casing is machined from a solid nickel-steel stamping and, by withdrawing the nickel-chrome-steel driving shafts, the entire worm gearing and differential can be removed without disturbing the axle. The wheels run on adjustable taper roller bearings. The front axle is an I-section stamping, the stub axles and steering arms being particularly robust. The steering gear is of the cam-and-lever type.
• So far as brakes are concerned, the hand brake takes effect on only the rear wheels, whilst the foot brake, through the medium of a servo, actuates shoes in drums on all four wheels.
The frame is of pressed-steel channel section and is liberally braced by cross-members; it is carried on semielliptic springs. The Tecalemit groupednipple system of lubrication is utilized throughout the chassis. The wheels are. of the Dunlop standard disc pattern and carry 34-in. by 7-in, pneumatic tyres of the same make, twins being used at the rear.
The forward-control model has a wheelbase of 12 ft. 6 ins, and the normal-control chassis one of 15 ft., the length over all of the former being 20 ft. 4 ins, and of the latter 23 ft. 9 ins. In each case, the front track measurement is 5 ft. 61 ins., and the rear track 5 ft. 71 ins., whilst the height unladen is 2 ft. In ins., and the ground clearance 91 ins. In the case of the forward-control model, the length of the frame behind the driver is 15 ft. 4 ins., it being 1 in. less in the case of the normal-control chassis. The diameter of the turning circle of the forwardcontrol chassis is 99 ft. 6 ins., and of the normal-control model 52 ft. The approximate weight of the chassis is 47 cwt.