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DURABILITY IN THE PASSENGER CHASSIS. Long Life Aimed at by the Designers of the New McCurd Product.
Page 137
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'N our issue of last week we referred very briefly to the . new McCurd chassis, made by the McCurd Lorry Manucturing Co., Ltd. of Hayes, Middlesex. It is known as
e 40-50-cwt. Mcdurd passenger chassis, and it has been signed for long life on the one hand, and, on the other, cessibility of all details so as to ensure ease of maintenance. Mr. McCurd has had considerable experience in the com 3rcia1 vehicle world, and a great deal of time and trouble were :pended on the design of the present chassis. It has only cently been placed on the market after a full testing out every detail. It is seldom that one comes across a chassis well finished; as a matter of fact, the vehicles as turned tt from the shop would do credit to any C.M.U.A. parade, cause the engine casting is painted, the lye-cover plates are tooled over and the gear
x and bevel-pinion casing are buffed over. he chassis has so many points for which erit is claimed that, as stated in our brief ,ecription last week, the demonstration vehicle
sent out with specimens of the three main anponents, the engine, gearbox and back axle, ounted in a saloon coach sothat they may
critically examined by A potential customer.
The engine is of 25.6 .A.C. rating, the four dinders having a bore of )2 mm., the piston stroke king 152 mm. The crank'aft is a sturdy job, and hrication has been well orked out, and each detail !• it is simple and accesble, the oil being forced trough drilled ways in the .anlothaft after being rawn by the pump from (e sump through a filter which is readily accessible through an aperture closed by Se ail filler) and then forced to a second filter mounted it the outside of the crankcase. It then passes by pipes 3 the three main bearings and 'up to the dynamo-drive, 'hence, by gravity, the oil falls over the timing gear.
A cross-shaft in front of the engine block is used to rive the dynamo, magneto and water pump, the dynamo sing placed vertically and the magneto being brought out 3 one end of the shaft and the pump to the other, so Lint: in each of these details there is the very acme of 'MCP'Sibility. 'A jockey pulley keeps the timing chains in notinuous adjustment.
The clutch is a Ferodo-faced cone on ball-races. It is upossible th get out of Itne, and this provides an instance f the accessibility provided throughout the chassis, in that he clutch can be taken out, put on the bench, attended to nd be back in the chassis in 40 minutes, whilst a clutch pring can easily be changed in 25 minutes. The gearbox gives four forward speeds and, like the engine, ; supported at three points on the chassis. The teeth of he gear wheels are ground, as also are the gear shafts. bower is transmitted through a one-piece propeller shaft to lie rear axle, the final drive being through a ground spiral evel and pinion, the utmost silence having been aimed at hroughont the transmission. Every detail of the axle has ,een designed for strength and reliability. Four Spicer oints are incorporated in the transmission line.
A little detail concerning the anchoring of the springs o the axle casings indicates the accumulation of experience aid the application of the lessons gained thereby. On each
side of the spring two radii are cut so as to take one-half of a holding-down bolt in each, the bolts being
diameter ; thus four holding-down bolts-serve to position the spring on the spring pad in addition to tile stud commonly employed, so that should these holding-down bolts slacken off they serve to hold the spring in position, as the small stud would not do. Every precaution, however, is taken against the slackening of the nuts on the holding-down bolts.
All the brake work is interchangeable, and brake power is ample. The adjustment of the brakes is brought to extremely accessible points.
The full equipment of the chassis inclees a dynamo with five lamps and battery, completely wired up, and a
mechanical tyre pump driven from the gearbox and operated from outside of the chassis, a. spare tyre and rim, front wings, speedometer and spring gaiters.
The dimensions are as follow:—Wheelbase, 15 ft.; track (frout and rear), 5 ft. 6 ins. • overall width, 7 ft. 3 ins.; length from dusk to centre of back axle, 12 ft. 4 ins., and to the end of frame, 16 ft. 7 ins., or 18 ft. 10 ins. ; height of the frame from the ground (loaded), 2 ft. 2 ins., (unloaded), 2 ft. 5 ins.; ground clearance throughout, 9f ins.; turning circle, 54 ft. The price of the chassis complete is £800.