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Type X

Type X box van from Thornycroft's 1924 brochure.

A smaller version of the 4 ton (4,064kg) Type J, the 3 ton (3,048kg) Type X's loaded weight was 124cwt (6,350kg) while the redoubtable J weighed no less than 159cwt (8,077kg). Despite its less powerful 40hp M/4 engine than the J's 50hp BB/4, Thornycroft evidently felt that it could afford to make the Type X longer legged than the J (using 1924 data), by specifying higher overall ratios in all gears. The X and the 2 ton (2,032kg) BT were jointly replaced by the 2.5 ton BX (2,540kg), which lay between the X and BT in carrying capacity.

Sunderland removal contractor Peter Wilkinson operated this hinged-sided 40hp Type X.

 

Specification of Thornycroft 2½ / 3ton Chassis Type "X" March 1924

For a nett load of 60cwt (3,048kg) in an open lorry body, or 50cwt (2,540kg) in a van body.

Chassis Weight, in running order, 56cwt (2,845kg).

Gross Load, including cab and body, 72cwt (3,658kg). 

Total Laden Weight 128cwt (6,502kg).

Axle Weights 

Front, 40cwt (2,032kg). 

Rear, 88cwt (4,470kg).

Engine

40hp (type M/4). Four-cylinder cast in pairs. Valves on opposite sides. Bore 4½ins (114mm) x Stroke 6ins (152mm).

Ignition

Damp-proof high-tension magneto.

Carburettor

Of improved float feed type. A pilot jet is fitted for starting and slow running.

Control

The carburettor throttle is controlled by a lever on the steering column and also by a foot accelerator. A separate throttle is fitted above carburettor controlled by a governor which prevents engine exceeding a predetermined speed. The magneto is controlled by a second lever on the steering column.

Petrol Tank

Placed on the dashboard where it is accessible for easy filling, and allows of a constant gravity feed to the carburettor under all conditions. The capacity is 20 gallons (91 litres), and a very large filler is fitted which does away with the need for a funnel.

Clutch

Of the cone type. A pressed steel cone lined with ferodo engages the cast-iron flywheel. This is of large diameter, ensuring smooth running, absence of slip, and maximum life of clutch lining. The clutch springs are easily accessible for adjustment. A large and efficient clutch stop is fitted to facilitate gear changes. Between the clutch and the gearbox, a leather disc-type universal coupling is fitted.

Gearbox

A one-piece casting with large inspection cover. Ball bearings on primary and secondary shafts with ball thrust behind brake drum. The drive on top is direct with three indirect gears and a reverse. At 1,000rpm of engine the road speeds are as follows: Reverse and first, 3½mph (5.6kph); second 6mph (9.6kph); third, 9¾mph (15.7kph); fourth, 16mph (25.7kph).

Change Speed

Operated through a gate type quadrant.

Final Transmission

Live axle fitted with overhead type worm gear. The central portion of the axle is composed of a cast-steel casing of ample strength into which is fitted the differential worm gear, carried in a self-contained housing which, without taking the load off the road wheels, can be removed bodily at any time. Standard ratio 7.25 to 1.

Brakes

Two brakes are fitted: a foot brake, of the contracting type, operating on a drum at the rear end of the gearbox; and a hand brake of the expanding type, which is applied on the rear wheels direct. The drums are of very large diameter. Both brakes can be adjusted for wear by hand without the use of tools.

Mud-Shield

A sheet metal mud-shield under the fore part of the chassis protects the mechanism from dust and mud.

Front Axle

The axle body is of H-section steel, drop forged in one piece. The swivel arms are of nickel steel, with ball thrusts on the pivot pins taking the weight, giving easy steering.

Frame

Channel section pressed steel. Strong, but light. The engine is suspended on the three-point system, so that twisting of the frame members due to uneven road surfaces has no harmful effect whatever.

Steering Gear

This is fitted with ball bearings and ball thrusts, which help to render the steering very easy.

Steering Lock

The minimum width of road for reversing direction without using reverse gear: Standard chassis 50ft (15.2m); 14ft (4.26m) wheelbase chassis 56ft (17.1m); 15ft 6ins (4.72m) wheelbase chassis 59ft (18m).

Wheels

Nominally 40½ins (1,029mm) diameter over tyres on front and back. Of cast steel with solid rubber tyres. The wheels are carried on phosphor-bronze floating bushes of large size.

Tyres

Solid rubber singles on front wheels, 100 x 881mm; twins on back wheels, 110 x 881mm fitting sizes.

Clearance

Minimum clearance underneath chassis, fully laden, about 11ins (279mm).

Wheel Base

Standard chassis, 13ft (3.96m). Extended wheelbase chassis for coaches or omnibuses, 14ft (4.27m), or 15ft 6ins (4.72m).

Track

Front wheels 5ft 7¼ins (l.71m.). Centre-to-centre of twin tyres on back wheels 5ft 4ins (1.63m).

 

Downloads

Chassis diagram 108kb pdf

Dimensions information 99kb pdf