MODEL
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Scarnmell Trunker Mk II 10 ft. G in. wheelbase twin-steer six-wheel forward-control tractive unit with standard plastics cab coupled to Scarnmell Challenger T tandem-axle semi-trailer.
MAKERS
Scan-in-lel' Lorries Ltd., Tolpits Lane, Watford, Herts.
ENGINE
Leyland Power-Plus 0.680 six-cylinder directinjection diesel engine; bore 127 mm. (5.9 in.); stroke 146 mm. (535 in.): piston swept volume 11.1 litres (677 Cu. in.); compression ratio, 15.8 to 1; maximum net output 200 b.h.p. at
2,200 maximum net torque 548 14. ft. at 1,200 r.p.m.
SETTINGS
1.0., 10 deg 8,1.0.0., I.C., 50 deg A.B.D.C., 5.0,, 46 deg 8.8.D.C., E.G., 14 deg A.T.D.C.: valve clearances, 0,020 In.; firing order, 1536.2.4.
TRANSMISSION
Through 16.25 in.-diameter single-dry-plate clutch to Scarnmell six-speed constant-mesh gearbox, thence by one-piece propeller shaft to the Scammell fully-floating double-reduction Ispiral-bevel-and-epicyclio-gearing) rear axle.
GEAR RATIOS
6.1, 4.07, 2,53, 1.61, 1 and 0.666 to 1 forward, reverse 7.8 to 1. rear axle ratio 7.78 to 1
BRAKE SYSTEM
Tractive unit: Clayton Dewandre air pressure system with cam-operated leading-and-trailingshoe units at all wheels. Brake actuation by triple-diaphragm chambers at the first-steering and driving axles and by single-diaphragm chambers at the second-steering axle. Firststeering axle secondary diaphragms and auxiliary line to semi-trailer pressurized through handreaction valve in cab for secondary system. Single-pull handbrake linked to driving axle only with secondary diaphragms of actuators at the axle pressurized on application of lever. Second hand reaction valve in cab for independent actuation of semi-trailer brakes. Semi trailer Clayton Dewandre three-line air-pressure system with cam operated leading-and-trailing-shoe units at both axles actuated by triple, diaphragm chambers. Wheel-type parking brake linked mechanically to brakes of leading axle only.
BRAKE DIMENSIONS
Diameter of drums, tractive unit steering axles 15.5 in., tractive unit rear 15,5 in., semi-trailer
16,5 in., width of linings, tractive unit steering axles 4.5 in., tractive unit rear, 7.0 in., semitrailer, 7.0 in.; tractive unit frictional area, 820 sq. in., semi-trailer frictional area, 768 sq. in., total frictional area, 1,588 sq. in., that is 49.3 sq. in, per ton gross weight as tested.
FRAME
Tractive unit: pressed-steel channel section with five crossmembers bolted in position.
Semi-trailer: I-beam main members with 20 crossmernbers welded in position.
STEERING
Maries cam and double roller with hyd power assistance by Adwest ram.
SUSPENSION
Tractive unit; semi-elliptic springs and tel dampers at the front axle and driving ' combined leaf-spring and air susper.sion second-steering axle.
Semi-trailer; semi-elliptic springs with balance beams and radius-rod location.
ELECTRICAL
24 V compensated-voltage with 105 a.h. batteries.
TANK CAPACITY 50 gal.