Good Looks a Feature of American 1248-tonner
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Aluminium Finish, 12 Speeds and High Standard of Equipment F"quality of finish a new 12-18-tonner recently introduced by the Sterling Motors Cor poration, Milwaukee, Wisconsin, is certainly noteworthy. As can be seen from an accompanying •picture the aluminium finish gives the bonnet and cab a most atractive exterior. The model Is equipped with a six-cylindered engine having a bore of 5 ins, and a stroke of 51 ins., the piston displacement being 677 cubic ins. A maximum torque of 470 lb.-ft. is developed and the compression ratio is 5.35 to 1.
Of heat-treated chrome-nickel steel, the crankshaft is supported by four main bearings of 3i ins. diameter. All connecting rods are rifle drilled. An oil-level equalizer assures delivery of lubricant under all conditions of oil temperature. The cylinders are of molybdenum alloy iron, cast in pairs, and are not integral with the crankcase, which is of aluminium alloy.
There is a built-in governor which limits engine speed to 2,000 r.p.m. The centrifugal water pump has an A38 . unusually high capacity and delivers water in directed paths throughout the cylinder block and head. All valve seats are surrounded by water. The radiator has a frontal area of 897 sq. ins. Features of the electrical equipment include a heavy-duty high-output voltage-regulated generator which is gear driven and two I2-volt, 158-amp.hr. batteries.
Of special note is the standardization of a three-speed auxiliary geartIox, which in conjunction with the main four-speed unit provides 12 forward and three reverse speeds. The extremely wide gear range and proper intermediate ratios thus afforded result in greater fuel economy, higher average road speeds and reduced operating time.
An unsually wide track permits ail exceptionally small turning circle. Driving stresses are taken through adjustable V-type radius rods that are not offset. The four-wheel air brakes are actuated by diaphragms., Front and rear drums measure, respectively, 171 ins. by 3 ins. and 19 ins. by 6 ins. Having a total area of 708 sq. ins., the shoe facings are 1 in. thick. Westinghouse slack adjusters permit simple adjustment. A parking brake of the -external-contracting type is mounted on the transmission.
Designed with a large safety factor, the frame is of manganese steel, and has a maximum depth of 12 ins: and a thickness of I in. The standard tyre equipment is 11.25-24 at the front and 13.50-24 at the rear.