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Show Truck Drivers May Profit by Some Hot Weather Tips not dissipate the heat. It must be cleaned out. In filling the radiator only clean water should be used. Strain the water wa-ter through a cloth where none but dirty water is available. Above all, do not use buckets in which, oil has been kept. Keep the fan clean and well greased, so that It will turn freely. Not all of the cooling of the engine is effected by water; but lubricating oil piays an important part, as it cools the bearings. Keep the crank-case crank-case clean; it cools the oil. It has been found that gasoline washes the lubricant from the cylinder walls and a mixture of gasoline and oil runs into the crankcase. where, in time, it destrovg the lubricating qualities of the oil. For this reason the oil in the crankcase should be drained and replaced re-placed with new oil every 1500 miles, if this is not done the oil will be unable un-able to properly lubricate the ribbing surfaces and heating will result. The average working temperature of oil in summer is higher than in winter, and so oil of the same body ' will be thinner. Sometimes it is ad-; ad-; visable to use a grade heavier oil in summer. In excessively hot spells an especiallv heavy grade of oil may be required to maintain the oil at the proper consistency in operation. "When a heavier oil is used care should be tiiken not to work the engine en-gine too hard before it is warmed up. Buy oil only from reliable refiners, FIRST of all, it is necessary to ; understand the cooling system. Do not expect the truck to labor la-bor in low gear up long grades or through deep sand, perhaps with a trailer, and still keep cool, if carbon deposit is permitted to accumulate accu-mulate in the cylinders, if insufficient water is put in the radiator, if the oil level is low or the oil is of the wrong kind. At the beginning of the season it is ordinarily necessary to change the carbureter adjustment, that in summer sum-mer being a trifle leaner than that for winter. Overheating is sure to result if the carbureter is improperly adjusted. ad-justed. Timing has an important bearing on cooling. In hut climates, where temperatures tem-peratures arc excessive for a considerable consid-erable part of the year, the engine may be made to run cooler, but at a ! slight sacrifice of power, by setting I the camshaft one tootli ahead (earlier) (ear-lier) on the timing gears, so that the exhaust valves open easier. A weak spark has the same effect as lare spark timing, and overheating will result. Difficult grades can be made with ' greater speed and less fuel in intermediate inter-mediate than if the engine is permitted permit-ted to labor in high to the point of stalling. Contrary to popular supposition, suppo-sition, the engine will cool better if It is not obliged to labor excessively. Keep the exhaust clear of obstructions obstruc-tions and do not allow mud to cake on the outside of th muffler or to clog the outlet. The radiator must b'"1 filled as full as possible. Do not allow the overflow over-flow pipe to become clogged op flattened flat-tened by a blow or kink, or slip down in the radiator. Use only the best, quality of rubber hose for water connections. The inside in-side of ch-'ap tubing is apt to dissolve and the rubber parth-les clog up the system. Go over lm.se connect ions in the spring, beeaus-' sm antifreeze solutions have a d-.-lct'Tious fft'-ct upon (he rubber. A Is- IIr'.v leave a stum inside the radi i-.r which will |