Arizona republican., 1920-05-09
Overloaded Troubles

Oyerheating is a rather common complain in summer, and sometimes, while no serious results occur, the mo torist is delayed on the road and often required to spend a little time endeav- oring to determine the exact cause. Because there are numerous causes, every owner should be familiar with the more common ones-
 All makes of cars but two are water cooled, hence we shall deal with water cooled engines only. Naturally, in such engines partial depletion of the water system means an overloaded engine This is more particularly the case with thermo- syphon cooled engines, which require a complete circuit Of water I is therefore a good plan for the own CT of a car with a thermo syphon cooled engine to see that the radiator always is full. In pump cooled en- zine there is more force back of the water and a lower level may be carried without the danger of overheating.
 Leaks in the water system naturally bring about the reduction of water supply and consequent excessive heat ing of what water remains
 Anything tending to interfere with the free circulation of the water through the radiator or the water jacket keeps the jacket water in con tact with the hot cylinders too long. resulting in boiling of that water Ob- structionS may be in the form Of dirt or sediment in the radiator, disin- tegrated hose connections, which par tiaIly clog the passageways; an ob- struction of dirt or Jumps Of rusty material in the water jacket.
 Running for too long a period in low gear, or even second, may cause over heating. This overworks the engines. Running on retarded spark, especially for any distance under load, as up grade will cause overheating. Instead of r(1p6 Sr1arIS in high run with advanced spark in second slowly.
 It is quite possible for the ignition timing to be wrong, so that manipula- ton of the lever will not advance the spark enough to keep the engine cool. This is a matter for an ignition man to correct ,aS 1t may be due to q num- Der of causes, the commonest being wrong setting of the timer or malad- justment of the interrupter points.
 One of the common causes of over heating is due to a slipping fan belt. It is absolutely necessary for the fan to cause sufficient air draft to cool the water as it flows through the radiator A slipping belt reduces the fan speed and thus cuts down the draft. The belt should be taut but not tight Tight belts usually wear fast and break, and they also wear the pulley bearings.
 A poor mixture, usually a rich one. brings about oyerheating.- Carbon in the cylinders also will cause the engine to heat rapidly, but at the same time the engine will lack power. knock and generally perform poorly. If you get the whole combination of trouble indi- eating engine debility and then get the overheating it usually is sure indica- tion of carbon.
 Any drag on the engine. causing it to overworlz. is likely to cause over heating. When the clutch slips the engine has to do more work to accom- plsh a given set of results; also when the brakes drag.
 If the engine should overheat, the sooner it is stopped the better. After stopping the engine allow it to cool for about ten or fifteen minutes; 1t de- bends upon how hot it is. Then add cold water slowly until the system is full. Then start the engine again, noting through the radiator filler if there is circulation. You might open the radiator dran, when the engine is stopped, to see if there is free flow through the unit. PokS wire through the drain to make sure the drain itself is free. You then can go over the car to see that the spark advances with lever movement, that the mixture is not too rich as indicated by pungent exhaust, and by noting if the fan belt slips.