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Show Worn Piston Rings Will Cause Overheated Motor The average motorist, when he becomes be-comes aware of an overheated engine, usually thinks immediately of such common causes of motor heat as the lack of oil or water. There are, however, how-ever, still other reasons that are just as potent and dangerous. One of these Is the worn piston ring. Automotive experts tell us that, on each compression stroke, part of the gas vapor passes down past the loose-fitting loose-fitting piston rings into the crank case and there condenses and mixes with the oil, thus causing a gradual thinning out of the lubricant. Consequently the rubbing steel parts are "starved" of oil, and friction at once begins. The mixture of oil and gas, the function of which is to form the film of oil between the cylinder walls and pistons, is soon broken down under the intense cylinder tempara-ture. tempara-ture. The gasoline Immediately burns under high temperature, leaving a carbon car-bon deposit and leaving the rubbing surfaces hard and dr3'. This, cannot help but create heat, which at once registers on the heat indicating device placed on the radiator cap, thereby warning the motorist to act before It Is too late. |