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Show Proper Type Spark Plug Is Important Stressing the importance of using the correct type of spark plug, H. Ka-bezzana, Ka-bezzana, research engineer, says nearly near-ly all spark plug sooting trouble can be traced to one of these causes: Wrong plug used. Motor operating at very low temperature. Long runs with carburetor choked, or partly choked. Very rich caburetor mixture. Oil pumping. Weather driving conditions when motor is run only short distances and never attains an operating temperature temper-ature high enough to burn oil and soot before It carbonizes. Sooting and oiling trouble can often be overcome by checking and correcting correct-ing conditions indicated above. It Is of first importance that the correct plug be used because, a plug having Insulation that is too short on the lower end will foul quickly. This is because the short Insulator will not get hot enough to burn off soot and oil before carbonization takes place. Mr. Eabezzana added that as motorists motor-ists change their spark plugs after 10,000 miles,, they should be sure that the proper type of. plug is Installed. |