Trouble Cause Popping in carburetor. Flame Remedy Adjust mixture. Clean carbu- Short circuits. Misfires. Slug- new Too rich or too weak a mixture. Loose, dirty, worn, wet, or Some part of motor new Go over every wire and connec- wires, plugs, and switch. Watch where sparks wires, etc. Adjust plug Trouble Spark-plug troubles. Short circuits. Misfires. Leakage around plug. Cause Unsuitable plug. Plug too short or too long. Wet or moist plugs. Water, rust, or carbon on points. Core cracked or loose. Electrode nearly broken oor burnt through. Points touching or too far apart. Porcelain or mica core broken or sooted. Terminal for wire loose. Packing blown out or broken, allowing leak of compression. One or both points broken. Rust or oil between thread of plug and plug hole in engine. Remedy Clean and overhaul plug. Use a plug long enough to reach well into cylinder but not so long that it will strike piston or valves. Have thread in cylinder clean. See that wire connection is clean and tight. If points are badly worn or burnt use a new plug. If points are rusty, corroded, or sooty, smooth with fine emery cloth. Always have several plugs on hand and as soon as trouble is traced to plug replace with a new one; the old one may be repaired at any time. Timer troubles. Knocking or pounding. Loss of power. Overheating. Irregular firing. Explosions in muffler or intake. Badly worn timer or fibre insulation. Weak timer springs. Timer dry and stuck. Incorrect timing. Timer loose on shaft. Timer control rods bent, loose, or out of adjustment. Badly worn crank shaft, cam, cam shaft, gears, push-rod, or any valve trouble. Poor mixture which ignites slowly. Clean and oil timer. Take up lost motion and, if necessary, try a new timer. Adjust so that contact is made just after end of compression stroke when spark is retarded. Look over rods, gears, shafts, etc. Replace any weak or worn springs and any old, worn fibre. or Cause Remedy Sooty or gummy deposits on Clean valve stems by free use If pitted, worn, Pitted or scored, the valve should be to see that they are properly of power from the motor. Water in crank chamber. Water CHAPTER IX GLOSSARY OF ALPHABETICALLY ARRANGED TECHNICAL TERMS USED IN CONNECTION WITH GASOLENE ENGINES, with Ex- GLOSSARY OF TECHNICAL TERMS Accelerator-Any attachment or device for increasing speed. Advanced Spark-An electrical spark produced to ignite a charge of gas in a motor before the piston reaches the upward limit of its compression stroke. Air Lock-A gathering of air in a pipe which prevents the flow of liquid through the same. Annular—Pertaining to or in the form of a ring. Annular Bearing—A bearing in the form of a ring. Annular Opening—A ring-shaped opening. Ampere—A unit of electrical measurement nearly analogous to quantity. Ampmeter (Ammeter)—An instrument for indicating or measuring amperes. Armature-A wire coil around an iron core used in producing elec tricity between two magnets, as in a dynamo. Atmosphere—The weight, or pressure, of air, equivalent to 15 pounds per square inch. Babbitt-A composition of various soft metals used as bearings to overcome friction. Bearings made from babbitt. Backfiring—The backward or premature explosion of a gas engine. Baffle Plate-A plate or partition to turn or stop the flow or force of gases or other matter. Balance Weight-A weight attached to a crank, shaft, or wheel, to balance the explosive force of the motor and lessen vibration, as well as to overcome the tendency to a dead centre. |