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Popping in carburetor. Flame
Adjust mixture. Clean carbu-
Short circuits. Misfires. Slug-
Too rich or too weak a mixture.
Loose, dirty, worn, wet, or
Some part of motor
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.
Sooty or gummy deposits on Clean valve stems by free use
If pitted, worn,
scored, the valve should be
to see that they are properly
of power from the motor.
Water in crank chamber. Water
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.