ENGINE SMOKES
Black smoke indicates that the mixture is too rich; blue smoke is a sign of too plentiful lubrication. Oil that is too thin, or that is of a poor grade, will cause smoking; good quality oil of the grade recommended by the manufacturer should always be used.
Broken piston rings, or rings stuck in their grooves, will be the cause of smoking because they will permit an excess of oil to pass by them.
CHAPTER XIV
CAUSES OF TROUBLE
| Engine will not start. | No mixture. |
| No ignition. | |
| No compression. | |
| Engine starts, but will not continue running. | Clogged fuel pipe or strainer. |
| Air-bound tank or carburetor. | |
| Clogged exhaust. | |
| Wet spark plugs. | |
| Governor out of adjustment. | |
| Engine loses power. | Retarded spark. |
| Poor compression. | |
| Overheating. | |
| Clogged exhaust. | |
| Incorrect mixture. | |
| Governor out of adjustment. | |
| Tight bearings. | |
| Dragging brake. | |
| Slipping clutch. | |
| Overloaded. | |
| Engine stops suddenly. | Ignition trouble. |
| Engine slows down and stops. | Clogged fuel supply. |
| Incorrect Mixture. | |
| Overheated. | |
| Regular miss in one cylinder. | Defective spark plug or wire. |
| Irregular miss in all cylinders. | Sticking contact breaker. |
| Defective distributor. | |
| Clogged fuel line. | |
| Irregular fuel feed. | |
| Water in fuel. | |
| Faulty ignition connections. | |
| Engine runs unevenly. | Incorrect spark plug gap. |
| Incorrect mixture. | |
| Binding carburetor float. | |
| Sticking valves. | |
| Sticking governor. | |
| Engine overheats. | Spark retarded. |
| Faulty cooling. | |
| Faulty lubrication. | |
| Engine smokes. | Black smoke; mixture too rich. |
| Blue smoke; too much oil. | |
| Broken or stuck piston rings. | |
| Poor oil. | |
| Engine backfires through carburetor. | Mixture too lean. |
| Sticking inlet valve or weak inlet valve spring. | |
| Explosions in exhaust pipe. | Missing spark. |
| Mixture too rich. | |
| Sticking exhaust valve. | |