| A | B |
|---|
| Which color of engine smoke can indicate an overly rich fuel mixture? | Black |
| The air/fuel charge enters the combustion in a _____ state. | Vapor |
| True/False When the intake valve opens the air passage to the carburetor, the higher outside atmospheric pressure flows into the lower pressure of the cylinder. | True |
| True/False During the power stroke the expanding gases force the top ring on the piston against the cylinder wall. | True |
| True/False What maybe sufficient valve clearance at low temperature may become insufficient clearance at high temperature. | True |
| True/False WHen an engine has a compression ratio of 6:1, it means that the volume of the crankcase is 1/6th as much when the piston is closest to the crankshaft than it is when the piston is furthest from the crankshaft. | False |
| True/False The compressing of the charge does not aid the air/fuel flow into the combustion chamber. | True |
| True/False The narrower the margin, the longer the valve life? | False |
| True/False The compression ratio of an engine is decreased when a large volume of combustion deposits accumulate in the engine. | False |
| Name the 3 rings that are commonly found on Briggs & Stratton pistons. | Oil Control Ring, Compression Ring, Wiper Ring |
| The two common cylinder wall finishes that are used on Briggs & Stratton engines are: | Diamond Bore & Crosshatch |
| If the exhaust valve face shows any signs of pitting, burning, or evidence of a valve seat impression | Replace the valve |
| Often when the customer makes the statement that the engine is hard to start, it is an indicator of: | Low power |
| The simplest way to isolate crankcase breather problems is by ______ or leak-down testing | Testing for crankcase vacuum |
| Which ring prevents the majority of the expanding compression gases from getting past the piston into the crankcase? | Compression |
| A valve seat can damage from: | Carbon deposits, Corrosive combustion chemicals, Debris |
| During the upstrokes of the piston, what occurs within the crankcase? | A low pressure area is created |
| During the compression stroke, what is the position of the intake valve? | Fully closed |
| The ______ ring contacts the oil thrown out by the lubercation system and the crankshaft, wiping away large volumes of oil from the cylinder wall. | Oil control |
| Which ring provides a controlled film of oil to lubricate the compression ring? | Wiper |
| What is the most common valve failure that affects compression? | Degradation of the valve face and the valve seat surface |
| why must the "charge" in the combustion chamber be compressed before ignition | Improved vaporization of fuel and air |
| If an exhaust valve leaks during engine operation maverick air is drawn into the combustion chamber causing a lean air-fuel mixture. What symptoms will a leaking exhaust valve cause during engine operation. | The engine maybe difficult to start. The engine may exhibit a loss of power. |
