Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
The purpose of the exhaust manifold is to: |
Collect the exhaust gas |
|
|
When testing back pressure in an exhaust system, what would be the normal pressure reading for a good exhaust system with the engine operating at 1800 RPM? |
1 psi |
|
|
How would you determine if a catalytic converter is functioning correctly |
Using a temperature gauge or instrument, the temperature at the outlet of the converter should be at least 38c (100F) greater than the temperature at the inlet of the converter |
|
|
What is the main function of the cooling system |
The main function of the cooling system is to regulate the engine temperature |
|
|
What is the most common type of thermostat |
Wax pellet |
|
|
List the three types of cooling systems |
Air cooled system Liquid cooled open system Liquid cooled closed system |
|
|
What are two popular coolant products? Which is safer for the enviroment |
Eythlene glycol Propylene glycol Propylene glycol is safer because it is not toxic or as hazardous on the environment |
|
|
What is the function of the radiator cap? |
The radiator caps purpose is to raise the pressure above atmospheric pressure in the cooling system. This increase in pressure raises the boiling point temperature of the coolant |
|
|
Explain two possible results from a coolant leak into the engine and lubrication system |
A) if coolant gets into a cylinder, a hydraulic lock could result and lead to catastrophic damage of the piston, connecting rod and cylinder head B) if coolant mixes with the engine oil, bearings and components are damaged |
|
|
List five functions of the lubrication system |
Reduce friction To cool To seal To clean To absorb loads (quiets) |
|
|
What are the three methods of lubrication |
Splash Splash and pressure Full pressure |
|
|
What designs of pump are used in engines main lubrication system |
The oil pumps used on the engines main lubrication system are positive displacement rotary pumps. The most common type is the external gear type, but vane, internal gear and gerotor pumps are also used |
|
|
Name two oil filtration systems |
Full flow filtration systems Bypass filtration systems |
|
|
State the purpose of a pre-lube pump |
The purpose of the pre-lube system is to get oil to the critical parts of the engine and lubricate them before the engine is turned over |
|
|
Explain the purpose of a post lube pump |
The post lube system is run for a few minutes after the engine is shut down. This is done to cool down the engine and components and to lubricate turbocharger bearings as the turbo winds down |
|
|
Why is it important to do regularly scheduled oil analysis |
Lube oil analysis is used to determine the condition of the oil and wear in the engine. It is recommended that samples for testing to be taken at regular scheduled intervals and prior to maintenance shut downs |
|
|
An oil pump relief valve stuck open would cause _____oil pressure |
Low |
|
|
Explain the main purpose for the crankcase ventilation system |
The crankcase ventilation system removes combustion gases and water vapours from the crankcase |
|
|
Due to emission standards, where should crankcase gases be directed |
Crankcase gas is vented to the atmosphere in a passive system. On a pressurized system the crankcase gas may be sent to the intake manifold, inlet of the turbo charger or to a Venturi in the exhaust system (positive system should be used) |
|
|
What instrument is commonly used to check the crankcase ventilation system? |
A manometer |
