Engine mechanical diagnostics, cylinder head, valvetrain, lubrication and cooling systems.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What does a compression test measure?
Show answer
The amount of pressure the engine cylinders can build during the compression stroke.- Define blow-by in engine diagnostics.
Show answer
Combustion gases escaping past the piston rings into the crankcase.- What does blue smoke from the exhaust indicate?
Show answer
Oil burning in the combustion chamber, usually from worn piston rings or valve seals.- What does white smoke from the exhaust indicate?
Show answer
Coolant entering the combustion chamber, typically from a blown head gasket or cracked block.- What does black smoke from the exhaust indicate?
Show answer
Rich fuel mixture with too much fuel or too little air in the combustion chamber.- What causes excessive valve train noise?
Show answer
Worn valve lifters, excessive valve clearance, or worn cam lobes.- What does a leak-down test reveal?
Show answer
Where piston rings are leaking by measuring the rate of air loss past them into the crankcase.- What is the primary purpose of the cylinder head?
Show answer
To seal the top of the cylinders and house the valves, combustion chamber, and cam mechanism.- What are valve seats?
Show answer
The sealing surfaces on the cylinder head where the valve faces make contact to seal the combustion chamber.- Define valve overlap.
Show answer
The period when both intake and exhaust valves are open at the same time during the valve timing cycle.- What is valve margin?
Show answer
The thickness of metal between the valve face and the outer edge of the valve head.- What causes valve seat wear?
Show answer
Repeated opening and closing of the valve against the seat, combustion heat, and corrosive combustion byproducts.- What does valve recession mean?
Show answer
The valve sitting lower in the cylinder head than normal due to erosion and wear of the valve seat.- What is the combustion chamber?
Show answer
The enclosed space above the piston where the fuel mixture is ignited and burns.- What is a cam follower or valve lifter?
Show answer
The component that rides on the cam lobe and opens and closes the valve as the cam rotates.
FlashKeepers