Auto 140 Mid-term Review Notes Flashcards
Which part of the engine controls the way it breaths?
Intake and Exhaust Manifold?
Valve Train?
Intake Valve?
Engine Displacement?
Other than worn out Piston Rings what other things cause Oil Consumption Problems?
Bad Valve Guides or Seals
Piston Rings
Worn Compression Rings
New Valve Job
Excessive Rod Bearing Clearance
Incorrect Engine Oil Dipstick
Plugged Cylinder Head Drainback Hole
Leaking Intake Manifold Gasket
Clogged PCV (Positive Crankcase Ventilation) Valve
What is likely the Problem if you have a Rod Knock developing?
Excessive clearance at a connecting rod journal.
Flexplate or Flywheel, which one goes with which type of transmission?
Flywheels are found on vehicles equipped with manual transmissions.
Flexplates are found on vehicles equipped with automatic transmissions.
Is it a good idea to let the engine cool down before removing the head?
Yes…
Cleaning with Acids removes?
Rust and Scale
Cleaning with bases (Alkaline) removes?
Grease
Switching to aluminum heads requires?
Lowering Compression Ratio
Springs that overheat?
not sure
How many degrees is a complete 4 stroke cycle?
720 degrees for the crankshaft
Which engines fire 90 degrees apart, 120, and 180?
4 Cylinder, 180 degrees
6 Cylinder, 120 degrees
8 Cylinder, 90 degrees
What is the Ideal air fuel mixture in a combustion engine?
The stoichiometric air–fuel mixture is about 14.7:1
(i.e. for every one gram of fuel, 14.7 grams of air are required)
Detonation by overly lean mixture?
Why is the “i” head better?
The valves can stay open longer and there is more valve clearance.
If you short out the cylinder (remove the spark plug from the combustion chamber) will Rod Knock get quieter or louder?
Quieter
If you short out the cylinder (remove the spark plug from the combustion chamber) will Piston Slap get quieter or louder?
Louder
An air fuel mixture that’s too lean does what kind of damage?
What can happen if you have too much fuel in the combustion chamber?
It washes down the cylinder walls
What does carbon build up on a valve increase in a combustion chamber?
Increases the compression ratio
The less room there is in a chamber the higher the _______. The more room there is the lower_______ there is.
Compression
Slow Vacuum
Retarded Timing
How much can a spring be out of square.
Explain ignition in a Diesel Engine.
What is the difference between a short block and a long block.
List some causes of engine overheating.
Stuck Thermostat
Blown Head Gasket
Plugged Exhaust
Bad water Pump
Plugged Radiator
Retarded Timing
List the steps to perform a Compression check.
Remove spark plugs
Disable spark
Pull Fuel pump Fuse
Screw in the Compression tester that fits
Crank for the same amount of times for each cylinder
Record the reading
