Engines Flashcards
Insufficient valve clearance?
a. Carbon build up b. Sticky valves c. Rough running d. Bent push rod
c. Rough running
What causes a broken piston ring?
a. Ring Ridge b. Detonation c. Ping d. Foreign material
a. Ring ridge
During a cylinder leak down test, the cylinder should be less than 20% leakage, TDC and:
a. Compression b. Power c. Exhaust d. Intake
a. Compression
When should vacuum readings be the highest?
a. Acceleration b. Deceleration c. Cruise d. Braking
b. Deceleration
What would the vacuum reading be for a vehicle with a plugged exhaust?
a. Normal b. Very low c. Very high d. Normal and gradually drops down to close to zero vacuum
d. Normal and gradually drops down to close to zero vacuum
When torquing a cylinder head, what is the procedure?
a. Start at the outside bolt and work your way in b. Start at one side and end at the other side c. Stat at the middle of the cylinder head and work outwards d. Start at the left side of the cylinder head and work to right side of the cylinder head
c. Start at the middle of the cylinder head and work outwards
A timing belt has stretched. What should you do?
a. Replace b. Readjust c. Do not touch d. All of the above
a. Replace
What causes a vehicle to backfire on load through the intake manifold?
a. Worn exhaust camshaft lobes b. Worn intake valves c. Worn exhaust valves d. Worn intake camshaft lobes
c. Worn exhaust valves
really? I thought b. Worn intake valves
If the cylinder block has gouges in the cylinder bores, what would be the procedure to repair it?
a. Replace cylinder block b. Re-hone one cylinder bore to the next size c. Re-hone all cylinder bores to the next size d. Install one cylinder sleeve
a. Replace cylinder block
What is the procedure to check for run out on a crankshaft and camshaft?
a. Dial indicator b. V blocks and a dial indicator c. Vernier caliper d. V blocks and vernier caliper
b. V blocks and dial indicator
What happens to the cylinder head when it is machined 0.020”?
a. Decrease in timing b. Increase in timing c. Less torque d. More torque
a. Decrease in timing
Torque to yield bolts are re-usable how many times?
a. Once b. Twice c. Three times d. Four times
a. Once
Fluctuating oil pressure reading can be caused by:
a. Lack of oil b. Oil temperature is too high c. Oil pressure regulator is sticking d. Oil cooler is plugged
a. Lack of oil
When using a smoke type leak detector to locate a vacuum on an engine, the engine must:
a. Be at running temperature b. Not be running c. Be at room temperature d. Have the air cleaner removed
b. Not be running
As engine speed increases, the ignition timing must be (blank) to provide sufficient burn time for the air fuel mixture.
a. Retarded b. After top dead center c. Advanced d. Kept constant
c. Advanced
Tempering is used to:
a. Make steel more workable and improves toughness b. Remove internal stress c. Harden a part d. None of the above
c. Harden a part
Exhaust ports should have a smooth surface:
a. To improve air flow b. To reduce carbon build up c. To reduce exhaust emissions d. To improve fuel economy
a. To improve air flow
Excessive engine oil pressure could be caused by:
a. Overfilled crankcase b. Plugged oil filter c. Relief valve that is stuck closed d. Worn engine bearing
c. Relief valve that is stuck closed
What could be the cause of a broken piston ring?
a. Worn piston lands b. Rings' end gap clearance c. Worn cylinder sleeve d. Stuck thermostat
a. Worn piston lands
A vehicle has an overheating problem in stop and go traffic. What is the most likely cause?
a. Plugged radiator b. Inoperative fan c. Pinched radiator tubing d. Improper coolant mixture
b. Inoperative fan
Low and steady vacuum gauge readings can be caused by:
a. Broken booster vacuum leak b. Intake valve leak c. Incorrect fuel mixture d. An exhaust restriction
c. Incorrect fuel mixture
What would be the cause of anti-freeze leaking on the passenger side of the passenger compartment?
a. AC evaporator b. Heater core c. AC condenser d. Heater fan motor
b. Heater core
What tool do you use to measure warpage of a cylinder head?
a. Dial indicator b. Straight edge and feeler gauge c. Ball micrometer d. Vernier calipers
b. Straight edge and feeler gauge
If a flex plate is cracked, what could be the cause?
a. Over tightened torque converter bolts b. Misaligned bell housing to motor c. Starter engagement d. Starter disengagement
b. Misaligned bell housing to motor
What is the boiling point of coolant raised to with a 14 psi radiator cap?
a. 0-10 C (0-20 F) b. 11-22 C (21-42 F) c. 23-30 C (43-63 F) d. 31-40 C (64-84 F)
b. 11-22 C (21-42 F)
How would you check an engine oil pump for wear?
a. Dial indicator b. Caliper c. Feeler gauge and straight edge d. Vernier caliper
c. Feeler gauge and straight edge
When replacing a piston ring with a tapered piston bore, what should be done first?
a. Hone and clean bore b. Wipe piston with oil c. Bore, hone, and clean bore with solvent b. Bore, hone, and clean bore with soap and water
d. Bore, hone, and clean bore with soap and water
A vehicle window has condensation on the inside of the vehicle and the passenger side floor is wet. What is the cause?
a. Vent doors are seized open b. The evaporator drain hole is plugged c. Heater core is leaking d. Receiver drier not working
b. The evaporator drain hole is plugged
The windshield defrost is on and the windshield starts to fog up. What could be the cause?
a. Heater core leaking b. Evaporator c. Heater valve not working d. Thermostat not opening
a. Heater core leaking
What is the preferred coolant mixture?
a. 50% water and 50% ethylene glycol b. 50% distilled water at 50% ethylene glycol c. 70% water and 30% ethylene glycol d. 30% water and 70% ethylene glycol
b. 50% distilled water and 50% ethylene glycol
If the coolant in a cooling system is at 0 C, What mixture of coolant would you add to make it -35 C?
a. 50% antifreeze and 50% water b. 70% antifreeze and 30% water c. 30% antifreeze and 70% water d. 50% antifreeze and 50% distilled water
d. 50% antifreeze and 50% distilled water
