Engine And Engine Support Systems Flashcards
What is the freeze point of 50/50 coolant
-37c
What does it mean if both heater core hoses are hot to the touch
Normal condition
Metal in engine cooling passages caused by
Electrolysis from lack of coolant replacement
If a thermometer heater element has a open circuit what would be the result
The engine will run at normal operating temperature
A engine overheats before and after a thermostat replacement and no external leaks are found what would cause this
A bad water pump
Bubbles coming from the over flow
Bad head gasket from combustion entering the cooling system
What does a coolant temp sensor read when disconnected
-40
A electric cooling fan runs on high at all times
Fan relay is stuck closed
What’s a good minimum oil pressure
10 psi per 1000 rpm hot
What oil pump can vary output volume
Vane
What clearance measurement is needed in a generator oil pump
Inner to outer tip to tip clearance
White streaks on the engine oil dip stick indicate
Coolant is entering the oil
Copper flakes are found in engine oil
Crankshaft bearing wear
Fluctuating oil pressure gauge is from
Overfilled engine oil (air in oil)
Engine makes rattle noise when throttle is snapped but goes away when engine is in gear
Cracked flex plate
Popping noise is heard from intake manifold when spark is disabled from the one cylinder the noise lessens
Faulty intake valve
Puff of blue smoke when the vehicle leaves stop sign
Bad valve seals
Runs smooth when cold but knocks when warm
Worn connecting rod bearings
Clatter from cylinder block noise is not affected by temp or spark removal
Seized wrist pin
Continuous noise of steel rubbing in metal at front of engine
Stretched timing chain
Decrease in oil pressure over several years of engine life
Increasing engine internal clearance
Bell like sound from cold engine as it warms it goes away
Collapsed piston
Double knock sound at idle that is not temp affected
Worn wrist pins
What is an unacceptable leak down reading
20%
What do you need between cylinders on a compression test
Difference of no more then 20%
Misfire on pushrod engine
Stripped rocker stud
Quick way to find if valves are bent if a timing chain brakes
Valve stem height is not uniform
Exhaust valve has carbon build up on stem
Valve guid is worn
Valve to guide tolerance
.005”
When adjusting hydraulic lifters where should the lifter be positioned on the crankshaft
On the lone heel
Difference between bucket and roller follower
Bucket must spin in the lifter bore
