Reciprocating Engine Quiz Flashcards
the valves stay open too long and close too late; what wouldbe the cause of this?
too small of clearance
which is harder, the valve guide or valve stem?
valve stem
how much cooler do exhaust valves run which contain sodium?
300 to 400 degrees
how does valve timing help keep the exhaust valve cool?
through valve overlap
The valve tip And the the Valve face will have what coated on it for better Wear characteristics?
stellite
The valve seat performs What operation?
It acts as the contact points for the valves in the cylinder heads
Where is The tightest fit in the engine?
Between the exhaust Valve seat and the head
What is the opening force for the exhaust valve?
The camshaft lobe through the pushrod and rocker arm
What could happen to the valve face the induce pre-ignition?
A feathered Valve
when the valve faces are ground to less of a degree than the valve seat, what is that called?
interference fit
what is the purpose of an interference fit between the valve seat and the valve face?
provides a more positive seating
what type of lifters will you not preform a valve clearance check on?
hydraulic lifters
what measuring device will you use to check valve clearance?
feeler or thickness gauge
the valves open late and close early; what would be the cause this?
to great of a valve clearance
The head of the valve is exposed to what part of the cylinder head?
The combustion chamber
What will cause a decrease in valve Overlap?
Too great Of valve clearance
During a compression check, if you hear a hissing sound coming from the fuel metering device(carburetor) what is happening?
Leaking intake valve
If the Valves will not open far enough or stay open long enough, what is the problem?
To great valve clearance
If the valves will not open far enough or stay open long enough, what is the problem?
To great valve clearance
What is the valve clearance on systems using hydraulic lifters?
Zero
How fast is a camshaft rotate on and opposed engine?
Half the speed of the crankshaft
What prevents The valves from bouncing?
The use of multiple Springs to close the valve
What reduces the shock on the valve train?
Ramps on the lobes
What do radial engines use instead of a camshaft question ?
camring
What measurement on the valves requires you to use a radius gauge?
Valve stretch
What is the degree value of one tooth on an engine with 4 lobes and 92 Teeth ?
Thirty one point three
What is a 0 Lash lifter
Hydraulic Lifter
Which type of lifter will require splitting the crankcase?
flanged lifter
What are the 2 types of lifters?
Solid and hydraulic
Why are pushrods hollow?
To allow oil to flow to the rocker arms
When are both valves open?
End of exhaust and Beginning of intake
