Valves, Valve Gear
the purpose of an interference angle in a diesel engine exhaust valve is to
2 only, break up seat deposits.
exhaust valve timing for the engine, shown in the illustration, is to be set at 106 degree after TDC. to what portion should the flywheel be rotated to set the exhaust valve timing on the #11 cylinder. MO-0039
61 degrees
Which letter represents the top deck(valve) cover of the engine shown in the illustration MO-0122
A
The rocker arms of the diesel engine shown in the illustration are indicated by MO-0122
C and Y
The device shown in the illustration is closed by force as provided by (MO-0066)
F
The device shown in the illustration may be closed by using pressurized air on some recently built large low speed engines and would replace the component identified as (MO-0066)
F
The device shown in the illustration is opened by force as provided by (MO-0066)
Hydraulic pressure
when the #1 piston, shown in the illustration is at the top dead center the #9 piston is MO-0039
On the compression stroke
if a valve seat insert, similar to that shown in the illustration is cracked, this may be indicated by MO-0043
a white vapor in the exhaust gas
In a diesel engine, with the valves set to application, the shape of the cam determines the valve
all of the above
which of the following statements is true concerning the diesel engine valve gear shown in the illustration MO-0013
all of the above
which of the listed conditions will occur if a diesel engine exhaust valve is leaking
all of the above
Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to
assist in dissipating heat due to the extreme operating temperatures
in a 4 stroke/cycle diesel engine the intake valves open
before TDC and close before BDC
A diesel engine valve spring is under compression when the valve is
both 1 and 2
the purpose of an interference angle in a diesel engine exhaust valve is to
both 1 and 2 (set the valve quickly and break up seat deposits)
Which of the following statements is true concerning the cylinder head and valve assembly of the diesel engine MO-0013
both exhaust valves are opened simultaneously by the valve bridge
Spring surge in diesel engine valve springs can result in
bouncing of the valve gear
in a diesel engine, the spring force required for proper valve operation is determined by
cam contour
The device labeled B in the illustration is a MO-0122
camshaft rotating at the speed of the crankshaft
Diesel engine valve springs function to
close the valves
the easiest way to locate a defective diesel engine exhaust is by
comparing exhaust pyrometer readings
the closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by
compressed air pressure
The satisfactory operation of diesel engine exhaust valves usually depends on
correct timing and proper seating
The burning of oil fuel oil in a diesel engine having a high sodium content will cause
corrosion and grooving of exhaust valves
if you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be
cracks in the surface of the spring
on a 4 cycle diesel engine., the valve subjected to the most severe conditions during normal service is the
cylinder exhaust valve
what will cause valve stem blow-by to the valve section shown in the illustration MO-0030
defective rubber seal rings in the valve guides
worn diesel engine intake valve guides can result in
excessive lube oil consumption
If there is a clicking sound in the valve compartment of a diesel engine, the cause may be
excessive valve lash
Excessive lubricating oil consumption in a running diesel engine can be caused by
excessive valve-guide clearance
Valve rotators are commonly used on which of the listed diesel engine cylinder head valves
exhaust
the parts labeled I and II shown in the illustration are respectively identified as the MO-0022
exhaust and intake valve
a burned exhaust valve may be detected by a higher than normal
exhaust temperature may from a particular cylinder
The diesel engine component labeled Z shown in the illustration is called the MO-0122
exhaust valve spring
valve cages are used on some large diesel engine to
facilitate valve removal for servicing
broken intake valve springs on one cylinder of a diesel engine can cause the engine to
fire improperly
Which of the listed design features is found in an exhaust valve and not in an intake valve
hard alloy steel construction
the valve spring shown in the illustration, functions to MO-0073
hold the valve against its seat
The opening of an exhaust valve on a modern, large, low-speed, main propulsion diesel engine may be actuated by
hydraulic "push rods"
the valve shown in the illustration operates by which of the following principles (MO-0066)
hydraulic pressure opens the valve
turbocharged 4 stroke/cycle diesel engines utilize valve overlap to
improving cylinder scavenging
diesel engine exhaust valve spring to close the diesel engine valves are
in any position
Excessive wear at part #11, shown in the illustration would result in MO-0027
increased oil consumption
excessive wear at part #11 shown in the illustration would result in MO-0027
increased oil consumption
in comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because
intake valves are less affected by the corrosive action of exhaust gasses
in comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy mild steels because
intake valves at lower temperatures due to the cooling effect of the intake air flow across the valve
in comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because
intake valves operate at much lower temperatures and are less affected by the corrosive action of exhaust gasses
when one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will be indicated
leaky exhaust valve
worn cylinder head valve seats in a diesel engine will cause
less cold valve lash
in a four stroke/cycle diesel engine,, badly worn intake valve guides can cause excessive
lube oil consumption
A sudden drop in diesel engine cylinder compression pressure can be caused by
malfunction valves
which of the listed reasons is the most likely cause of a sudden drop in compression pressure in one diesel engine cylinder
malfunction valves
in a diesel engine, a leaking exhaust valve can cause
misfiring
During the process of cylinder scavenging, the size of the exhaust valve opening is
most critical in a two stroke/cycle diesel engine
The inlet valves for the diesel engine shown in the illustration are indicated by the letter or number MO-0122
none of the above
The diesel engine rocker arm shown in the illustration serves to MO-0122
open the exhaust valves and operate the unit injectors
the diesel engine rocker arm shown in the illustration serve to MO-0122
open the exhaust valves and operate the unit injectors
which of the following statements identifies the purpose of the valve bridge shown in the illustration MO_0019
operate 2 exhaust valves from one rocker arm
Multiple concentric valve springs are often used with diesel engine valves to
operate the valve gear where a larger force is normally required but space limitations restrict the use of a single large spring
In the chart shown in the illustration, a right hand rotation engine has the #9 piston on top dead center, therefore the #1 piston will cause MO-0039
power stroke
from the chart shown in the illustration, if a right hand rotation engine had the #9 piston on top dead center the #8 piston would be on the MO_0039
power stroke
valves in the cylinder head of a diesel engine are opened by the direct action of the
rocker arm movement
The force exerted by a valve spring to close the diesel engine valves, is proportional to
spring compression
the intake and exhaust valves used in a diesel engine are returned to their seats by
spring force
bouncing of the valve gear in a diesel engine can be caused by
spring surge
excessively worn, or polished ends on a diesel engine valve spring, indicate
spring surge
The line identified as "I" in the illustration is used to (MO-0066)
supply lubricating oil for actuating the exhaust valve
the line identified as "I" in the illustration is used to MO-0066
supply lubricating oil for actuating the exhaust valve
The use of push rods becomes necessary in a diesel engine when
the camshaft is located some distance below the valve gear
which of the following statements is true concerning the diesel engine cylinder head and valve mechanism shown in the illustration (MO-0013)
the rocker arm causes a valve bridge to open the valves simultaneously
A built up exhaust valve is one in which
the stem and head is made of different materials
which of the following statements describes the operational characteristics of figure B in the illustration MO-0045
the valve will lift abruptly and reseat gradually
The valve bridge, illustrated allows for MO-0019
two exhaust valves to be operated from one rocker arm
The valve stem expansion associated with engine warm up is allowed for by the
valve lash adjusters
which of the listed construction characteristics is apparent of the diesel engine shown in the illustration MO-0005
valve lash is mechanically adjusted
when would a diesel engine exhaust valve spring under the greatest compression load
when the valve is fully open
when checking the underside of the valve cover shown in the illustration, you find localized black patches. you should suspect MO-0043
worn exhaust valve guides and seals
Which of the following problems represents one possible cause of high lube oil consumption in a four stroke diesel engine
worn intake valve guides