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