Heads and Valves Quiz

When removing valve springs, it may be necessary to tap the retainer with a soft-faced hammer to:

release the valve from the guide

help compress the spring

loosen the valve locks from the retainer

remove the valve oil seal

Correct! Wrong!

Injector sleeves/tubes are usually made from:

cast iron

copper

aluminium

babbit

Correct! Wrong!

Valves cross-heads (valve bridges) are used to:

Please select 2 correct answers

open four valves using one rocker arm

open two valves using one rocker arm

prevent valve stern wear

bridge the gap between the valve and injector.

Correct! Wrong!

When grinding valves and seats, the one degree interference angle refers to the angle between the valve:

and it''s guide

margin and it''s seat

face and it''s seat

seat and the head

Correct! Wrong!

Cylinder head fasteners should be loosened from the:

outside of the head, working inward

center of the head, working outward

left side, working towards the right side

center of the head in no particular order

Correct! Wrong!

The dimension shown below illustrates what portion of a valve seat?

valve seat lower edge width

valve seat upper edge width

the valve seat width

valve seat degree angle

Show hint

Correct! Wrong!

A valve with excessive runout should be:

straightened

replaced

reused

reground

Correct! Wrong!

If a cylinder head has been resurfaced, the amount of material removed should be stamped on:

the engine ID plate

a non-sealing area of the cylinder head

the machined head gasket surface

a non-sealing area of the engine block

Correct! Wrong!

Valve seat inserts can be removed by:

welding a bead around the counterbore

using a cape chisel and a hammer

using a collect type insert puller

heating the cylinder head with a torch

Correct! Wrong!

When measuring the cylinder head for warpage with a straightedge, the feeler gauge measurement is 0.025 in. (0.63 mm). The general rules for head reconditioning are: Technician A says that the cylinder head needs to be resurfaced. Technician B says that the measurement is within tolerance for all manufacturers. Who is right?

A only

B only

Both A and B

Neither A nor B

Show hint

Correct! Wrong!

Engine valve springs should be inspected for all of the following EXCEPT:

cracks

spring tension

pitting and nicks

spring coil gap

Correct! Wrong!

Technician A says to inspect the valve spring retainers for cracks, discoloration and wear. Technician B says that it is good practice to replace all of the valve spring retainers when the valves are serviced. Who is right?

A only

B only

Both A and B

Neither A nor B

Show hint

Correct! Wrong!

What preparation must be done to the valve guides before measuring valve seat run out?

Use 30 weight engine oil to lubricate the guide.

Clean the valve guide with a bore brush.

Ream the valve guide to its original diameter.

Use a pilot to hold the guide in place.

Correct! Wrong!

When grinding valves and seats, if a valve lap mark is too close to the margin of the valve:

lower the seat by using a 15 degrees stone

raise the seat by using a 45 degree stone

replace the valve

replace the seat

Correct! Wrong!

When grinding valves and seats and restoring or replacing valve guides, the correct order of service is:

grind the valve, then grind the seat, then service the guide

grind the seat, then grind the valve, then service the guide

service the guide, then grind the seat, then grind the valve

service the guide, then grind the valve, then grind the seat

Correct! Wrong!

Valve springs should be checked for:

tension and free length

squareness

stretch

both A and B

Correct! Wrong!

Insufficient valve head height (below specifications) causes:

a reduction in compression ratio

an increase in compression ratio

insufficient valve face contact

piston to valve contact

Correct! Wrong!

Valve guides are classified as:

welded or threaded in place

cast iron or aluminum

internally or extremely threaded

integral or replaceable

Correct! Wrong!

Worn rocker arms, shafts and crossheads would most likely cause:

oil consumption

bent push rods

excess valve train noise

piston to valve contact

Correct! Wrong!

Valve spring that measure greater that 1/16 in. (1.6 mm) out of square should be:

straighened

rotated 180 degrees and reinstalled

tested for tension to determined reusability

replaced

Correct! Wrong!

As the installed height of a valve spring increases, the valve spring tension:

increases

decreases

stays constant

compensates for the change

Correct! Wrong!

Cross-heads must be carefully adjusted to ensure that:

push rods are not bent

valve clearance is not affected

the valves do not hit the piston

both valves open at precisely the same time

Correct! Wrong!

Technician A says that when removing push tubes, you should check to see if they are filled with oil, and discard them. Technician B says that you should check push tubes to see if they are straight and check the ends for wear. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

The most common material used for diesel engine cylinder head construction is:

stainless steel

aluminum alloy

cast iron alloy

steel alloy

Correct! Wrong!

The purpose of the coolant and oil passages in the cylinder head is to:

route the coolant and oil to the turbocharger

route the coolant and oil to the cylinder head and its components

route the coolant and oil from the cylinder head to the block

act as a reservoir

Correct! Wrong!

The purpose of a carbon scraper on a valve is to prevent carbon buildup:

on the valve face

on the valve seat

on the lower part of the valve guide

on the valve stem and fillet

Correct! Wrong!

A valve spring seat or shim is used to:

locate the valve into proper position and keep it centered in the guide

prevent erosion of the retainer and valve locks

retain the valve spring in its proper location during assembly

prevent erosion of the cylinder head where the spring would contact the casting

Correct! Wrong!

When compared to an integral valve seat, valve seat inserts provide a replaceable wear surface with improved:

airflow

heat rejection

wear characteristics

sealing characteristics

Correct! Wrong!

Valve seals control valve guide and stem lubrication to prevent:

valve seizure

valve stem wear

valve guide wear

oil consumption

Correct! Wrong!

The overhead camshaft design:

eliminates the need for push rods

reduces the length of push rods

eliminates the need for valves

reduces the size of the cylinder head casting

Correct! Wrong!

Which of the following statements is true about cylinder head retaining studs?

studs aid in the removal of the cylinder head

studs increase block distortion when torquing

studs provide a higher clamping force than cap screws

studs allow increased access to the block after cylinder head removal

Correct! Wrong!

Bent valves may be caused by piston striking them:

True

False

Correct! Wrong!

Valve seats can be checked for looseness by:

using a magneflux device

using a spray penetrant and developer

tapping with a ball peen hammer

feel

Correct! Wrong!

Technician A says that valve rotators turn the valve to help remove deposits and help valve and seat wear uniformly. Technician B says that if the valve rotators seize and fail to rotate, the engine will quickly fail because of valve damage. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Show hint

Correct! Wrong!

Technician A says that valve guides must be inspected and in good condition or replaced prior to cutting or grinding the valve seat. Technician B says that valve seat inserts should be staked with a center punch to secure them into the head after installation. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

Pushrods are commonly found as being tubular in construction. Tubular rods are used because:

the rods are cheap to manufacture and inexpensive to purchase

the rods are much stronger because the tubes increase strength

the rods are lighter in weight and reduce valve train inertia

the rods are only used because a mechanical engineer thought it was a good idea

Correct! Wrong!

The margin of a valve refers to the:

distance from the valve face to the top outer surface of the valve head

width of contact where the valve face contacts the valve seat

contact surface where valve meets valve seat

difference of the valve head diameter compared to seat diameter

Correct! Wrong!

The part of the valve known as the valve face is:

A

B

C

D

Show hint

Correct! Wrong!

The part of the valve where mechanics would check for valve chamfer is:

A

B

C

D

Show hint

Correct! Wrong!

A location where an interference angle would be found is:

A

B

C

D

Show hint

Correct! Wrong!

Hollow pushtubes that are found to have oil inside would be an indication that:

an end of the tube may be cracked and the push tube should be replaced

the engine is running excessive oil pressure

oil drain back passages may be restricted

this is a normal condition and the pushtube may be reused

Correct! Wrong!

Which instrument(s) should be used to measure wear in the valve guides?

outside micrometer

telescoping gauge and outside micrometer

small hole gauge and outside micrometer

depth micrometer

Correct! Wrong!

Technician A says that a valve seat should be ground prior to changing a worn valve guide. Technician B says that valve guides should be inspected for wear, taper and out of round. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

To adjust the valves and injectors on a Cummins engine, position the engine on:

valve overlap for that cylinder

TDC for that cylinder

the intake stroke

the VS marks

Correct! Wrong!

Why might it be necessary to remove valve seat inserts in order to surface grind a cylinder head?

the inserts may be above the deck

the inserts may be of a harder material

mechanics need to practice valve seat removal

valve seats mounting surfaces need to be checked

Correct! Wrong!

These pushrods should be inspected for:

straightness, damage or wear, and fluid in the tube

straightness, wear on the ends, cracks

wear on the ends, cracks, overall length

wear on the ends, cracks, overall length and diameter

Show hint

Correct! Wrong!

When glass beading valves, the head can be glass beaded but not the stem, the reason for this is:

the stem will be weakened and will break

guide wear will be accelerated

the valve will not seat properly

the margin will be reduced

Correct! Wrong!

If a valve seat is not properly installed low enough into the head, what will NOT be a factor?

clearance volume will be decreased

the valve may overheat

the seat will not cool properly

valve spring tension will be reduced

Correct! Wrong!

Technician A says the valve stem must be measured at the top, middle, and near the fillet. Technician B says many modern engines use tapered stems to provide additional clearance between the stem and guide close to the head of the valve. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Reconditioning valves is being discussed. Technician A says the valve is stroked across the stone as the valve is being fed in. Technician B says when the last pass is complete, you back the valve away from the stone. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Technician A says that a worn out valve guide will provide an inaccurate valve seat run out measurement. Technician B says that the valve seat to valve face contact area provides a path for heat from the valve head to dissipate. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Technician A says that if a valve spring shim is used, install the serrated side toward the spring. Technician B says to determine required shim thickness, the measured distance is subtracted from the specifications. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Technician A says that the pushrods can be checked for straightness by rolling them on a known flat surface. Technician B says that if a push-rod is bent, but cannot be seen by the eye, it will not cause a problem. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

When adjusting valve clearances, Technician A says that feeler gauge should slide with slight resistance. Technician B says that on some applications, the intake valve clearance is less than the clearance for the exhaust valve. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

What type of component failure can cause vacuum gauge fluctuations between 7 and 20 in. Hg?

Weak valve springs

Burned intake valves

A leaking head gasket

Burned exhaust valves

Correct! Wrong!

How can it be determined during a cylinder leakage test if one or more of the intake valves are not sealing?

Air can be heard escaping from the tallpipe

Air can be heard escaping from the PCV valve opening

Air escaping from the air intake at the engine

Bubbles in the engine coolant

Correct! Wrong!

Technician A says that no matter what condition the cylinder is in, it is always more cost effective to repair the cylinder head rather than replacing it. Technician B says that properly welding cylinder head cracks can save the customer the cost of a new or re-manufactured one. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

While discussing valve spring testing, Technician A says that spring tension should be within 30 percent of the manufacturer''s specifications. Technician B says that there should be no more than 10 pounds difference between the springs. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

What is most likely to happen if a valve spring is not square?

The valve stem will warp.

The valve spring will crack.

The valve guide will be side loaded and cause premature wear.

The free length of the valve spring will be altered.

Correct! Wrong!

While inspecting the engine valves, what should the valve lock grooves be inspected for?

Carbon deposits

Thickness of grooves

Flat spots on the valve face

Uneven shoulders

Correct! Wrong!

In the figure below, what is the purpose of the function being performed?

To measure valve margin thickness

To indicate valve guide wear

To measure valve seat concentricity

To measure valve seat run out

Show hint

Correct! Wrong!

While resurfacing the engine valves, what can indicate if the grinding stone needs to be dressed?

When pieces of the dressing stone are missing

After using the stone to condition 40 to 60 valves

If the oil supply does not cool the stone properly

If the valve chatters during the resurfacing process

Correct! Wrong!

All of the following are true regarding valve seat resurfacing EXCEPT:

lift the grinding stone on and off at the rate of 120 times per minute.

worn valve guides must be replaced before attempting to grind any seats.

only remove enough material to provide a new surface.

apply pressure to the grinding stone.

Correct! Wrong!

Technician A says to measure the valve seat width accurately, the minimum tool requirement would be with a machinist''s scale. Technician B says to remove material according to the position of the valve face to valve seat width measurement. Who is right?

A only

B only

Both A and B

Neither A nor B

Show hint

Correct! Wrong!

While assembling the valve train components, Technician A says to polish the valve stems with 240 grit sandpaper. Technician B says to lubricate the valve stems with assembly lubricant, or at least with clean engine oil. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Rocker arms are commonly made of all of the following EXCEPT:

cast iron.

stamped steel.

titanium

aluminum.

Correct! Wrong!

While inspecting a rocker arm shaft, it is found to be galled and scored. Technician A says that wear in that location indicates there was a lack of lubrication. Technician B says that the shaft itself cannot be checked for straightness. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

In the figure below, what is the arrangement used to adjust the valve clearance?

Adjusting nut that retains the rocker arm to a rocker arm stud

An adjustable screw that follows the camshaft

Adjustable pushrods

An adjustable screw in the end of the rocker arm

Show hint

Correct! Wrong!

The figure below shows the technician is replacing which part of the head?

Valve seat

Valve guide

Valve stem

Valve guide seal

Show hint

Correct! Wrong!

The term used to describe the opening of the intake valve before the exhaust valve has fully closed is known as:

cam advance

valve overlap

interference adjustment

lifter timing

Correct! Wrong!

The function of coolant directors in the cylinder head is to:

direct coolant to the hottest area

improve water pump capacity

allow for a quick return of coolant to the radiator

prevent coolant from flowing to the water manifold

Correct! Wrong!

When resurfacing valves and seats on a cylinder head, Technician A says that valve stems do not require resurfacing. Technician B says that there is no need for an interference angle between the valve and the seat. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

Technician A says the amount of material removed from the valve face is the size or thickness of the required valve spring shim. Technician B says shims are required to compensate for the increased valve stem tip height because of the valve and seat resurfacing. Who is right?

A only

B only

Both A and B

Neither A nor B

Show hint

Correct! Wrong!

Valve seat inspections is being discussed on a large diesel engine. Technician A says if the valve seat is not within specification, the cylinder head must be replaced. Technician B says seat run out is a measure of how concentric the valve is in relation to the valve guide. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

All of the following are considerations when grinding valve seats EXCEPT:

dress the stone before cutting any seat.

remove only enough material to provide a new surface.

use transmission fluid to lubricate the stone only.

do not apply pressure to the grinding stone.

Correct! Wrong!

When rebuilding an engine head, Technician A says that proper valve seat concentric is critical for a proper seal, and a usual tolerance for seat run out is 0.002 in. (.50 mm). Technician B says that not only does the valve to seat contact provide an airtight seal but also a path for heat to dissipate. Who is right?

A only

B only

Both A and B

Neither A nor B

Correct! Wrong!

How is a valve stem height corrected?

By removing material from the valve tip

Adding shims

Installing a valve spring that is the correct height

Removing material from the valve seat

Correct! Wrong!

Valve overlap is the total degrees of duration:

of the intake

including clearance ramps

While both exhaust and intake valves are open

while both exhaust and intake valves are closed

Correct! Wrong!

Why are lifters offset on a camshaft?

quieter operation

to reduce flutter at higher RPM

to reduce wear

to rotate the lifters

Correct! Wrong!

If a valve seat is not installed low enough in the head what will result:

clearance volume will be decreased

the piston will contact the valve

the valve will not cool properly

valve spring tension will be reduced

Correct! Wrong!

When removing valve springs, it may be necessary to tap the retainer with a soft-faced hammer to:

Injector sleeves/tubes are usually made from:

Valves cross-heads (valve bridges) are used to:

When grinding valves and seats, the one degree interference angle refers to the angle between the valve:

Cylinder head fasteners should be loosened from the:

The dimension shown below illustrates what portion of a valve seat?

A valve with excessive runout should be:

If a cylinder head has been resurfaced, the amount of material removed should be stamped on:

Valve seat inserts can be removed by:

Engine valve springs should be inspected for all of the following EXCEPT:

Technician A says to inspect the valve spring retainers for cracks, discoloration and wear. Technician B says that it is good practice to replace all of the valve spring retainers when the valves are serviced. Who is right?

What preparation must be done to the valve guides before measuring valve seat run out?

When grinding valves and seats, if a valve lap mark is too close to the margin of the valve:

When grinding valves and seats and restoring or replacing valve guides, the correct order of service is:

Valve springs should be checked for:

Insufficient valve head height (below specifications) causes:

Valve guides are classified as:

Worn rocker arms, shafts and crossheads would most likely cause:

Valve spring that measure greater that 1/16 in. (1.6 mm) out of square should be:

As the installed height of a valve spring increases, the valve spring tension:

Cross-heads must be carefully adjusted to ensure that:

Technician A says that when removing push tubes, you should check to see if they are filled with oil, and discard them. Technician B says that you should check push tubes to see if they are straight and check the ends for wear. Who is correct?

The most common material used for diesel engine cylinder head construction is:

The purpose of the coolant and oil passages in the cylinder head is to:

The purpose of a carbon scraper on a valve is to prevent carbon buildup:

A valve spring seat or shim is used to:

When compared to an integral valve seat, valve seat inserts provide a replaceable wear surface with improved:

Valve seals control valve guide and stem lubrication to prevent:

The overhead camshaft design:

Which of the following statements is true about cylinder head retaining studs?

Bent valves may be caused by piston striking them:

Valve seats can be checked for looseness by:

Technician A says that valve rotators turn the valve to help remove deposits and help valve and seat wear uniformly. Technician B says that if the valve rotators seize and fail to rotate, the engine will quickly fail because of valve damage. Who is correct?

Technician A says that valve guides must be inspected and in good condition or replaced prior to cutting or grinding the valve seat. Technician B says that valve seat inserts should be staked with a center punch to secure them into the head after installation. Who is correct?

Pushrods are commonly found as being tubular in construction. Tubular rods are used because:

The margin of a valve refers to the:

The part of the valve known as the valve face is:

The part of the valve where mechanics would check for valve chamfer is:

A location where an interference angle would be found is:

Hollow pushtubes that are found to have oil inside would be an indication that:

Which instrument(s) should be used to measure wear in the valve guides?

Technician A says that a valve seat should be ground prior to changing a worn valve guide. Technician B says that valve guides should be inspected for wear, taper and out of round. Who is correct?

To adjust the valves and injectors on a Cummins engine, position the engine on:

Why might it be necessary to remove valve seat inserts in order to surface grind a cylinder head?

These pushrods should be inspected for:

When glass beading valves, the head can be glass beaded but not the stem, the reason for this is:

If a valve seat is not properly installed low enough into the head, what will NOT be a factor?

Technician A says the valve stem must be measured at the top, middle, and near the fillet. Technician B says many modern engines use tapered stems to provide additional clearance between the stem and guide close to the head of the valve. Who is right?

Reconditioning valves is being discussed. Technician A says the valve is stroked across the stone as the valve is being fed in. Technician B says when the last pass is complete, you back the valve away from the stone. Who is right?

Technician A says that a worn out valve guide will provide an inaccurate valve seat run out measurement. Technician B says that the valve seat to valve face contact area provides a path for heat from the valve head to dissipate. Who is right?

Technician A says that if a valve spring shim is used, install the serrated side toward the spring. Technician B says to determine required shim thickness, the measured distance is subtracted from the specifications. Who is right?

Technician A says that the pushrods can be checked for straightness by rolling them on a known flat surface. Technician B says that if a push-rod is bent, but cannot be seen by the eye, it will not cause a problem. Who is right?

When adjusting valve clearances, Technician A says that feeler gauge should slide with slight resistance. Technician B says that on some applications, the intake valve clearance is less than the clearance for the exhaust valve. Who is right?

What type of component failure can cause vacuum gauge fluctuations between 7 and 20 in. Hg?

How can it be determined during a cylinder leakage test if one or more of the intake valves are not sealing?

Technician A says that no matter what condition the cylinder is in, it is always more cost effective to repair the cylinder head rather than replacing it. Technician B says that properly welding cylinder head cracks can save the customer the cost of a new or re-manufactured one. Who is right?

While discussing valve spring testing, Technician A says that spring tension should be within 30 percent of the manufacturer''s specifications. Technician B says that there should be no more than 10 pounds difference between the springs. Who is right?

What is most likely to happen if a valve spring is not square?

While inspecting the engine valves, what should the valve lock grooves be inspected for?

In the figure below, what is the purpose of the function being performed?

While resurfacing the engine valves, what can indicate if the grinding stone needs to be dressed?

All of the following are true regarding valve seat resurfacing EXCEPT:

Technician A says to measure the valve seat width accurately, the minimum tool requirement would be with a machinist''s scale. Technician B says to remove material according to the position of the valve face to valve seat width measurement. Who is right?

While assembling the valve train components, Technician A says to polish the valve stems with 240 grit sandpaper. Technician B says to lubricate the valve stems with assembly lubricant, or at least with clean engine oil. Who is right?

Rocker arms are commonly made of all of the following EXCEPT:

While inspecting a rocker arm shaft, it is found to be galled and scored. Technician A says that wear in that location indicates there was a lack of lubrication. Technician B says that the shaft itself cannot be checked for straightness. Who is right?

In the figure below, what is the arrangement used to adjust the valve clearance?

The figure below shows the technician is replacing which part of the head?

The term used to describe the opening of the intake valve before the exhaust valve has fully closed is known as:

The function of coolant directors in the cylinder head is to:

When resurfacing valves and seats on a cylinder head, Technician A says that valve stems do not require resurfacing. Technician B says that there is no need for an interference angle between the valve and the seat. Who is right?

Technician A says the amount of material removed from the valve face is the size or thickness of the required valve spring shim. Technician B says shims are required to compensate for the increased valve stem tip height because of the valve and seat resurfacing. Who is right?

Valve seat inspections is being discussed on a large diesel engine. Technician A says if the valve seat is not within specification, the cylinder head must be replaced. Technician B says seat run out is a measure of how concentric the valve is in relation to the valve guide. Who is right?

All of the following are considerations when grinding valve seats EXCEPT:

How is a valve stem height corrected?

Valve overlap is the total degrees of duration:

Why are lifters offset on a camshaft?

If a valve seat is not installed low enough in the head what will result:

Success!

Heavy-Duty Mechanic - Trucks & Equipment