Heads, Valves, and Components

Injector sleeves/tubes are usually made from:

cast iron

copper

aluminum

babbit

Correct! Wrong!

Valve crossheads (valve bridges) are used to:

open four valves using one rocker arm

open two valves using one rocker arm

prevent valve stem 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!

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

cracks.

spring tension

pitting and nicks.

spring coil gap.

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 it''s 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 degree 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, them 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!

Valve guides are classified as:

welded or threaded in place

cast iron or aluminum

internally or externally threaded

integral or replaceable

Correct! Wrong!

The margin of a valve refers to the:

distance from the valve face to the 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 replace

the engine is running excessive oil pressure

oil drain back passages may be restricted

this is a normal condition and the push tube may be reused

Correct! Wrong!

Which instruments(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!

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!

When glass beading valves, the head should 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 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 that the push-rods can be checked for straightness by rolling them on a known flat surface. Technician B says that if a push-rod is bent, but it 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!

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 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

Show hint

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

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 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!

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 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 inspection 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 seat is in relation to the valve guide. Who is right?

A only

B only

Both A and B

Neither A nor B

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!

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!

These pushtubes should be inspected for:

straightness, damage, 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!

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!

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!

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 seal?

valve seat lower edge width

valve seat upper edge width

the valve seat width

valve seat degree angle

Correct! Wrong!

A valve with excessive runout should be:

straightened

replaced

reused

reground

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!

Insufficient valve head height (below specifications) causes:

reduction in compression ratio

an increase in compression ratio

insufficient valve face contact

piston to valve contact

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

straightened

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!

Crossheads 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 precisely the same time

Correct! Wrong!

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

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

route the coolant and oil to the turbocharger

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 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 contacts 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!

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!

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 its a good idea

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!

Injector sleeves/tubes are usually made from:

Valve crossheads (valve bridges) are used to:

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

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

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:

Valve guides are classified as:

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

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

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

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

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

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?

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

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:

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 valve and seat resurfacing. Who is right?

Valve seat inspection 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 seat is in relation to the valve guide. Who is right?

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?

These pushtubes should be inspected for:

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?

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

Cylinder head fasteners should be loosened from the:

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

A valve with excessive runout should be:

Valve seat inserts can be removed by:

Insufficient valve head height (below specifications) causes:

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

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

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

Crossheads must be carefully adjusted to ensure that:

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 is used to:

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

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

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

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?

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Heavy-Duty Mechanic - Trucks & Equipment