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:
Please select 2 correct answers
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:
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?
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:
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?
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:
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