Exam 12: Upper-End Theory and Service

Technician A says multivalve engines can have two valves per cylinder. Technician B says multivalve engines must have five valves per cylinder. Who is correct?

Technician A says if valve stem height exceeds specifications, it can be adjusted by grinding the valve tip. Technician B says the valve stem height can be adjusted with shims. Who is correct?

Technician A says multivalve engines have a more complete combustion than conventional engine designs. Technician B says the benefits of multivalve engines may be offset by a more complicated camshaft arrangement. Who is correct ?

Resurfacing a cylinder head gasket surface may alter the combustion chamber volume.

What is the most common cause of warpage in an aluminum cylinder head?

After resurfacing a valve seat at 45 degrees, the seat is too wide and the contact pattern extends all the way up to the valve margin. What should be done to bring the seat width into specifications?

____________________ is a very rapid movement of gases that causes the air and fuel to mix better and improve combustion.

Which of the following statements about knurling is false?

Many camshaft journals run directly on aluminum supports and do not use bearing inserts.

Cylinder head warpage can be measured with _____.

Powder metal valve seats are softer and do not last as long as cast iron seats.

Where on the cylinder head are cracks most likely to occur?

Multiple valve engines tend to be more efficient than engines with two valves per cylinder because:

To ensure proper seating of the valve, the valve seat must _____.

What is typically the maximum amount of warpage that is acceptable on a cast-iron cylinder head?

Technician A checks for bent pushrods by rolling them on a flat surface. Technician B checks for bent pushrods using a dial indicator and V-blocks. Who is correct?