Question 1

Technician A says that valve stem-to-guide clearance can be measured using a dial indicator. Technician B says that valve stem-to-guide clearance can be measured using a feeler gauge. Who is right?

Accepted Answer

Valve stem-to-guide clearance can be measured using a dial indicator by measuring the movement of the valve stem within the guide.

Question 2

Technician A says that if a camshaft does not turn easily, the head probably requires straightening. Technician B says that if the cam side of an OHC head is warped excessively, the head can be straightened. Who is right?

Accepted Answer

Both technicians are correct. If a camshaft does not turn easily, the head probably requires straightening. If the cam side of an OHC head is warped excessively, the head can be straightened.

Question 3

Technician A says that Magnaflux is a crack detection method that is commonly used on aluminum heads. Technician B says that bead blasting is the preferred method for cleaning OHC heads. Who is right?

Accepted Answer

Magnaflux is a magnetic particle inspection method used for detecting cracks and defects in ferrous metals, not suitable for non-magnetic materials like aluminum. Bead blasting, while used for cleaning, is not the preferred method for OHC heads due to the risk of beads getting lodged in oil passages or other critical areas, potentially causing damage.

Question 4

A cylinder head has required substantial metal removal to make it flat. Technician A says that a shim can be installed under the head gasket to compensate. Technician B says that on OHC engines, the valve timing will be retarded. Who is right?

Accepted Answer

Both technicians are correct. Technician A is right in saying that a shim can be installed under the head gasket to compensate for the material removed from the cylinder head, which helps maintain the proper compression ratio and sealing. Technician B is correct in stating that on overhead cam (OHC) engines, removing material from the cylinder head or using a shim can affect the geometry of the timing belt or chain setup, potentially retarding the valve timing.

Question 5

An engine has a warped cylinder head. Technician A says that this could be caused by running the engine with a faulty thermostat. Technician B says that this could be because the engine was overheated. Who is right?

Accepted Answer

Both technicians are correct. Running an engine with a faulty thermostat can cause it to overheat, which can result in a warped cylinder head. Overheating can also be caused by other factors, such as a lack of coolant or a malfunctioning cooling system.

Quiz 7: Cylinder Head: Parts and Service

Technician A says that valve stem-to-guide clearance can be measured using a dial indicator. Technician B says that valve stem-to-guide clearance can be measured using a feeler gauge. Who is right?

Technician A says that if a camshaft does not turn easily, the head probably requires straightening. Technician B says that if the cam side of an OHC head is warped excessively, the head can be straightened. Who is right?

Technician A says that Magnaflux is a crack detection method that is commonly used on aluminum heads. Technician B says that bead blasting is the preferred method for cleaning OHC heads. Who is right?

A cylinder head has required substantial metal removal to make it flat. Technician A says that a shim can be installed under the head gasket to compensate. Technician B says that on OHC engines, the valve timing will be retarded. Who is right?

An engine has a warped cylinder head. Technician A says that this could be caused by running the engine with a faulty thermostat. Technician B says that this could be because the engine was overheated. Who is right?