Exam 13: Engine Sealing and Reassembly

What keeps the cylinder head and block aligned before the head bolts are torqued?

The shop manual should have a picture of the head bolt tightening sequence. However, if there is no shop manual or technical data available, what would the best tightening sequence be?

Technician A says some seals are designed to keep oil from escaping around a rotating shaft. Technician B says some seals are used to prevent fluid leaks between two fairly rigid flanges. Who is correct?

Technician A says cork gaskets are used on most modern engines for valve cover and oil pan gaskets. Technician B says cork gaskets will weep some of the fluid they are sealing. Who is correct?

Molded rubber gaskets should be coated with hardening-type sealer prior to installation.

After the break-in period, the cylinder head and intake manifold bolts may need to be retorqued.

After the combustion of the air/fuel mixture, the inner edges of the cylinder head gasket are exposed to approximately ____________________ psi (____________________ kPa)of pressure.

Two technicians are discussing gasket installation. Technician A says if a sealant is applied to a gasket designed to be installed dry, the gasket may leak. Technician B says if a sealant is required, it will be included in the box with the gasket. Who is correct?

The proper engine break-in procedure is a test run at ______.

Technician A says gaskets made of paper, fiber, and cork are called soft-cut gaskets. Technician B sometimes reuses old gaskets. Who is correct?

Proper engine break-in procedure is being discussed. Technician A says the engine should run at idle speed for at least two hours. Technician B says the engine should be accelerated at full throttle from 30 mph to 50 mph (80 to 133 km/h). Who is correct?

When lubrication of a fastener is recommended prior to installation, ______.

What happens when a torque-to-yield bolt is replaced with a new bolt of identical grade but torqued to the value found in a regular torque table?

Tightening of a bolt should be done with an impact wrench followed by a torque wrench.

Using a ____________________ is the best method of prelubricating most modern engines

Describe how the rocker arms are adjusted on OHV engines with hydraulic lifters.

Technician A says aluminum expands at a different rate than cast iron. Technician B says cast iron has a coefficient of thermal expansion two or three times greater than aluminum. Who is correct?

Technician A coats head gaskets with black RTV. Technician B coats exhaust manifold gaskets with red RTV. Who is correct?

What should be done to correct bolt holes in the block that are pulled up (raised)?

Technician A says damaged threads in a cylinder head can be repaired with a helically coiled insert. Technician B says stripped threads are commonly caused by overtorquing. Who is correct?