Exam 13: Engine Sealing and Reassembly

Torque-to-yield bolts are being discussed. Technician A says compared to conventional bolts, torque-to-yield bolts offer a more consistent clamping force. Technician B says torque-to-yield bolts are tightened to a specific torque, and then rotated a certain number of degrees. Who is correct?

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

What are the most common causes of head gasket failure?

What is meant when a bolt is stretched into yield?

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

A bolt is considered to be ____________________ because it can be stretched and compressed up to a certain point.

Anaerobic sealant can be used for _____ as well as gasketing.

Hard gaskets are made of ______.

On some OHC engines, the camshaft[s] must be removed to adjust the valve lash.

Technician A says excessive RTV on an engine gasket can cause blockage in the oil passages and cause severe engine damage. Technician B says RTV is impervious to most fluids. Who is correct?

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

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

To provide a good sealing joint between the cylinder head and exhaust manifold, apply a sealant to the machined surfaces.

What type of gasket is used on an EGR valve?

Name some applications of hard gaskets.

What is a bimetal engine?

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?

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

Prior to adding oil, a freshly rebuilt engine should be cranked for thirty seconds to enable the crankshaft and rod bearings to wear in.

A torque-to-yield bolt can be reused if it is not damaged.