Exam 13: Engine Sealing and Reassembly

Identify various tasks of a cylinder head gasket.

After the head has been resurfaced on an OHC engine, a stackable multilayer aftermarket head gasket can be used to restore proper cam timing.

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?

A(n)____________________ is required for a bolt that enters a water jacket.

Technician A uses adhesives to hold gaskets in place during assembly. Technician B uses RTV when an anaerobic sealant is required. Who is correct?

Name some applications of hard gaskets.

What is meant when a bolt is stretched into yield?

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

Technician A measures valve lash on an OHC engine by rotating the engine to TDC for number 1 cylinder then measures the gap between the cam and tappet for all the valves. Technician B sets the engine at TDC for number 1 cylinder then measures the gap between the cam and tappet only on the valves that are closed. He then rotates the crankshaft 360 degrees and measures the gap between cam and tappet for the remaining valves. Who is correct?

If a bolt is stretched into ____________________, it takes a permanent set and never returns to normal.

Two technicians are discussing rear main seals. Technician A says modern engines use a molded synthetic rubber lip-type seal. Technician B says modern engines use a wick or rope type seal. Who is correct?

Before installing a used bolt on a cylinder block, Technician A threads a new nut on the bolt to check the condition of the threads. Technician B uses a thread chaser to clean the threaded holes in the block. Who is correct?

Why is it important to check TSBs before replacing a failed gasket?

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

All head bolts in an engine are the same length.

When is a torque angle gauge used?

A gasket installed upside down or reversed may cause loss of oil pressure, overheating, and engine failure.

Gasket material must be able to seal valve covers that are made from steel, aluminum, and ____________________.

What type of gasket is used on an EGR valve?

What is the major difference between aerobic and anaerobic sealants?