AUT-102 Cyl Head

In a(n) ________ engine, there is a camshaft for the intake valves and a separate camshaft for the exhaust valves.

• DOHC

• Single OHC

• OHV

• L Head

Answer explanation

CDX CH 19 Slide 15

The wedge combustion chamber:

• has a small combustion chamber surface area.

• lowers hydrocarbon emissions.

• has the spark plug placed at the thick end of the wedge.

• All of the above

Answer explanation

CDX CH 19 slide 20

_________ keep oil from leaking past a rotating camshaft.

• Plugs

• Camshaft seals

• Rocker arms

• Valve retainers

Answer explanation

CDX C 19 slide 67

Rocker arms, which pivot on one end, or cam followers, which pivot near the center, ride on each cam lobe and directly operate each valve.

• True

• False

Answer explanation

CDX Ch 19 slide 53

The cylinder head relates to the entire engine assembly by providing the “end cap” for the combustion chamber.

• True

• False

Answer explanation

CDX CH 19 slide 10

A machinist can repair the integral valve guide by using a head shop to machine the valve guide (boring out) then installing a thick wall guide, which can be made of _______, and then machining it to the proper size.

• Bronze or iron

• Iron alloy

• Aluminum alloy

• Both A and B

Valve seat grinding is the term used to describe when the seat is ground to the proper angle with a special grinding stone.

• True

• False

Answer explanation

CDX CH 19 Slide 36

Open intake valves in the cylinder head are closed by pressure from the:

• piston

• exhaust

• intake manifold

• valve springs

Answer explanation

CDX CH 19 slide 28

In an extreme case, _________ could cause the head to separate from the stem and drop into the combustion chamber, causing catastrophic engine damage.

• Tensile failure of a valve

• Valve cooling

• Both A and B

• Neither A nor B

Answer explanation

Extra credit if you can find the slide

Usually in engines that operate at high rpm, the manufacturer uses multiple springs to close the valve; This prevents valve float, which occurs when the valves do not fully close due to excessive engine RPM

• True

• False