Chapter 26

Which of these smoke colors indicates excessive fuel being burned in the combustion chamber?

• White

• Grey

• Blue

• Black

Two technicians are discussing oil leaks. Technician A says that an oil leak can be found using a fluorescent dye in the oil with a black light to check for leaks. Technician B says that a white spray powder can be used to locate oil leaks. Who is right?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

Which of the following is the LEAST LIKELY to cause an engine noise?

• Loose accessory drive belt

• Vacuum leak

• Carbon on the pistons

• Cracked exhaust manifold

Engine oil pressure at 3500 RPM should be at least ____ PSI.

• 25

• 35

• 10

• 42

A good engine should produce how much compression during a running (dynamic) compression test at idle?

• 100 to 150 PSI

• 30 to 60 PSI

• 60 to 90 PSI

• 150 to 200 PSI

What is considered a good reading for a cylinder leakage test?

• All cylinders above 70% leakage and within 7% of each other

• All cylinders below 20% leakage

• All cylinders above 20% leakage

• Within 20% leakage between cylinders

Technician A says that during a power balance test, the cylinder that causes the biggest RPM drop is the weak cylinder. Technician B says that if one spark plug wire is grounded out and the engine speed does not drop, a weak or dead cylinder is indicated. Who is right?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

What should the cranking vacuum be?

• 6 to 16 in. Hg

• Over 25 in. Hg

• 2.5 in. Hg or higher

• 17 to 21 in. Hg

Technician A says that a leaking head gasket can be tested for by using a chemical tester. Technician B says that a leaking head gasket can be found using an exhaust gas analyzer. Who is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

When does the low oil pressure warning light usually come on?

• Whenever an oil change is required

• Whenever oil pressure drops dangerously low (4 to 7 psi)

• Whenever the oil filter anti-drain back valve opens

• Whenever the oil filter bypass valve opens