Deck 14: Servicing and Maintenance

Question 1

Why should starting fluids such as ether be avoided in light duty diesel engines?

A) Danger of blowing out piston rings.
B) Danger of damaging injectors.
C) Starting fluids will corrode fuel system components.
D) It does not meet emission standards.

Answer 1

A

Question 2

Which of the following procedures should be completed after an air filter has been saturated with water?

A) A complete check of the entire breathing circuit.
B) Check the filter material for cracking and replace if required.
C) Nothing because air filters are designed to operate in wet condition.
D) Reset the restriction gauge.

Answer 2

D

Question 3

Under what conditions do manufacturers recommend using block heaters in mobile light duty diesels?

A) Below -10 degF (-23degC).
B) Block heaters are aftermarket devices not recommended by manufacturers.
C) Prior to starting an engine that has sat in a cold climate for extended periods.
D) Anytime outside air temperatures fall below freezing.

Answer 3

A

Question 4

What has replaced service manuals and generic scan tools for most vehicle maintenance?

A) Proprietary scan tools with onboard manuals.
B) Specialized software on a laptop.
C) Telematics links to OEM SIS resources.
D) Chassis installed diagnostic computers.

Question 5

What type of coolant is often recommended when engines are operated in sub-arctic winter temperatures?

A) Ethylen glycol (EG).
B) Carboxylate extended life coolant (ELC).
C) Propylene glycol (PG).
D) Waterless coolant. (WC).

Question 6

What should technicians avoid using in cooling systems?

A) Waterless coolant (WC).
B) Tap water.
C) Propylene glycol.
D) Distilled water.

Question 7

Since 1997 which of the following is not required when starting a highway compliant diesel engine?

A) A warm up period.
B) Boosting.
C) Fully depressing the accelerator.
D) Glow plugs.

Question 8

What is the recommended water to coolant mixing ratio for ethylene glycol based coolants?

A) 20:1
B) 50:1
C) 10:1
D) 1:1

Question 9

Most current light duty diesel engines are equipped with how many fuel filters?

A) 1
B) 4
C) None, fuel filters are no longer used in current fuel systems.
D) 2

Question 10

Under what condition should the engine coolant level be checked?

A) Revving.
B) Idling.
C) Hot.
D) Cold.

Question 11

Most recently manufactured diesel engines feature what type of fuel subsystem priming?

A) Mechanical priming.
B) Self-purging.
C) Quick-priming.
D) Self-priming.

Question 12

What happens if the DEF runs low during vehicle operation?

A) The engine is immediately shut down.
B) The vehicle enters progressive trim back modes.
C) Nothing.
D) A code is logged in the PCM to notify technicians the next time vehicle is serviced.

Question 13

What is the only type of diesel fuel now available at the pumps for on-highway use?

A) Synthetic.
B) Refinery aged.
C) Ultra low sulfur.
D) Reduced sulfur.

Question 14

What is a typical break-in period for most light-duty diesels?

A) The first 10,000 odometer miles.
B) The first 500 to 1,000 highway miles.
C) Manufacturers perform break in at the factory.
D) The first hour of operating time.

Question 15

Manufacturers suggest a diesel-powered vehicle should be driven at least 500 miles (800km) before doing what?

A) Towing a trailer.
B) High rpm operation.
C) Engine shutdown without extended cooling off periods.
D) Carrying passengers.

Question 16

What type of container should never be used for diesel fuel?

A) Plastic.
B) Zinc galvanized.
C) Steel alloys.
D) Metal.

Question 17

How often should engine oil be checked during the break-in period?

A) After the break-in period is complete.
B) After every engine shutdown.
C) After extended operating periods at highway speeds.
D) At every refueling.

Question 18

During cold start of diesel engines what is usually disabled during cranking?

A) All exhaust aftertreatment devices.
B) Gear shift input.
C) Ether injection circuit.
D) Accelerator pedal input.

Question 19

What are the advantages of using a waterless engine coolant?

A) Never has to be changed or tested.
B) Better lubricity.
C) It can be topped up with water.
D) Better cooling properties.

Question 20

Why does engine coolant tend to breakdown faster in current diesel engines?

A) Higher operating temperatures.
B) Extensive use of aluminum in the cooling circuit components.
C) Current diesels also use coolant for component lubrication which accelerates breakdown.
D) Because of silicone based hoses.

Question 21

A driver accidentally adds a small amount of gasoline to a half full diesel pickup fuel tank. Technician A recommends waiting 15 minutes before starting, then to drive to the nearest shop for service. Technician B recommends that fuel be stirred to properly mix the two fuels. Who is correct?

A) Technician A only.
B) Technician B only.
C) Both A and B.
D) Neither A nor B.