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jd fuels > Fuel System and Nozzles > Flashcards

Fuel System and Nozzles Flashcards

1
Q

What can add or subtract 100 PSI inside the Heavy-Duty Nozzle

A

Addition or Subtraction of the Shim by .002

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2
Q

Return Fuel- Opening Pressure Adjustment- Valve Lift Adjustment- Opening Pressure Spring- Locating Clamp- Fuel Inlet- Edge Filter- Nozzle Body- Nozzle Valve- Teflon Sealing Ring- Spray Tip.

A

Pencil Nozzle

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3
Q

Injection nozzles perform three functions:

A

1.Disperse fuel spray to mix fuel with air 2. Atomize fuel for efficient combustion 3. Complete nozzle shutoff to prevent fuel leakage

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4
Q

What type of brush do you use to clean nozzles?

A

Brass wire brush

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5
Q

Nozzle Test:

A
  1. Spray Pattern and Chatter 2. Opening Pressure 3. Valve leakage
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6
Q

Prime job of the diesel fuel system?

A

To inject a precise amount of atomized and pressurized fuel into each cylinder at the proper time

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7
Q

Major parts of the fuel system:

A
  1. Fuel Tank 2. Fuel Transfer Pump 3. Fuel Filters 4. Injection Pump 5. Injection Nozzles
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8
Q

The injection system must?

A
  1. Supply the correct quantity fuel 2. Time the delivery of the fuel 3. Control the fuel delivery rate
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9
Q

The fuel injection system must? (Continued)

A
  1. Break up or atomize the fuel 5. Distribute fuel evenly through the cylinder
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10
Q

Elements of fuel tanks?

A

Capacity 2. Size 3. Shape 4. Venting 5. Openings

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11
Q

Typical problems of the fuel tanks?

A

Leaks, condensation, dirt

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12
Q

Methods to locate a leak on tanks?

A

Wet method

Air pressure method

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13
Q

Two types of electric fuel gauges?

A

Balancing coil gauge

Thermostatic gauge

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14
Q

Types of diesel fuel lines?

A

Heavy-Weight
Medium-Weight
Light-Weight

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15
Q

Fuel filtration is critical because?

A
  1. Diesel fuel lines tends to contain particles and moisture 2. Injection parts are precision-fitted
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16
Q

Stages of a filtration system?

A

Filter Screen
Primary Filter
Secondary Filter

17
Q

Three ways fuel filtration can be done?

A

Straining
Absorption
Separation

18
Q

Dual filters function in?

A

Series

Parallel

19
Q

Types of injection systems?

A
  1. Early common rail 2. Accumulator 3. Injection Pump 4. Electronic Unit Injector 5. Electronic Injector/ High Pressure Common Rail
20
Q

Types of injection pumps?

A

In-line

Distribution

21
Q

Most common fuel injection pumps

A

Individual pump and nozzle for each cylinder

Pumps in common housing, nozzles for each cylinder (in-line

22
Q

Most common fuel injection pumps (continued)

A

Single pump serving injection nozzles for several cylinders (distributor)

23
Q

Important qualities of gasoline?

A
  1. Proper Octane rating 2. Easy Starting 3. High oxidation stability and freedom from gum
24
Q

Important gas qualities (continued)

A
  1. Freedom from foreign matter, (water and dirt) 5. Use of fuel additives 6. Volatility
25
Q

Why are additives used?

A

To raise octane number and to combat gum formation and surface ignition

26
Q

Factors affecting knock

A

Antiknock quality of gas

Octane number requirement of the engine

27
Q

What is bad for your engine?

A

Alcohol

28
Q

What do you add to your engine?

A

Dyes
Antioxidants
Carburetor detergents
Antiknock additives

29
Q

Diesel major grades

A

1
2
4

30
Q

Sulfur

A

15 parts per million is Ultra low sulfur fuel

31
Q

What is pour point?

A

Lowest temperature which fuel ceases to flow

32
Q

What is cloud point/ gel point?

A

Temperature in which diesel becomes cloudy and forms wax crystals

33
Q

When does the injection pump perform most efficiently?

A

When the fuel has the proper “body” or viscosity

34
Q

What is flash point?

A

Temperature to which fuel must be heated to create a mixture of fuel vapor and air

35
Q

What is Carbon residue?

A

The amount of material left after evaporation of the fuel

36
Q

What is ash?

A

Small amounts of non burnable material

37
Q

What factors should you consider in storing of fuels?

A

Protection and fuel quality
Safety
Convenience
Cost

38
Q

What conditions you must control for a satisfactory quality of your gasoline?

A

Control loss through evaporation
Avoid gum deposits
Protect from water and dirt

39
Q

Types of close nozzles

A

Inward

Outward

jd fuels (1 decks)

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