PRINCIPLES OF GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 2/PE 2
PRACTICAL EXERCISE 2
1.
Instructions
On a plain piece of paper, respond to the requirements listed below.
2.
Answer these questions regarding the characteristics of diesel fuel.
a.
Diesel fuels are considered residue of the refining process. Are the
refining specification requirements as exacting as gasoline or less
exacting?
b.
Foreign material present in diesel fuel can cause damage to finely
machined injector parts. Name two ways in which this damage can occur.
c.
What is the fluid trait that determines the size of the diesel fuel
droplet, which, in turn, governs the atomization and penetration quality of
the fuel injector spray?
d.
Describe "ignition quality" as it applies to diesel fuel.
e.
When a diesel engine produces a noticeable knock during times when the
engine is under a light load, this condition is referred to as
______________ _____________, or ________________ _____________________.
f.
Multifuel engines will operate on four groups of fuel, two of which
are primary and alternate I fuels. Name the remaining two fuel groups.
g.
Before fuel enters the fuel density compensator, it must first pass
through a fuel pressure regulator that keeps the fuel at a constant pressure
regardless of engine speed or load range. What is this constant pressure
(in psi)?
3.
Second Requirement
Answer the following questions dealing with the principles, construction,
and function of diesel fuel systems.
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