ENGINE AND ENGINE SYSTEMS 5540F/YB5515 SERVICE MANUAL
6-4 Published 10-21-2010, Control# 198-04
Fuel Injectors
Fuel injectors should be taken out and examined at regular
intervals. Refer to the engine operator’s manual.
QSB Engine Electronic Controlled Fuel
System Units
Refer to the Engine Manual Furnished with this unit for a
description of the Electronic Controlled Fuel System.
Types of Fuel to Use
Fuel represents the major portion of the crane’s operating
costs. Therefore, it is important to use it efficiently. Don’t let
cost tempt you to use an inferior diesel fuel. The savings is a
false economy when you consider the damage poor fuel can
do to your crane’s engine.
NOTE: Use only diesel fuel designed for diesel engines.
Some heating fuels contain harmful chemicals
which can seriously affect engine efficiency and
performance.
NOTE: Due to precise tolerances of diesel fuel injection
systems, it is extremely important that the fuel be
kept clean and free of dirt and water. Dirt or water in
the system can cause severe damage to both the
injection pump and the injection nozzles.
Use either a Grade No. 1 or a Grade No. 2 diesel fuel as
defined by ASTM Designation D-975 for diesel engines. In
European countries, use ISO 1585 commercial diesel fuel.
Find expected air temperature at time of start up on the
thermostatic scale Figure 6-3. Correct diesel fuel grade (A,
B) is shown next to the scale.
NOTE: If engine is operating at temperatures 0 -40° to -70°
F (-40° to -57° C), Grade DF-A arctic fuel is
recommended. Also consult the engine distributor
for special lubricants and starting aids.
Cetane number should be a minimum of 40 to assure
satisfactory starting and overall performance. At low
temperatures and/or high altitudes, minimum cetane number
of 45 is recommended.
NOTE: Excessive white smoke at start up could be a result
of low cetane fuel.
Use low sulfur content fuel with a cloud point of at least 10° F
(6° C) below the lowest expected air temperature at time of
starting. The cloud point is temperature at which wax crystals
begin to form in diesel fuel.
NOTE: When using diesel fuel with a sulfur content above
0.5%, the engine oil change interval must be
reduced by 50%. DO NOT use a fuel with more
than 1% sulfur.
Cetane number should be a minimum of 40 to assure
satisfactory starting and overall performance. At low
temperatures and/or high altitudes, minimum cetane number
of 45 is recommended.
WARNING
Do not mix gasoline or alcohol with diesel fuel. This
mixture can cause and explosion.
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