FILTERS BALDWIN

Catalog Baldwinfilters for tractors

Auto Parts / or cracked EGR coolers that can Shick also stresses that technicians
emerge. need to trust the diagnostic codes when
deciding which injectors to replace.
“Those problems arise from
‘torsional vibrations,’ or high- “It’s amazing how many electronic
frequency pulsing that originates components are returned fault-free,”
with the fuel-injection systems,” he he says, noting how technicians who
says, noting how Volvo has find a fault code with one injector
addressed the issue with camshaft- often decide that the rest should be
mounted vibration dampers that replaced at the same time. “Don’t try
have been used since the D12C was to rationalize around the system.
introduced in 1998. Don’t jump to the conclusions it’s a
wear issue… with all good
“Another way torsionals can be
intentions, they (technicians) think
reduced is to drive the camshaft they’re saving customer callbacks
from the rear. This focuses any
and saving themselves headaches.
remaining torsional vibrations into In the end, that causes a lot of
the flywheel, which is the rotating
excess expenses.”
part of the engine with the greatest
mass,” Saxman adds. “When using the scan tool to
diagnose the vehicle, you still have to
apply what you learned from your
VALVE REPLACEMENTS scan tool to your troubleshooting
MADE EASY process,” Gollub adds. It means that
technicians must remember to search
for the root cause of a problem when
But what about the valves themselves?
injectors are being replaced. “Start
Where are they likely to fail?
fishing back into the system,” he says,
Hutto suggests the failures normally referring to the filters, filler neck, fuel
will occur in the controlling area of tank and water separator.
the valve, such as the poppet valve
It is a good habit to adopt,
on a Detroit Diesel Series 60 engine. considering that the filtration will
Common rail systems, meanwhile,
become more important than ever in
will tend to wear out at the nozzle the years to come.
and check valves.
Hutto, for example, suggest that the
Luckily for service technicians, one of industry is nowhere near the limit of
the advantages of a common rail
the pressures that will be introduced.
system comes in the form of easy
injector replacements. These designs “I’ve hear talk of 150,000 (psi),” he
mean that there is no need to set unit says. Engineers are obviously under
injectors when running the overheads, some extra pressure to create the
and the need to repair highly stressed components that will support the
injector rockers also disappears. additional forces.
Reprinted with permission from
Still, there are some important
replacement procedures to follow Truck Parts & Services.
with any style of injector. A number
of the components cannot be re-
used, even if they do seem “good
enough” to fit. Seals, for example,
sacrifice themselves when they are
first installed.

1265 / Auto Parts

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