Specifications

engine operates for a long period of time below 40% it begins to over fuel. This happens
because the injection tips begins to carbonize and disrupt the fuel spray pattern. The
only way to correct a diesel engine if it has begun to wet stack is to load the engine for a
couple of hours to burn off the excess fuel and clean up the engine. Diesel generator
sets with electronically controlled engines or advance emission systems are less likely
to wet stack. But all diesel engines will wet stack unfortunately, if operated for long
periods of time below rated levels. This is the reason it is important to get the proper
size and design of a diesel generator set.
Cold Weather Usage
Diesel fuel thickens in cold weather. It has a tendency to gel as it contains some
naturally occurring paraffin (wax) and as the temperature drops, this paraffin crystallizes
and affects the fluidity of the fuel and may cause hard starting and eventually lead to
filter plugging. You can use a fuel additive to prevent this.
Regular diesel fuel is winterized or seasonally adjusted at the distributor before it is
delivered to the pumps.
In cold weather fuel does not vaporize very well in the combustion chamber this makes
staring difficult. Modern diesel engines designed for cold weather use a pre heater and
glow plugs. Glow plugs are heating elements that work on a timed circuit or are
manually activated just before the engine is started. The colder it gets, the longer those
glow plugs need to stay on to preheat the combustion chamber for a smooth start.
Batteries that are weak may not crank the starter motor fast enough or long enough to
start a cold engine. As the temperature goes down, so does battery capacity. A battery
that has all of its power available at 80 degrees F will have only about 46% available
power at 0 degrees F. Plus, the engine will be 2.5 times harder to start at 0 degrees due
to thicker oil and resistance to movement of internal moving parts. In effect, an engine is
about five times harder to start at 0 degrees F than at 80 degrees F. Test weak or
suspicious batteries under load before cold weather to help eliminate potential problems
during busy times. If batteries need replacement, always replace with a battery equal to
the original battery.
Two different types of preheat elements seen after air filter has been removed. Before
starting heater gets red hot warming up air.. Seconds later when the starter kicks in the
generator pulls in this heated hear causing the diesel fuel to vaporize and ignite easier.
If you can press and hold the decompression lever a second while cranking and let go,
it will also help in the cold starting process. Use glow plugs or block heaters on the
engine for cold weather starts. Glow plugs heat the internal combustion chamber area
or preheat the air intake to suitable temperatures for combustion. Otherwise, cold fuel
sprayed into the chamber and onto the glow plugs can gel and adhere to these parts.
Hard starting and inefficient combustion occur with potential for damage to plugs and
cylinder heads. Use Number 1 diesel fuel in cold weather. It is more volatile than
AGI6500DE & AGI6500SDE Operator / Owners Manual Version 11.4
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