Onan DYG Series Operator's Manual And Parts Catalog page 19

FUEL SYSTEM
Allis-Chalmers engines used on the DYG sets are
designed for use with ASTM No. 2 Diesel fuel. They
will however, operate on diesel fuels within the
specifications delineated In the Allis-Chalmers
engine manual.
FUEL CONNECTIONS
Check local regulations governing the installation of
a fuel supply tank.-
In any diesel engine installation, fuel system cleanliness is of
utmost importance. Make every effort to prevent entrance of
moisture or contaminants of any kind. Do not use lines or fittings of
galvanized material.
A fuel lift in excess of 8 feet (2.44 m) is not
recommended without a day tank installation,
because of fuel drainage. Horizontal run, if thesupply
tank is level with the fuel pump, should not exceed 25-
feet (7.6 m). However, a day tank is again
recommended.
T A R T I N © M O T O R
S O L E N O I D \
B A T T E R Y P O S I T I V E
C O N N E C T I O N
C O N N E C T N E G A T I V E C A B L E
C O N V E N I E N T B O L T O N E N O I N E
T M E C O N N E C T I O N M U S T B E C L E A N
A N D P A I N T F R E E
2-12 V O L T , 225 A M P / H R
B A T T E R I E S
The fuel inlet is to the transfer pump and is threaded
for 3/8-inch pipe. Injectors' return line requires a 1/4-
inch low pressure hose connection.
FIGURE 1 1 . BATTERY CONNECTION
DAY TANK
Generator set installations may be equipped with an
optional separate fuel day tank. A float operated valve
controls fuel flow into the fuel tank. The correct level
is maintained to assure a constant source of fuel. It is
necessary to install an overflow line between the day
tank and the main fuel tank. Refer to the installations
included with the tank. See Figure 10 for an example
of a day tank installation.
BATTERY
Starting the unit requires 24-volt battery current. Use
two 12-volt (see Specif ications) batteries fora normal
installation. Connect the batteries in series (negative
post of first battery to positive post of second) as in
Figure 11. Necessary battery cables are on unit.
Service the batteries as necessary. Infrequent unit
use (as in emergency standby service) may allow the
batteries to self-discharge to the point where they
cannot start the unit. If installing an automatic
transfer switch that has no built-in charge circuit,
connect a separate trickle charger. Onan automatic
transfer switches include such a battery charging
circuit.
WARNING
being charged.
Do not smoke while servicing batteries. Lead
acid batteries give off explosive gases while
BATTERY, HOT LOCATION
Batteries will self discharge very quickly when in-
stalled where the ambient temperature is consistently
above 90° F (32.2° C) such as in a boiler room. To
lengthen battery life, dilute the electrolyte from its
normal 1.275 specific gravity reading at full charge to
a 1.225 reading. The cranking power is reduced
slightly when the electrolyte is so diluted, but if the
temperature is above 90° F (32.2° C), this should not
be noticed. The lengthened battery life will be worth
the effort.
1. Fully charge the battery.
2. With the battery still on charge, draw off the
electrolyte above the plates in each cell. DO NOT
ATTEMPT TO POUR OFF; use a hydrometer or
filler bulb and dispose of it in a safe manner. Avoid
skin or clothing contact with the electrolyte.
3. Refill each cell with distilled water, to normal
level.
4. Continuechargingforl hou rat a 4 to 6 hour rate.
5. Test each cell. If the specific gravity is still above
1.255, repeat steps 2, 3, and 4 until the reading is
reduced to 1.225. Usually, repeating steps twice is
sufficient.
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