FUEL TRANSFER PUMP
PRIMING LEVER
After running 10 minutes under load the water
temperature gauge should have stabilized at 180° to
195° F. On city watercooled units an adjustable valve
is connected in the water supply line. Adjust the hand
wheel valve to provide a water flow that will keep the
water temperatu re gauge reading within the range of
180
o
F to 220° F.
FUEL INLET
FIGURE 18. PRIMING FUEL SYSTEM
»II the primer lever will not pump and no resistance is lelt at upper
end of stroke, turn engine over with starter to change position of
fuel pump drive lobe on camshaft.
Check all connections in fuel system for security, to
ensure that pressure will not bleed off when engine is
not in use. Pressure should be maintained for im-
mediate starting if unit is on standby service.
BATTERIES
Ensure that the cable connections to the batteries are
secure. Coat connections with petroleum based or
non-conductive grease to retard formation of cor-
rosive deposits.
Check level of electrolyte to be at split ring mark.
Measure specific gravity of electrolyte: SG 1.280 at
80° F. If distilled water has been added or specific
gravity is less than
1.280,
place batteries on charge
until desired reading is reached. Do not over charge.
STARTING
When the preceding service functions have been
performed,
recheck to verify unit is ready to start.
1.
Crankcase filled.
2.
Cooling system filled — input solenoid valve
open.
3. Batteries charged and connected.
4.
Fuel solenoid valve open.
To start, move the "run-stop/reset-remote" switch to
the "run" position. The engine should start afterafew
seconds of cranking. Immediately after start, observe
the oil pressure gauge. Normal oil pressure is
between 45 and 65 psi. Check the following gauges:
1.
DC Ammeter — 10 to 30 amperes.
2.
AC Voltmeter — AC generator output voltage.
3. Frequency Meter — AC generator output fre-
quency.
STOPPING "
To reduce and stabilize engine temperatures, run the
engine at no.:load for three to five minutes before
shutting down..
Move the run-stop/reset-remote switch to stop
posi-
tion to shut down the set.
Break-In Note: Run set at 50 percent rated load forthe
first half-hour of initial operation after reaching
operating temperature.
Non-Start: If after a few seconds of cranking engine
fails to start, or starts and runs then stops and fault
lamp lights, refer to appropriate troubleshooting
chart, Table 3 or Table 4.
EXERCISE
PERIOD
Generating sets on continuous standby service are
required to be operative at full load from
a
cold start in
less than 10-seconds in the event of a power outage.
This imposes severe conditions on the engine. Fric-
tion of dry piston rings upon dry cylinderwalls causes
scuffing and rapid wearing. These can be relieved by
exercising the set at least once a week for a minimum
time of 30-minutes per exercise period. Preferably,
run the set under at least 50 percent load to allow the
engine to reach normal operating temperature. This
will keep engine parts lubricated, maintain fuel prime,
prevent electrical relay contacts from oxidizing and
insure easy emergency starts. ONAN automatic
transfer switches contain an optional exercise switch
which,
by pre-selection, will start, determine run
period and shut down a set on a weekly frequency.
For example, the switch can be set for time of start,
length of run, A.M. or P.M. and day of week.
After each exercise period, top up fuel tank, check
engine for leaks and unit for general condition.
Locate cause of leaks (if any) and correct.
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