Onan MDJF Series Operator's Manual And Parts Catalog page 21

light loads. Apply full load occasionally before shut-down to
prevent excessive carbon accumulations.
Try to connect the load in steps instead of full load at
one time. Most installations use a line switch that must
be
closed to connect a portion of the load.
EXERCISE STANDBY SETS
Infrequent set use results in hard setting. Operate standby
set a least 30 minutes each week. Run longer if battery
needs charging.
BREAK·IN PROCEDURE
The unit should
be
run in the following sequence:
1. One half hour at 1/2 load.
2. One half hour at 3/4 load.
3. Full load.
Continuous running under one half load during the first
few hundred hours usually. results in poor piston ring
. seating, causing higher than normal oil consumption and
blowby.
MOTE: Drain the initial oil after SOhours
of operation
while the engine is still hot.
SAFElY DEVICES
In case of dangerously high coolant (water) temperature or
low oil pressure, the cut-off switch stops the unit. After an
emergency stop, investigate and correct the cause. Press
re-set button before restarting.
EMERGENCY OPERATION IF BATTERY FAILS
MD JF generating sets require a battery for running. If the
set battery fails completely and set must be operated during
an emergency, a battery can be shared with ether equipment
provided the set charging circuit is disconnected as follows:
Remove the ammeter wire connected to terminal No.8 in the
cootro! box and tape the bare end. The set will not charge
the battery with this lead wire disconnected.
HEAT EXCHANGER (OPTIONAL) FILLING
Improper filling of the heat exchanger can cause overheating·
of the e!lgine. Therefore, to prevent this possibility, follow
these instructions whenever adding Icooling to the heat
exchanger:
1.
Remove fill cap.
2. Open fill vent valve (turn counterclockwise).
3. Remove vent plug, (Spec A through C).
4. Fill with coolant.
5. Close fil.} vent valve (turn clockwise).
6. Replace vent plug. (Spec A through C).
7. Replace fill cap.
8. Operate unit 10 minutes at full load, watch for leaks.
9. Shutdown unit.
After running unit 10 minates, the
closed cooling system is pressurized
and hot.
Open
the 14 lb. preSSfJre cap slowly to vent
pressure.
10. Slowly open pressure cap and check water level.
11. Fill system to top with coolant.
OUT-Of·SERVICE PROTECTION
When taking unit out of service for 30-days or longer, proper
storage methods must be used to prevent damage from cor­
rosion, contamination, and temperature extremes.
Fuel System
1. Clean air cleaner (if used) - do not service air cleaner
with oiL Check and clean air intake.
2. Cover or seal exposed air intake openings.
3. Clean throttle linkage (and governor linkage) thoroughly.
Lubricate metal ball joints with light machine oil (do
not lubricate plastic ball joints) .
Oil System
1. Drain engine lubricating oil while engine is warm. Serv ­
ice the engine with proper oil. TAG the engine to
IDENTIFY the lubricating oil installed. Secure the oil
filter cap.
2. Remove fuel injectors. Pour 2 ounces of rust inhibitor
oil (SAESO substitute) into each cylinder. Crank e!lgine
over by hand several revolutions
to
lubricate cylinder
walls, pistons, and rings. Install injectors.
3. Remove and service oil filter.
Cooling System
1. Drain entire cooling system including water cooled ex ­
haust manifold and exhaust line. Drain heat exchanger
or keel cooler components, engine cylinder block, and
water pumps.
Senerating units equipped with heat exchanger or keel
cooling may be filled with a good quality anti-freeze if
freezing temperatures are expected. Drain only those
components not protected from freezing (exhaust lines,
water intake and outlet lines, etc.).
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