Onan MDJF Series User Manual

OPERATION
CRANKCASE OIL
Use an oil with the API designation CD/SE, or CD/SD
(formerly DS) that has passed the Series 3 Test and at
least Sequences IIA and HIA of the Automotive Manu-
facturer's MS Sequence Tests. (DM oil which has passed
the Automotive Manufacturer's MS Sequence Tests and the
MIL-L-2104B Tests may also be used when ambient tempera-
tures are lower than 30°F.) To reduce oil consumption
to a normal level in the shortest time on a new or rebuilt
"J" series diesel engine, use CC (formerly DM) oil (pass-
ing the MS Sequence Tests) for the first fill only (50 to 100
hours), then change to the recommended oil.
TEMPERATURE
Above 32
0
F
0
o
F to 32
0
F
Below 0
o
F
GRADE
SAE 30
SAE .10W-30, 5W-20, or
10W, 5W-30
SAE 5W-20 or 5W-30
Do not mix brands or grades. Refer to Maintenance Section
for recommended oil changes.
RECOMMENDED FUEL
Depends on operating concfitions. Use NO. 2 diesel fuel for
best economy. Use NO. 1 diesel fuel (a) when ambient tem-
perature is below 32
0
F., or (b) at all temperatures during
long periods of light engine load, (c) if preferred by user.
Use low sulfur content fuel having a pour point (ability to
filter) of at least 10
OF
- below the lowest expected tempera-
ture. . Keep fuel clean and protected from adverse weather.
Leave some room for expansion when filling the tank.
INITIAL START
Check the engine to make sure it has been filled with oil
and that fuel system is air- free.
Bleed air from fuel system as follows: Disconnect the fuel
WORK TRANSFER PUMP
PRIMING LEVER UNTIL
FUEL FLOWS FROM RE-
TURN LINE FITTING OF
INJECTION PUMP.
return line. See Fig. 14. Operate the hand priming lever on
diaphragm type fuel, transfer pump until there are no air bub-
bles in fuel flowing from the fuel return line fitting. Then
connect the fuel return line. NOTE: If the camshaft pump
lobe is up, crank engine one revolution to permit hand prim-
ing. When finished, return priming lever inward (disengaged
position) to permit normal pump operation.
Temporarily removethe plug from the water pump inlet fitting.
Figure 10. Fill the pump with water to lubricate and prime
it. Replace plug before operation.
STARTING
(1) For cold engine starting above 55
0
F, depress the mani-
fold heater switch for one minute. (2) Push START-STOP
switch to its START position. (3) Release switch after en-
gine starts and reaches speed. (4) Oil pressure should read
at least 20 psi (pressure-relief valve is not adjustable).
The most common failure to start is caused by unit running
out of fuel—and then not properly bleeding the fuel system
before attempting to start.
If the set control has a re-set button, push it to re-set
after a shutdown resulting from lowoil pressure or high water
temperature occurs. Find the cause before re-starting the
engine. If continuous false starting occurs, make sure the
centrifugal switch (Fig. 16) closes during speed build-up.
The adjustable resistor slide tap (in the charging circuit)
is set to give approximately a 2-ampere charging rate. For
applications requiring frequent starts, check battery specific
gravity periodically and, if necessary, increase the charging
rate slightly (move slide tap nearer ungrounded lead) until
it keeps the battery charged. Adjust only when set is
stopped. Avoid overcharging. The resistor is located in
the generator air outlet.
If a separate automatic demand control for starting and stop-
ping is used, adjust the charge rate for its maximum 4.5
amperes. This normally keeps battery charged even if starts-
occur as often as 15-minutes apart.
Extremes in starting temperatures may require additional
preheating. If engine fails to start quickly, rest engine
several seconds and repeat starting sequence applying
preheat for a longer interval.
r^^TI^rXkr^'? ^
not
WPh overvoltage to the starting
CAUTION J .
FIGURE 14. BLEEDING THE FUEL SYSTEM
I drear t at any time. Overvoltage will
destroy the glow, plugs and air heater in two to three
17

Onan MDJF Series Specifications

General

Brand	Onan
Model	MDJF Series
Category	Inverter
Language	English