Onan MDJF Series Operator's Manual And Parts Catalog page 11

The diesel engine requires a fuel supply line and a separate
fuel return line. Install the fuel return line from the 7/T6-24
size opening in the overflow fitting located on the injection
pump (where the nozzle fuel return line is also connected) to
the top of the fuel supply tank (Fig. 5).
Do not use galvanized lines, fittings, or fuel tanks in the
fuel system. Carefully clean all fuel system components
before putting the plant into operation. Any dirt or contam-
ination may cause major damage to the fuei injection system.
OIL DRAIN
The oil drain may be extended to suit the installation. The
oil base has a 1/2" pipe tapped hole.
^SHUT
FUEL
TANK
BELOW F U E L
— F U E L PUMP L E V E L
RETURN
L I N E
PROPULSION
ENGINE
• FUEL
RETURN
LINE
GENcKATOR'
FIGURE 4. F U E L LINE ARRANGEMENT
VENTILATION
The generating set requires fresh air for combustion and
generator cooling. Onan recommends that the ventilation
system be able to deliver 1-1/2 to 2 times the air required
b; the set. When the ventilation system depends on wind
or boat motion, use powered exhausters to provide ventila-
tion when the boat is not in motion. For more information,
refer to Onan Technical Bulletin T-021.
EXHAUST
WARNING
^Pfpe exhaust gases outside of the hull
I - exhaust gases are poisonous!
See Installation, Figures 2 and 3. The engine exhaust
connection is 1-1/2" pipe tapped.
Install a separate exhaust line as follows:
1. Above vessel load water line.
2. Pitched downward to prevent water backflow.
3. Shield line near combustible material.
4. Use flexible hose or tubing.
5. For turns use sweeping (long radius) elbows.
6. Increase one pipe size for every 10 f t . in length.
C O N N E C T
F U E L R E T U R N
LINE HERE
( F l e x i b l e Line)
RETURN
L I N E
Provide a tee for water line connection for wet ex-
haust (Figure 3) - refer to Water Discharge Line
Instructions. Raise the dry portion of the exhaust
line high enough to prevent water backflowing into
the engine under a l l conditions.
The water jacketed exhaust manifold is pipe tapped
at both ends for convenience in exhaust line conn-
ection.
FIGURE 5. F U E L S Y S T E M
AQUALIFT MUFFLER (Optional)
The Aqualift is a highly efficient marine muffler designed for
above or below water line installations when water cooled
exhaust systems are used. Because of installation variables,
customers must provide the brackets, hoses and clamps, re-
quired for installation.
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