Onan MCCK - GENERAL

INSTALLATION
GENERAL
Proper installation is very important. Give attention to
the following points: Adequate generator cooling air,
discharge of circulated air, adequate fresh air, adequate
engine cooling water, discharge of circulated water, dis¬
charge of exhaust gases, electrical connections, fuel
connection, sturdy and flat floor and accessibility for
operation and service. Use this manual as a guide to
help with the installation. Refer to Typical Installation,
Figures 1 and2. For more complete instructions, request
Onan Technical Bulletin T-021.
Installations must be considered individually, and ex¬
ecuted in compliance with all regulations which may
affect the installation. The advice and guidance con¬
tained in the booklet, Fire Protection Standard for Motor
Craft: (NFPA No.302) offered by the National Fire Pro¬
tection Association International, Boston 10, Mass¬
achusetts, will be helpful to the installer of equipment
in vessels.
Figure 2. Mounting Dimensions
LOCATION
Select a dry, properly-ventilated location for the plant,
preferably near the main keel, above low-lying vapors
and free from splash from the bilge. Provide accessibility
for minor servicing operations. draining of the crankcase
lubricating oil and the cooling system.
A 2-1/2” clearance around the unit is required to permit
it to rock on its mounts without restraint. Use flexible
exhaust line, fuel line, battery cables, and electrical
wires.
To install cone-type mounting cushions (Fig.3). position
the plant on the drip pan and place the cushions under
the oil base and generator support. Always use cushions
with highest part number (part number is shown on the
cushion) on the generator end. Secure the plant, to the
drip pan with the associated hardware (Fig.3). Add thin
flat washers to maintain approximately 1/16” clearance
between snubber washer and flat washer. Cushion de¬
flection under load should be approximately 3/16”.
CAPSCREW
LOCK WASHER
FLAT WASHER
SNUBBER
GENERATOR OR
OIL BASE MOUNT¬
ING FOOT
CUSHION
MOUNTING SPACER
BUSHING
DRIP PAN
Figure 3. Cone-Type Mounting Cushion
Install two hold-down clamps to the drip pan (front and
rear or both sides). Secure the clamps to the mounting
base.
FUEL TANK AND LINES
If a separate fuel tank is used, install it so the bottom
of the tank will be less than 4 feet below the fuel pump.
To prevent siphoning if a system leak occurs, position
the tank below the level of the engine pump,or use a
siphon break system.
If a fuel tank is shared, do not connect to an existing
line at a point above the fuel supply level. This avoids
starving the plant (See Fig.4 and 5).
MOUNTING
The floor should be flat, and give support directly under
the plant mounting points.
If vertical fuel lift exceeds 4 feet, or vapor lock occurs,
install an auxiliary electric fuel pump near the fuel sup¬
ply-