Onan MDKBH Series, Service Manual

Page: 27 / 90

4-2
GENERAL INSPECTION
Inspect the genset before the first start of the day
and after every eight hours of operation.
Oil Level
Check engine oil level (p. 4-3).
Exhaust System
WARNING
EXHAUST GAS IS DEADLY! Do not
operate the genset until all exhaust leaks have
been repaired.
Inspect the exhaust system for leaks and loose
hose clamps at the exhaust manifold, exhaust el-
bow, muffler, water separator and hull fittings. Re-
place damaged sections of exhaust hose.
Check that all CO monitors are working properly.
Fuel System
WARNING
Fuel leaks can lead to fire. Repair
leaks immediately. Do not run the genset if it
causes fuel to leak.
Check for leaks at hose, tube and pipe fittings in the
fuel supply and return systems while the genset is
running and while it is stopped. Check flexible fuel
hose for cuts, cracks, abrasions and loose hose
clamps. Make sure fuel lines do not rub against oth-
er parts. Replace worn or damaged fuel line parts
before leaks occur. Replace hose with with USCG
TYPE A1 or ISO 7840-A1 fuel hose.
Prime the fuel system if the genset ran out of fuel.
Coolant Level
Check coolant level in the recovery tank and, if nec-
essary, refill to COLD when the engine is cold or to
HOT when it is at normal running temperature. The
recovery tank is designed to maintain coolant level,
not to fill the system. If the tank is empty, check for
and repair any coolant leaks and refill the system
through the fill neck on the engine. See Refilling the
Cooling System (p. 4-6). Use the recommended
antifreeze mixture (p. 3-2).
Raw Water System
Clean out the sea water strainer if necessary and
make sure the sea cock is open for genset opera-
tion. Also, when a water/exhaust separator is pro-
vided (see Installation Manual), open the sea cock
for the water drain hose.
Check for and replace hoses that leak or are dam-
aged.
Battery Connections
See MAINTAINING THE BATTERY AND BATTERY
CONNECTIONS.
Mechanical
Monitor generator set status using the e- Series Dig-
ital Display (p. 2-3) .
Look for mechanical damage and listen for unusual
noises when the genset is running. Check the gen-
set mounting bolts. Check to see that the genset air
inlet and outlet openings are not clogged with debris
or blocked. Keep the genset compartment clean.
MAINTAINING THE BATTERY AND
BATTERY CONNECTIONS
WARNING
Arcing at battery terminals or in
light switches or other equipment, and flames or
sparks, can ignite battery gas causing severe
personal injury—Ventilate battery area before
working on or near battery—Wear safety
glasses—Do not smoke—Switch work light ON
or OFF away from battery—Stop genset and dis-
connect charger before disconnecting battery
cables—Disconnect negative (–) cable first and
reconnect last.
Refer to Table 4-1 for scheduled battery mainte-
nance, and follow the battery manufacturer’s in-
structions. Have the battery charging system ser-
viced if DC system voltage is consistently low or
high.
Check the battery terminals for clean, tight connec-
tions. Loose or corroded connections have high
electrical resistance which makes starting harder.
Always:
1. Keep the battery case and terminals clean and
dry and the terminals tight.
2. Use a battery terminal puller if the battery has
terminal posts.
3. Make sure which terminal is positive ( + ) and
which is negative ( – ) before making battery
connections, always removing the negative ( – )
cable first and reconnecting it last to reduce
arcing.
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