Spark Plugs; Battery Inspection; Battery Jump Starting - Onan T260G Service Manual

SPARK PLUGS
Check and regap
spark plugs every 100 hours of
operation (Figure 6). Replace spark plugs that show
signs of fouling or electrode erosion.
BATTERY JUMP STARTING
Occasionally, it may be necessary to jump start(charge)
a weak battery using a charged booster battery. If jump
starting is necessary, the following procedure is recom
mended in order to prevent starter damage, battery
damage and personal injuries.
CAUTION CAUTION
Ionger than 30 seconds without
Do not engage starter for periods
allowing
5
minutes for starter to cool. Starter failure
may result if these guidelines are not followed.
FIGURE 6. SPARK PLUG GAP
BATTERY INSPECTION
Check battery cells with a hydrometer. (Figure 7). The
specific gravity reading should be approximately 1.260
at 77OF (25°C).
If one or more cells are low on water, add distilled water
and recharge. Keep the battery case clean and dry. An
accumulation of moisture will lead to a more rapid
discharge and battery failure.
Keep the battery terminals clean and tight. Push the
cable terminal down flush with or slightly below the top
of the battery post (Figure 8). After making connections,
coat the terminals with a light application of petroleum
jelly or grease to retard corrosion.
Poor contact at the battery cable connections is often a
source of trouble. Make sure battery cables are in good
condition and that contacting surfaces are clean and
tightly connected. Do not reverse battery leads. Use
recommended battery tools when disconnecting leads
to avoid mechanical battery damage.
can cause severe personal injury. Do
Ignition of explosive battery gases
not smoke while servicing batteries.
GRAVITY READING
SPECIFIC
SHOULD BE
1.260 at 77'F (25°C)
FIGURE 7. SPECIFIC GRAVITY TEST
1 .
2.
3.
4.
5.
6.
Disconnect engine load.
Use only a battery of the same voltage (12V) as is
used with your engine.
Attach one end of the positive booster cable (red) to
the positive
terminal of the booster battery.
Attach the other end of the positive cable to the
positive terminal of your engine battery.
attach one end of the negative (-) booster cable
(black) to negative (-) terminal of booster battery.
Attach other end of negative cable to a solid chassis
ground on your engine.
Do not allow the positive and
WARNING
negative cable ends to touch
each other because it will short the battery causing
hazardous arcing, which can cause severe
personal injury.
Jump starting in any other manner may result in
damage to the battery or the electrical system.
Turn ignition switch to ON to start engine.
WARNING
to
Never jump start a frozen battery.
o do so can cause the battery to
explode. Never expose the battery to an open flame
or an electrical spark because a battery generates
highly explosive hydrogen gas.
BATTERY POST
CABLETERMINAL
FIGURE 8. BATTERY CABLE CONNECTION
8-4