Cub Cadet BB40 - Manual (Page 14)

14
Maintenance (continued)
Cooling System
To maintain as low of an
operating temperature as
possible, the engine is
equipped with a cooling
system. The cooling sys-
tem consists of:
1. An air intake on the
starter unit.
2. Cooling fins on the
flywheel.
3. Cooling fins on the
cylinder.
4. A cylinder cover that
leads cold air onto the
cylinder.
Using a brush, clean the cooling system at least once
a week. In difficult conditions, clean it more regularly.
Spark Plug
The condition of the spark
plug is affected by:
• An incorrect carburetor
setting
• An incorrect fuel mixture
(too much faulty oil)
• A dirty air filter
These factors can cause
deposits on the spark plug
electrode. This may result
in a malfunction or starting
difficulties.
NOTE: If the unit is low on power, difficult to start,
or runs poorly while idling, always check
the spark plug first.
If the spark plug is dirty, clean it and check that it has
a 0.5 mm electrode gap. Change the spark plug after
one month of operation, or earlier.
NOTE: Always use the recommended type of
spark plug. An incorrect spark plug can
damage the cylinder and piston.
Air Filter
The air filter should be
cleaned regularly to remove
dust and dirt. This will help
avoid:
• Carburetor malfunction
• Problems with starting
• Unnecessary wear to
engine parts.
• Abnormal fuel
consumption
Clean the filter after every 25 hours of operation, or
more regularly if operating conditions are excessively
dusty.
Cleaning the Air Filter
Dismantle the air filter cover and remove the air filter.
Wash the filter in clean, warm soapy water. Ensure
that the filter is dry before you refit it. An air filter that
has been used for a long period of time can never
become completely clean. From time to time, it is
necessary to replace the filter with a new one. You
must always replace a damaged air filter.
If you use your unit in dusty places, you should soak
the air filter in oil.
Oiling the Air Filter
The air filter contains a
solvent that enables the oil
to spread evenly through-
out the filter. Therefore,
avoid skin contact with the
filter.
To apply oil, place the fil-
ter in a plastic bag and
pour the oil over the filter.
Knead the plastic bag to
distribute the oil. Squeeze
any excess oil out of the
filter inside the plastic
bag. Pour off the excess
before you fit the filter into
the unit.
Never use common engine oil. This could drain
through the filter quickly and collect in the bottom.