Cub Cadet GT 2521 Operator's Manual page 29

CLEANING ENGINE
This tractor has an air-cooled engine. Air must be able
to circulate freely around the engine through the
flywheel screen, through the cooling shrouds and over
the fins of the cylinder head and cylinder block (See
Figure 27). Keep these areas free of accumulated dirt
and debris to keep the engine from overheating and
possibly causing extensive engine damage. Regularly
clean the inside of the side panels, dash intake screen
and grille to ensure adequate cooling. If debris has
accumulated inside the cooling shrouds, the blower
housing and cooling shrouds should be removed and
the cooling fins cleaned.
NOTE
This machine is designed to cool properly with
the side panels in place. Operating without the
panels could cause premature accumulation of
dirt and debris on the engine, resulting in
inadequate cooling.
CLEAN
Figure 27
To assure smooth operation, keep the governor
linkage, springs and controls free of debris (See Figure
28).
Keep the muffler area clean. Before running the
engine, clean the muffler area to remove all
combustible debris. Inspect the muffler area often
when mowing during the Fall season
SPARK PLUG
To avoid possible injury, be sure the engine is
off and has cooled before making any
adjustments or repairs.
Remove all dirt from around the spark plug
before removing. Always use a spark plug
wrench to remove the spark plugs
Check the spark plug gap and clean the plug yearly.
Replace a worn plug with a new plug. Set the spark
plug gap at .030 inch (See Figure 29). Tighten the plug
to 10-15 ft-lbs. See your authorized dealer for the
correct replacement plug.
CLEAN
.030 in. gap
29
CLEAN
Figure 28
CAUTION
WARNING
NOTE
Figure 29